Testosterone Propionate: The Definitive Guide

What is testosterone propionate?

Testosterone propionate is a prescription form of testosterone that is injected into a muscle. It is testosterone with the shortest chemical tail used in medicine for men, dissolved in oil. The tail makes it release more slowly than plain testosterone, but only for a day or two, so it has to be injected every few days. Guidelines now prefer other forms, and few countries still sell it on its own. [1], [2], [3]

The name describes the chemistry. "Propionate" is the three-carbon ester (a chemical tail) joined to testosterone. The body snips the tail off to release ordinary testosterone. Because the tail is small, propionate carries more testosterone per milligram than longer esters: 25 mg of testosterone propionate contains 20.9 mg of testosterone, about 84%, compared with about 70% for cypionate. [1], [4], [5]

It is labeled for men with hypogonadism (low testosterone from a medical cause) that has been confirmed by symptoms and blood tests. The Spanish label adds that low testosterone should be confirmed by two separate blood tests, after other causes of the symptoms are ruled out. [1], [6]

[1], [7], [6], [8], [9], [10], [11], [12], [13], [14]

A little history. Testosterone was first isolated and made in the laboratory in 1935. Propionate was the first injectable form: an official 1937 list of medicines names "Testoviron" (testosterone propionate) from Schering-Kahlbaum in Berlin. The longer-acting enanthate took over from the mid-1950s and remained the main preparation for half a century. Older papers use "depot" names loosely. One gives a "testosterone propionate depot" every 21 days, which is not how plain propionate behaves, so it helps to check which ester and formulation a paper or product actually contains. [15], [16], [17], [18]

People also meet propionate outside medical care, as compounded vials, unlicensed "test prop" or blends with other esters. Those products are not covered by the labels described here, and supraphysiologic (above the natural range) "cycle" doses are not testosterone replacement therapy, or TRT (see TRT vs steroids). [1], [19]

Typical Testosterone Propionate Protocols

Every label and guideline gives propionate as an injection into a muscle every 2 to 4 days, because one dose keeps testosterone raised for only about 1 to 2 days. The two labels' weekly totals are 50 to 100 mg. [1], [6], [3], [2]

Titration Adjusting the dose in steps

The Spanish label lets the patient's clinical response set both the dose and the number of injections. The Italian label asks for the dose to be adjusted for each man to keep testosterone in the normal range. Both ask for testosterone to be measured at the start and at regular intervals. Neither label, and no guideline, says when after a propionate injection blood should be drawn: the guideline rules about mid-cycle or trough draws were written for enanthate and cypionate. For propionate, draw timing is not established. [1], [6], [20], [21] See why timing matters so much.

Breaks and cycles

Not applicable. Testosterone replacement is continuous treatment, and no guideline describes planned breaks. The Italian label's advice to alternate 4-week courses with equal breaks applies only to doses above replacement, not to treating hypogonadism. Stopping is a separate decision (what happens when you stop). [6]

Read the units. Doses are written in milligrams (mg) of testosterone propionate, but you draw a volume, and the volume depends on the strength. Spain's 25 mg dose is the whole 1 mL ampoule. Italy's 50 mg dose is 1 mL, half of the 2 mL ampoule. At 100 mg/mL, the highest strength of the discontinued US vials and the strength of the Canadian vial, 50 mg is 0.5 mL, which is 50 units on a U-100 insulin syringe. The amount each time and the weekly total are different numbers: 25 mg 4 times a week is 100 mg a week. Milligrams also differ between esters: a milligram of propionate carries more testosterone than a milligram of cypionate (see why). Doserly's TRT dose calculator does the arithmetic for any strength and schedule. [1], [6], [22], [14]

These are labeled and guideline doses; prescribers adjust them using blood tests and symptoms. The ranges above are for adult men. For women, see testosterone therapy for women, which uses different products and far smaller doses.

Cautions for every schedule above. The Spanish label rules propionate out in women. In men, it rules it out with prostate cancer or a PSA above 4 ng/mL, an enlarged prostate, past or present liver tumors, male breast cancer, high calcium in the blood or urine, or a hematocrit above 50%. It must go into a muscle slowly and never into a vein. It switches off sperm production (fertility), and hematocrit, blood pressure and PSA (prostate-specific antigen, a prostate blood test) need checking (monitoring). [1]

Where schedules differ: label vs guideline doses, how often to inject, muscle vs fat, and blood-test timing ↓

What is testosterone propionate commonly used for?

Its licensed use is replacing testosterone in men with hypogonadism: either primary hypogonadism, where the testicles fail, or hypogonadotropic hypogonadism, where the brain and pituitary do not send enough signal. The Spanish label says it is not a treatment for infertility, or for sexual problems in men without a proven testosterone deficiency. [1], [6]

What does testosterone replacement improve?

The benefits are those of testosterone itself, whatever the ester. In trials, testosterone for low testosterone mainly improves sexual desire and activity. In the TRAVERSE trial's men with low libido, sexual activity rose by about half an act a day more than on placebo, but erections did not improve. In the Testosterone Trials of men 65 and older, a year of gel improved sexual function a little but not energy or walking in the physical function trial. No trial has measured these outcomes with propionate itself. [25], [26] See the results timeline guide and TRT: the definitive guide.

How long does testosterone propionate take to work?

Blood levels rise within hours. In healthy men given 25 mg, the ester was already in the blood 3 hours later and stayed there for about a day and a half. Symptoms change more slowly and on the same timeline as other forms of testosterone. A widely cited review found sexual interest improving after about 3 weeks, erections over up to 6 months and body composition over 12 to 16 weeks. [27], [28]

Why is propionate rarely used for TRT today?

Mainly because of how often it has to be injected. The European urology guideline says propionate needs "multiple fractionated doses (usually 50mg, every two to three days), thus representing a major limitation for its use." The European urology guideline and the European Academy of Andrology both say older injections such as propionate cause wide swings in testosterone. They add that these may bring more red-cell rises. The Italian andrology guideline also notes wider swings with short-acting injections and prefers gels or long-acting injections. The British Society for Sexual Medicine lists propionate only as one of the four esters in Sustanon 250. [3], [23], [29], [30]

Availability adds to it. In the United States and Canada no propionate medicine is marketed, so a prescriber who wants it must use a compounding pharmacy (in the US) or look abroad. [22], [13], [14]

Where do testosterone propionate protocols differ?

The disagreements are about how much, how often, where to inject and when to draw blood. Most come from how little propionate-specific research exists.

Is the dose from a label or a guideline?

The two labels agree on 50 to 100 mg a week; the European guideline's text implies more, and its summary table far more. The Spanish label gives 50 to 100 mg a week and the Italian label 100 mg a week. The European urology guideline's text says usually 50 mg every 2 to 3 days, which averages about 117 to 175 mg a week. Its summary table, like the Italian andrology guideline's table, lists 100 mg every 2 days, about 350 mg a week. That is 3.5 to 7 times the labels' weekly totals and 2 to 3 times the guideline's own text. This guide shows the text value in the protocol table and leaves the table value out. [1], [6], [3], [23]

How often should it be injected?

The labels say 2 to 4 times a week and the guideline every 2 to 3 days, all because one dose wears off within 1 to 2 days. Online, many men describe daily or every-other-day injections of 10 to 25 mg, often subcutaneous (into the fat). No guideline or peer-reviewed practice source gives a complete schedule for those patterns, and no study has compared daily with every-2-to-3-day propionate. [1], [3], [2] What people report is in the community section.

Into muscle or into the fat?

Both current propionate labels say into a muscle only: Spain's specifies deep in the buttock, injected very slowly. No human study has measured propionate levels, comfort or safety after subcutaneous injection (into the fatty layer under the skin), and no registered trial is testing it. [1], [31]

The evidence for weekly subcutaneous testosterone comes from enanthate and cypionate. The UK Society for Endocrinology accepts that route for those two esters, but that does not show how a short, fast-releasing ester behaves as a subcutaneous injection. Injection technique is covered in how to inject testosterone. [21]

When should blood be drawn?

No label or guideline says, and on propionate the timing changes the result more than on any other testosterone injection. Guidelines disagree even for longer esters: some judge injections by a level midway between doses, others by the trough (the lowest level, just before the next dose). With propionate, both points fall within a day or two of the injection. So a level drawn a few hours after a dose and one drawn just before the next can describe the same schedule very differently. [20], [21], [2]

[20], [21], [1], [6]

Whatever timing a prescriber uses, recording the date and time of the last injection with every result makes results comparable. See TRT blood work for the full picture.

Is propionate "short-acting"?

It depends on who is talking. The European urology guideline calls propionate, cypionate and enanthate all "short-term" formulations, and the Italian guideline calls propionate "very short-acting." A 2023 urology review instead calls every injection into a muscle "long-acting" and keeps "short-acting" for nasal, oral and skin products. That matters because statements that "short-acting testosterone" affects fertility less are about nasal, oral and skin products, not propionate injections. [3], [23], [32]

What happens when you stop testosterone propionate?

The drug is gone within days; your own hormone production takes much longer to return.

• The last injection. After a single 25 or 50 mg dose, levels fell back within 1 to 2 days, and the pituitary's signal to the testicles, luteinizing hormone (LH), stayed suppressed only while testosterone stayed raised. [2]
• Your own testosterone. After weeks or years of treatment, recovery of LH, FSH (follicle-stimulating hormone) and your own testosterone depends on the cause of low testosterone and how long treatment lasted. No study shows that recovery is faster after propionate than after longer esters, and in men with a lasting cause of hypogonadism, low testosterone is expected to return. [2], [21]
• Sperm. In contraceptive trials of healthy men given testosterone alone or with a progestin, sperm counts returned to 20 million per mL in 67% within 6 months, 90% within 12 months and 100% within 24 months. That pooled analysis linked shorter-acting testosterone preparations with faster recovery, though not more complete recovery; its abstract does not name propionate. The Spanish label describes the effect on sperm production as reversible. [33], [1]

See stopping TRT for the full picture, including fertility recovery and what men describe.

How does testosterone propionate compare with other forms?

It is the shortest-acting injectable ester used for men. Compared with cypionate or enanthate, one dose lasts days rather than a week or more, so it needs several injections a week, and levels rise and fall within each few days. [2], [3]

How long does testosterone propionate last in the body?

About 1 to 2 days per dose. In a 1976 study of healthy men and men with hypogonadism, testosterone stayed above the lower physiological limit for 1 day after 25 mg of propionate and 2 days after 50 mg. After 250 mg of enanthate it stayed above that limit for 14 days. LH was suppressed for the same periods. [2]

Two small Japanese studies used a tracer-tagged (deuterium-labelled) dose, so testosterone from the injection could be told apart from the body's own. In healthy men given 25 mg, testosterone from the dose stayed above the normal level for 48 hours. In three men with hypogonadotropic hypogonadism, one dose (the amount is not given in the abstract) kept it above 400 ng/dL (about 14 nmol/L) for 48 hours. [27], [34]

One older study found a longer effect. In 28 men over 60, one 100 mg dose of a product labelled testosterone propionate kept testosterone above their starting levels through day 7, and levels were back to baseline by day 15. Blood was drawn only on days 2, 4, 7 and 15, and the abstract does not describe the formulation; its title calls it depot testosterone. The dose was 2 to 4 times the 25 and 50 mg doses above, and it measured a rise above each man's own starting level rather than above the normal limit. This guide follows the 1 to 2 day figure, which the other studies and the labels' dosing agree on. [35]

Its half-life is quoted in different ways. The European and Italian guideline tables list 20 hours without naming the study behind it, and the Italian label claims one injection works for about 4 weeks, which the human measurements above contradict. Testosterone itself has a half-life of only 10 to 100 minutes once it reaches the blood; the Spanish label explains that an ester's absorption rate depends on the size of its tail, and propionate's is the smallest in use. So the ester, not testosterone, sets the dosing interval. [3], [23], [6], [1]

Doserly

How long one dose lasts, and how often it is given

Days above the lower normal limit after one injection

Nieschlag 1976: healthy men and men with hypogonadism; group sizes not given.

Propionate 25 mg

About 1 day

Propionate 50 mg

About 2 days

Enanthate 250 mg

About 14 days

Separate study (Fujioka 1986)

In healthy men given one tracer-tagged 25 mg dose, testosterone from the dose stayed above the normal level for 48 hours.

Labeled schedules across one week

Each dot is one injection on days 1 to 7. Days are illustrative; labels give how often, not which days. Schedules only, not blood levels.

Spain label: 25 mg, 2 times a week

50 mg a week

Spain label: 25 mg, 4 times a week

100 mg a week

Italy label: 50 mg, twice a week

100 mg a week

European urology guideline (text): 50 mg every 2 to 3 days

About 117–175 mg a week on average. Filled dots: every 2 days; hollow dots: every 3 days.

One dose wears off within 1 to 2 days, so every labeled schedule gives propionate at least twice a week.

What do the peaks and troughs look like?

No openly readable study charts levels across repeated propionate doses. Guidelines agree on the pattern: the older injectable esters, propionate included, produce wide swings in testosterone that patients often find unpleasant, and possibly more red-cell rises. One older study in men with alcohol-related liver cirrhosis found fairly steady levels after 4 days of every-other-day propionate. No study has compared daily with every-2-to-3-day injections. [3], [29], [23], [36]

Doserly's testosterone level visualizer can draw a rough, relative propionate curve for any schedule. It uses the guideline's 20-hour half-life and an assumed time to peak, so treat it as an illustration, not a prediction.

Is propionate stronger than cypionate mg for mg?

Yes, by about a fifth, because its tail is lighter. Testosterone makes up about 84% of testosterone propionate by weight, compared with about 72% of enanthate, 70% of cypionate and 63% of undecanoate. So 100 mg of propionate carries about 84 mg of testosterone, and 100 mg of cypionate about 70 mg. [4], [1]

Doserly

How much testosterone is in each ester

TestosteroneEster tail (removed in the body)

100 mg testosterone propionate

About 84 mg testosterone

100 mg testosterone enanthate

About 72 mg testosterone

100 mg testosterone cypionate

About 70 mg testosterone

100 mg testosterone undecanoate

About 63 mg testosterone

Ester	Molecular weight	Testosterone share
Propionate	344.5 g/mol	83.7%
Enanthate	400.6 g/mol	72.0%
Cypionate	412.6 g/mol	69.9%
Undecanoate	456.7 g/mol	63.1%
Testosterone itself	288.4 g/mol	100%

The Spanish label gives the same ratio: 25 mg of testosterone propionate contains 20.9 mg of testosterone. A higher share does not make one ester better; it means milligrams cannot be swapped one for one.

That is why switching between esters is a prescriber's decision rather than a straight swap. The US cypionate label warns that cypionate "should not be used interchangeably with testosterone propionate because of differences in duration of action." A switch changes the amount of testosterone, how often it is injected and when blood should be drawn. [5]

Is testosterone propionate the same as Sustanon 250?

No. Sustanon 250 contains propionate as one of four esters: 30 mg of propionate, 60 mg of phenylpropionate, 60 mg of isocaproate and 100 mg of decanoate in each 1 mL. The propionate gives a fast start, and the longer esters let one injection usually last 3 weeks. Levels peak at about 70 nmol/L (about 2,020 ng/dL) 24 to 48 hours after the injection and return to the lower normal limit in about 21 days. See the Sustanon 250 guide. [9], [11]

What about cypionate-propionate blends?

Blends are made by compounding pharmacies, not sold as approved medicines in the United States. An FDA warning letter to one outsourcing facility records a compounded "Testosterone cypionate/ Testosterone propionate 200mg/10mg Injection," and mixed enanthate and propionate products have been used as TRT in other countries. No study has tested a blend's levels, benefits or safety. [19], [37]

What is in the ampoule?

Testosterone propionate dissolved in oil. The Spanish product uses ethyl oleate and olive oil; the Italian product uses sesame oil, and its label warns that sesame oil can rarely cause severe allergic reactions. The US pharmacopeia standard describes the injection as a sterile solution in "a suitable vegetable oil," so compounded products can use different oils. [1], [6], [38]

Does testosterone propionate hurt more than other injections?

No study has compared injection pain between esters, so the reputation rests on personal accounts. The Italian label lists a firm swelling at the injection site and boils with injections into muscle, and the Spanish label lists no injection-site reaction. A general caution applies to all oil injections: a case report describes oil-filled lumps (oleomas) forming years after unsupervised testosterone-in-oil injections, with the ester not identified. [6], [1], [39] What people report is in the community section.

Can oil injections cause a cough?

Rarely. The Spanish label warns that oil can reach the lungs as tiny droplets (pulmonary oil microembolism), causing cough, shortness of breath, sweating, chest pain, dizziness, tingling or fainting during or just after the injection. These reactions are reversible, and the label asks for the patient to be watched during and just after each injection. [1]

How should testosterone propionate be stored?

Neither label asks for refrigeration. Each product's leaflet is the final word. [1], [6]

[1], [6]

Compounded vials come with the pharmacy's own storage and discard dates. For carrying ampoules or vials on a trip, see traveling with testosterone. This guide does not teach injection technique; the Academy note below covers the practical basics, and how to inject testosterone covers sites and needles.

What does testosterone propionate do to fertility, estrogen and red blood cells?

These three effects come with every form of testosterone; each has its own hub guide. Here is what is specific to propionate.

Fertility. Propionate switches off LH for as long as its levels are raised, and the labels warn that testosterone reduces sperm production. No human study has measured propionate's effect on sperm. The claim that it "spares" fertility rests on one mouse study, in which normal (not hypogonadal) mice were given propionate into the abdomen three times a week and reached lower testosterone levels than mice given pellets (122 vs 286 ng/dL). The US male infertility guideline advises against testosterone for men who want children now or in the future, and the European urology guideline advises against it for men wishing to become fathers. See TRT and fertility. [2], [1], [31], [40], [41], [3]

Estrogen. Some testosterone is converted into estradiol, and the Spanish label lists breast enlargement (gynecomastia) among possible effects. No study shows that propionate, or injecting it more often, lowers estradiol. No guideline sets a routine estradiol target: the AUA measures it mainly when breast symptoms appear. See estrogen on TRT. [1], [42]

Red blood cells. The Spanish label lists a rise in red blood cells (polycythemia), hematocrit and hemoglobin as common, affecting between 1 in 100 and 1 in 10 people, and rules propionate out when hematocrit is above 50%. European guidelines link the swings of older injections with possibly more red-cell rises. No trial has tested whether small, frequent propionate doses raise hematocrit less. The nearest evidence is observational: hematocrit passed 54% in 1 of 102 men on 100 mg weekly and 4 of 51 on 200 mg every 2 weeks, with the ester not stated. See hematocrit on TRT. [1], [29], [3], [43]

What do we actually know about testosterone propionate in people?

That it raises testosterone for a day or two after each injection is well measured. Almost everything else about it, from long-term safety to fertility, comes from studies of other forms of testosterone.

Which studies used propionate itself?

A search of ClinicalTrials.gov found no registered trial of propionate for low testosterone. [31]

What did the large trials of other forms find?

• TRAVERSE (about 5,200 men, daily gel, used for 21.7 months on average; about 61% stopped early): heart attack, stroke or heart death occurred in 7.0% vs 7.3% on placebo, which met the trial's safety margin. Heart-rhythm, kidney, clot and fracture events were more common (full results). In substudies it did not stop prediabetes turning into diabetes, and it did not treat low-grade persistent depression. [45], [46], [47], [48]
• Testosterone Trials (790 men aged 65 or older, gel for 1 year): small gains in sexual function and mood; no gain in energy or walking in the physical function trial. [26]

Whether those results transfer to propionate is not known. Its fast peaks and troughs are unlike a daily gel, and European guidelines flag possibly more red-cell rises with older injections. [3], [29]

How does testosterone propionate work?

Once injected, the oil forms a small depot in the muscle. The ester moves out of the oil into the blood, where it is broken down to free testosterone. Propionate's small tail lets it leave the depot quickly, so the depot is used up within a day or two. [1], [49]

Testosterone then acts like the body's own hormone. In many tissues it works after being converted to dihydrotestosterone (DHT), and some is converted to estradiol. In the blood, about 98% is bound to proteins such as sex hormone-binding globulin and albumin, and only about 2% is free. [1]

Why it switches off your own production. The brain senses testosterone from any source. When levels rise, the pituitary lowers its LH signal to the testicles; after propionate, LH stayed suppressed for as long as testosterone stayed raised. Without LH the testicles make little testosterone, and sperm production falls. [2], [1]

Why it raises red blood cells. Testosterone acts on the bone marrow, and the Spanish label lists blood formation among the processes it drives. The size of the rise with propionate has not been measured. [1]

What are the risks and unanswered questions?

Is testosterone propionate safe?

For men with a confirmed diagnosis and regular monitoring, it carries the known risks of testosterone: more red blood cells, blood clots, higher blood pressure, fluid retention, breast enlargement, prostate effects and loss of fertility. What is uncertain is everything specific to propionate: no modern trial has measured its long-term safety, and the largest safety trial used a gel. [1], [45]

What side effects do the labels list?

The Spanish label, the most recent propionate label, lists these by how often they occur:

• Common (between 1 in 100 and 1 in 10): a rise in red blood cells, hematocrit and hemoglobin; weight gain; and worsening high blood pressure.
• Uncommon (between 1 in 1,000 and 1 in 100): allergic reactions, higher triglycerides and cholesterol, more appetite, headache, nervousness, aggression, irritability, depression, hot flushes, sleep apnea, diarrhea, nausea and changes in liver tests.
• Rare (between 1 in 10,000 and 1 in 1,000): pulmonary oil microembolism.
• Also listed: acne, a rise in PSA and prostate enlargement; oily skin, hair loss and itching; muscle cramps; urinary problems; changes in libido; more frequent or prolonged erections (priapism); breast enlargement and tenderness; smaller testicles at high doses; and fluid and salt retention.

[1]

The Italian label also lists hives, a firm swelling at the injection site and boils with injections into muscle. The Spanish label adds that irritability, nervousness and weight gain can be signs of too much testosterone that call for a lower dose. [6], [1]

Does testosterone propionate affect the heart?

No heart-outcome trial has used propionate. The best evidence on testosterone and the heart comes from TRAVERSE, a randomized trial of about 5,200 men aged 45 to 80 with heart disease or high heart risk, given daily testosterone gel or a placebo gel. Among the 2,596 men who used testosterone gel and the 2,602 who used placebo gel, it found:

• Heart attack, stroke or heart death: 182 men (7.0%) on testosterone vs 190 (7.3%) on placebo; hazard ratio 0.96, with a 95% confidence interval of 0.78 to 1.17. The top of that range stayed below the trial's safety margin of 1.5, so a large rise in risk was ruled out. [45]
• Heart rhythm: atrial fibrillation 3.5% vs 2.4%; nonfatal rhythm problems needing treatment 5.2% vs 3.3%. [46]
• Kidneys: acute kidney injury 2.3% vs 1.5%. [46]
• Clots: venous clots 1.7% vs 1.2%, including pulmonary embolism 0.9% vs 0.5%. [46]
• Fractures: 91 of 2,601 men (3.50%) vs 64 of 2,603 (2.46%), counting every randomized man. [50]
• Blood pressure: systolic pressure rose 1.0 mm Hg on testosterone and fell 0.5 mm Hg on placebo by 36 months. [46]

Doserly

TRAVERSE: absolute results

Testosterone gel (2,596 men)Placebo gel (2,602 men)

Heart attack, stroke or heart death

Testosterone 7.0% vs placebo 7.3% (182 vs 190 men; hazard ratio 0.96, 95% CI 0.78–1.17; met the 1.5 safety margin)

Nonfatal rhythm problems needing treatment

Testosterone 5.2% vs placebo 3.3%

Atrial fibrillation

Testosterone 3.5% vs placebo 2.4%

Clinical fracture

Testosterone 3.5% vs placebo 2.5% (91 of 2,601 vs 64 of 2,603 in the full analysis set)

Acute kidney injury

Testosterone 2.3% vs placebo 1.5%

Venous clots (all)

Testosterone 1.7% vs placebo 1.2%

Pulmonary embolism

Testosterone 0.9% vs placebo 0.5%

About 5,200 men aged 45–80 at high heart risk; daily gel; mean treatment 21.7 months; about 61% stopped their study gel. Not a trial of injections.

Its limits matter for propionate. TRAVERSE tested only a gel, the average man used it for 21.7 months, about 61% stopped their study gel early, and it enrolled men at high heart risk. It did not test the sharp peaks of short injections. [45], [46]

The Spanish label adds that in men with severe heart, liver or kidney disease, testosterone can cause serious fluid retention with or without heart failure, in which case treatment must stop at once. [1] See TRT and heart health for the full picture.

Could testosterone propionate affect the prostate?

Testosterone can enlarge the prostate and raise PSA slightly. The Spanish label rules propionate out with prostate cancer or a PSA above 4 ng/mL and with an enlarged prostate, and asks for yearly prostate checks. TRAVERSE excluded men with a PSA above 3.0 ng/mL. In the trial, PSA rose about 0.15 ng/mL more than on placebo at 12 months. High-grade prostate cancer occurred in 5 of 2,596 men on testosterone (0.19%) vs 3 of 2,602 on placebo (0.12%), a difference that was not significant. [1], [51] See TRT and the prostate.

Is testosterone propionate legal? Is it FDA approved?

Checked September 2026. Rules differ by country and change often.

United States. No FDA-approved testosterone propionate product is marketed. The key points:

• Approval history. All 9 propionate applications in FDA's database are listed as discontinued, and the brand-name Perandren Propionate Injection was withdrawn at its maker's request in 1986. DailyMed holds no current human propionate label. [22], [52], [24]
• Controlled substance. Testosterone and its esters are Schedule III anabolic steroids, and testosterone is named in the law itself. [53], [54]
• Compounding. Pharmacies may compound from bulk ingredients that meet a US pharmacopeia standard, and one exists for propionate. Every current US drug listing for propionate is Schedule III bulk powder, several marked for prescription compounding. For larger outsourcing facilities, FDA still lists propionate as under evaluation. Compounded products are not FDA-approved, and the AUA advises commercially made testosterone over compounded products when possible. [55], [56], [13], [57], [42]
• Label changes. FDA's February 2025 class-wide label changes and its June 18, 2026 requests (still requests, not yet in any label) apply to approved testosterone products; no current propionate label exists for them to change. [58], [59]
• Telehealth. Temporary rules let clinicians prescribe controlled medicines such as testosterone without an in-person visit through December 31, 2026; a permanent Drug Enforcement Administration (DEA) special-registration rule is still under review. [60], [61]

Canada. Testosterone is a Schedule IV controlled substance. No human propionate product is marketed: StériMax's 100 mg/mL injection has been dormant since August 3, 2017, Taro's product was cancelled in 2001 and Malogen in Oil in 1999. [62], [14], [63]

United Kingdom. Testosterone is a Class C controlled drug (Schedule 4 Part II), prescription-only. The only UK medicine with current product information that contains propionate is Sustanon 250. [64], [10]

Australia. Testosterone is a Schedule 4 (prescription-only) medicine with extra controls on possession. Among current product information documents, propionate appears only in Sustanon 250. [65], [66]

European Union. Rules and products are national. Spain markets Testex as a prescription medicine, and Italy markets Testovis, fully reimbursed on a restricted specialist prescription; other member states were not checked for this guide. [7], [8] See TRT in Europe.

A research use only label on a vial does not make it legal, tested or the same as a licensed product.

Is testosterone propionate banned in sport? Does it show up on a drug test?

Yes. Testosterone and its esters are on the World Anti-Doping Agency (WADA) Prohibited List in class S1, banned in and out of competition, and the 2027 list keeps that from January 1, 2027. The Spanish label warns that it can cause a positive doping test, and Italy's medicines register flags Testovis as banned in and out of competition. Athletes with a medical need can apply for a therapeutic use exemption, which WADA grants only when low testosterone has an organic cause, such as a testicular or pituitary disorder, not for age, obesity or earlier steroid use. [67], [68], [1], [8], [69]

No source gives a detection window for propionate, so there is no reliable clearance time to plan around.

Who should be especially cautious?

• Men who want children now or soon. Testosterone suppresses sperm production; guidelines advise against it for men trying to conceive. [41], [3]
• Men with prostate or breast cancer, an enlarged prostate or a PSA above 4 ng/mL. Ruled out on the Spanish label. [1]
• High hematocrit. The Spanish label rules it out above 50%. [1]
• High calcium. The Spanish label rules it out with high calcium in the blood or urine (hypercalcemia or hypercalciuria). In men with cancer that has spread to bone, it asks for regular calcium checks. [1]
• Heart, kidney or liver disease, or high blood pressure. Fluid retention and blood-pressure rises can worsen these. [1]
• Epilepsy, migraine or diabetes. The Spanish label asks for caution because fluid retention can worsen epilepsy and migraine, and testosterone can lower blood sugar. [1]
• A history of clots, a clotting disorder or sleep apnea. The Spanish label cites reports of clots in the legs, lungs and eyes during testosterone treatment, and of worsening sleep apnea, especially with obesity or lung disease. Leg pain or swelling, or sudden shortness of breath, need urgent assessment. [1]
• Men over 65. Both labels note limited experience in this age group. [1], [6]
• Women and children. It is contraindicated in women and in pregnancy, and the Spanish label is for men over 18 only; these guides are for men. [1]
• Drug-tested athletes. Banned at all times. [67]
• People taking other medicines; see the next question.

Can testosterone propionate be taken with other medicines?

No interaction studies have been done with propionate itself. The Spanish label lists these:

• Blood thinners (oral anticoagulants such as warfarin). Testosterone can increase their effect; the label advises closer checks of blood-clotting tests (INR and prothrombin time), especially when starting and stopping testosterone.
• Insulin and diabetes medicines. Testosterone can improve glucose tolerance and lower the need for them.
• SGLT-2 inhibitors (a type of diabetes medicine). Taking them together has been linked with a higher risk of too many red blood cells; the label advises checking hematocrit and hemoglobin.
• Corticosteroids or ACTH. Together they can increase fluid retention.
• Ciclosporin, levothyroxine and paclitaxel. Testosterone can increase their effects or exposure.
• Enzyme-inducing medicines such as carbamazepine, phenytoin and phenobarbital, which can change testosterone levels.

[1]

Testosterone can also lower thyroxine-binding globulin, which changes total thyroid hormone results without changing thyroid function. Bring a full list of everything you take, including supplements, to a pharmacist or doctor. [1]

Is testosterone propionate still available, and what does it cost?

Checked September 2026.

It depends on the country. It is marketed in Spain and Italy, where Italy's national health service fully reimburses it on a specialist prescription. In the UK and Australia it is available only inside Sustanon 250. In the United States and Canada no propionate medicine is marketed, and in the United States it comes only from compounding pharmacies, at prices set by each pharmacy; no official price exists. [7], [8], [10], [66], [22], [14]

No longer sold: US and Canadian propionate injections

• United States. The brand-name Perandren Propionate Injection (Ciba-Geigy, application NDA 7-029) was withdrawn as no longer marketed, effective November 10, 1986. Generic propionate injections of 25, 50 and 100 mg/mL from several makers are all listed as discontinued. [52], [22]
• Canada. StériMax's 100 mg/mL injection has been dormant (not marketed) since August 3, 2017. Taro's product was cancelled on August 21, 2001, and Malogen in Oil on April 14, 1999. [14], [63]
• A trace in a current label. The US Testopel pellet label still sets its dose in propionate terms: two 75 mg pellets for each 25 mg of testosterone propionate needed each week. [70]

What should be monitored while using testosterone propionate?

The propionate labels give their own schedules, and guidelines add the numbers. Use this summary to prepare questions for your prescriber; it is not a personal testing plan. [1], [6]

[6], [1], [71], [42], [72], [21]

The European urology guideline acts on hematocrit above 54%, and the Canadian Urological Association uses 55%. Apart from the Spanish label's 50% starting limit, numeric limits come from guidelines; US labels say only to stop if hematocrit is "elevated." [3], [73], [74] See TRT blood work and hematocrit on TRT.

Write down the timing. For every testosterone result, note the date and hour of the last injection and the dose. On propionate, a result without its timing is close to impossible to interpret.

What do people in public communities report?

Most men describing propionate online were not using a licensed propionate medicine. Many managed their own treatment with products bought online or from unlicensed labs; a few used pharmacy-compounded vials or European ampoules. The accounts below come from public Reddit threads posted since September 2025 and are described without identifying anyone. Threads about steroid cycles, a large share of propionate discussion, are left out.

Why do people look for propionate, and can they get it?

Most hope it will fix something a longer ester did not, usually a low sex drive, a "flat" mood or bloating. Getting it through a prescriber is hard. One endocrinologist willing to prescribe it could find it only as a powder in his prescribing system, which matches the US listings for bulk powder only. Another man's clinic lost its supply, and a third man's compounding pharmacy stopped making it and offered a cypionate-propionate mix instead. A 55-year-old in Germany, injecting 20 mg every morning without a prescription, asked where European pharmacies sell it. [75], [13], [76], [77], [78]

What do the positive reports look like?

Better sex drive is the most common good news, often described as fast. A man in his 30s whose testosterone had been lowered by methadone for chronic pain had lost interest in sex on cypionate, Sustanon and enanthate. On 10 mg of propionate a day, bought online, then 20 mg, he said his libido improved by the next day; injection pain was mild, but hard lumps made fresh sites hard to find. [79]

A man who had managed his own treatment for about 26 months settled on 18 mg every night, injected shallowly into a muscle, and no longer needed an erectile-dysfunction medicine. A test drawn about 13 hours after a dose read 29.7 nmol/L (about 857 ng/dL), with estradiol at 159 pmol/L (about 43 pg/mL); he called both "high normalish" and planned a lower dose. He also takes thyroid hormone. [80]

A 27-year-old whose testosterone was 263 ng/dL (about 9.1 nmol/L) before treatment, possibly after earlier steroid use, described a much higher sex drive on 30 mg every 3 days. He was also exercising more. Daily or every-other-day injections had brought more of the migraines he already had. Another man felt less bloated and hungry than on cypionate or enanthate, without giving doses or tests; replies described both similar and opposite experiences. [81], [82]

Does everyone respond?

No. One man tried 6, 8 and 11 mg a day alongside hCG and DHEA; each felt strong for a few days, then lukewarm, and some injections were followed by anxiety. He went back to cypionate, and replies pointed out that three things had changed at once. Another man, after 5 years of cypionate with brain fog and irritability, switched to 12 mg of propionate a day, matched to his old dose by testosterone content. Two weeks in he felt calmer and clearer but weaker in the gym, with cypionate still clearing from his body. [83], [84]

How often, and at what time, do people inject?

Most describe 10 to 25 mg once a day or every other day, smaller and more often than the labeled 25 mg 2 to 4 times a week; no study has tested these schedules. One man, using an unlicensed product, felt tired and low the day after each 75 mg every-other-day injection and had more energy on 37 mg daily. Either way that is about 260 mg a week, over twice the labels' highest weekly total. Another described better morning drive on 18 mg of subcutaneous propionate every 48 hours, while a reply said 20 mg every 2 days did nothing. [85], [86]

Time of day comes up constantly, mostly because of sleep:

• Night. A man on 15 mg every night later said night injections made his sleep worse. Another, trying 12 to 17.5 mg at different times, woke at 3 a.m. with what he called an adrenaline surge, then had morning headaches; one reply suggested checking his blood pressure. [87], [88]
• Morning. A man on 10 mg each morning felt more energy but lay awake at bedtime, jittery, with occasional headaches. [89]
• Evening. A man taking 120 mg a week as daily evening injections felt his energy fall in the hours before each next dose. [90]
• Prescribed. An endocrinologist switched one man from every-other-day enanthate to daily propionate. After his first late-night dose he woke more easily and had no pain, and he said himself that it might be coincidence. [91]

Does propionate hurt more?

Injection pain is the most common complaint in these threads, and experiences range from none to severe:

• Pain that stopped treatment. A man on pharmacy-compounded 100 mg/mL propionate felt best on it, but his injection sites throbbed within 1 to 2 weeks every time. Replies argued that his half-inch needle was not reaching the muscle. [92]
• Subcutaneous, then into muscle. A first subcutaneous dose hurt too much to finish; daily injections into muscle then left one man's buttocks and thighs so sore that walking hurt, and he went back to longer esters. [93]
• A lump that needed a doctor. After a first thigh injection of an unlicensed product, one man developed a large, hard, red lump. An urgent-care clinician found no staph infection and gave antibiotics to use only if it did not improve. [94]
• Burning or a blend. One man described burning so severe he sometimes could not finish the dose; another had deep, bruise-like thigh pain after each dose of a compounded cypionate-propionate vial (160 and 40 mg/mL), unlike his usual cypionate. [95], [96]
• No pain at all. A man had none two hours after his first 30 mg subcutaneous dose; several replies said they never have pain with propionate, while others said it can appear the next day. [97]

Why do blood results confuse people?

Because the level moves within hours. After 7 days of 15 mg nightly, one man's total testosterone read about 1,550 (units not given), with LH below 1, meaning his own production was already switched off. Another, taking 200 mg a week (twice the Spanish label's top weekly total), had a hematocrit of 53% after two months, drawn an hour before his next injection. [87], [98]

Stopping shows the same speed. A man on 70 mg a week stopped for blood tests needed to move his prescription to his own doctor. Eight days after his last dose his total testosterone was 20 ng/dL (about 0.7 nmol/L), against 334 ng/dL (about 11.6 nmol/L) before he ever started treatment; a second test at his doctor's office read 91 (units not given). He felt very tired but "not horrible." [99] A result taken days after stopping reflects a system that is still switched off, not the level a man had before treatment. [2]

What do people say about blends and switching?

• Hematocrit on a blend. A man on TRT for over 20 years switched to a daily mix of two parts cypionate to one part propionate, injected subcutaneously. He said it brought his hematocrit from about 52 to 54% down to 47 to 49% across four tests. He had also cut his dose by 10 to 20%, and replies argued that hematocrit follows total exposure rather than the ester. [100]
• A prescribed blend. A man whose Sustanon 250 effects faded before each 3-weekly dose was switched by his prescriber to 135 mg of an enanthate-propionate blend (110 mg and 25 mg) every 10 days. He had only just taken the first dose when he updated the thread. [101]
• Switching away. A man in Germany moved from self-managed propionate, 15 mg subcutaneously each day (105 mg a week), to clinician-supervised enanthate twice a week at about 125 mg, which he calculated as the same amount of testosterone. Three weeks later his libido and morning erections were much lower, though his mood was unchanged. He also takes dutasteride and had just tried exemestane, an aromatase inhibitor. [102]

What unwanted effects come up?

• Anxiety. A man in his 20s, who had taken a small dose of anastrozole days before, had repeated bouts of anxiety, tension and dizziness on the second day of daily subcutaneous propionate. [103]
• Breast soreness. A man on 10 mg a day had a sore nipple with a small lump. Anastrozole and tamoxifen did not help; his blood was drawn 10 minutes after waking and after a workout, which replies said can raise prolactin. His doctor later found normal results, but the soreness remained. [104]

How can you judge a propionate story?

Ask: Was it a licensed medicine, a compounded vial or an unlicensed product, and at what strength (mg/mL)? What was the dose in mg, how often, and into muscle or subcutaneously (into the fat)? How many hours after the last injection was blood drawn? What else changed at the same time, such as hCG, an aromatase inhibitor, DHEA, a weight-loss medicine or a longer ester still clearing? What happened a few months later?

These selected discussions show what people experience and the questions research should answer. They are not a survey of all users, a success rate or a substitute for the studies.

How does testosterone propionate compare with other testosterone forms?

These are the forms most often weighed against propionate. Status was checked in September 2026.

No trial ranks these forms on long-term outcomes. The practical differences are how often you dose, how much levels swing and how much hematocrit rises. See cypionate vs enanthate for the most common injectable comparison.

Common questions about testosterone propionate

How often do you inject testosterone propionate?

Every 2 to 4 days on the labels: 2 to 4 times a week in Spain, twice a week in Italy, and every 2 to 3 days in the European urology guideline. One dose keeps testosterone raised for only about 1 to 2 days, which is why it is injected so often. [1], [6], [3], [2] See typical protocols.

How much testosterone propionate is given per week?

The labels give 50 to 100 mg a week (Spain) and 100 mg a week (Italy), split into 2 to 4 injections. The European guideline's text of 50 mg every 2 to 3 days works out to about 117 to 175 mg a week. The prescriber adjusts the dose with blood tests and symptoms. [1], [6], [3] See where protocols differ.

How many units is 50 mg of testosterone propionate?

At 100 mg/mL, 50 mg is 0.5 mL, which is 50 units on a U-100 insulin syringe. At 50 mg/mL (the Italian ampoule), 50 mg is 1 mL. Units on an insulin syringe measure volume, so the answer always depends on the strength printed on your ampoule or vial. [6], [14] Doserly's TRT dose calculator shows each step.

Can testosterone propionate be injected subcutaneously?

The labels say into a muscle only, and no study has measured subcutaneous propionate. The UK evidence for weekly subcutaneous injection comes from enanthate and cypionate, not propionate. Discuss the route with your prescriber before changing it. [1], [21], [31] See into muscle or into the fat.

Why does testosterone propionate hurt?

It has not been studied. Injection pain is the most common complaint in public forums, but no study has compared pain between esters. The Spanish label lists no injection-site reaction, and the Italian label lists a firm swelling at the injection site and boils. Oils, concentrations and additives differ between products, especially compounded and unlicensed ones. [1], [6] See what people report.

Can I switch from cypionate to propionate?

Only with your prescriber. The US cypionate label warns against using the two interchangeably because of their different durations. Propionate also carries more testosterone per milligram (about 84% vs 70%), and the switch changes how often you inject and when blood should be drawn. [5], [4] See mg for mg.

Does testosterone propionate preserve fertility?

There is no evidence that it does in men. It switches off LH while levels are raised, like every form of testosterone, and the only study suggesting it spares fertility was in mice at lower exposure. Guidelines advise against testosterone for men trying to conceive. [2], [40], [41] See fertility and TRT and fertility.

Is testosterone propionate a steroid?

Yes. Testosterone is an anabolic-androgenic steroid hormone, which is why it is a controlled substance. At replacement doses under medical supervision it restores normal levels; bodybuilding use relies on much higher doses with different risks, and the Spanish label warns that misuse can cause serious heart, liver and psychiatric harm and dependence. [53], [1] See TRT vs steroids.

Glossary

Plain explanations of the medical, dosing and research terms used in this guide. Underlined terms in the text link here.

Adverse event

A harmful or unwanted medical event reported after someone used a treatment. A report alone does not prove the treatment caused it.

Ampoule

A small sealed glass container holding one dose or a set amount of a medicine. Once opened it cannot be resealed, so any leftover is thrown away.

Animal study

Research in animals such as rats or mice. It shows what a substance does in a living body, but results in people can differ.

Aromatase inhibitor

A medicine, such as anastrozole or exemestane, that blocks the enzyme that turns testosterone into estradiol.

Azoospermia

No sperm at all in a semen sample.

Compounding

When a pharmacy prepares a medicine from individual ingredients. Compounded testosterone propionate is made from bulk powder and is not FDA-approved.

Controlled substance

A medicine whose prescribing and possession are restricted by law because it can be misused. Testosterone is Schedule III in the US, Schedule IV in Canada and Class C in the UK.

Depot

A pool of medicine left in the body, such as oil in a muscle, that releases the drug over time. A propionate depot empties within a day or two.

Ester

A chemical tail joined to testosterone that makes it dissolve in oil and release more slowly after injection. The body removes the tail to free testosterone. Propionate is the shortest ester used for men; cypionate, enanthate and undecanoate are longer.

Estradiol

The main form of estrogen. In men it is made mostly from testosterone, so it rises when testosterone rises.

FSH (follicle-stimulating hormone)

A pituitary hormone that acts on the cells supporting sperm production. Testosterone therapy lowers it.

Gynecomastia

Growth of breast tissue in men, often tender at first. It is linked to a higher estrogen-to-testosterone balance.

Half-life

The time it takes for the level of a substance in the blood to fall by half. For injected testosterone esters it mostly reflects how fast the oil depot releases the drug. Guideline tables give propionate 20 hours.

Hematocrit

The share of the blood made up of red blood cells. Testosterone raises it, and most guidelines act when it reaches about 54%. The Spanish propionate label rules out starting above 50%.

Hypogonadotropic hypogonadism

Low testosterone because the brain and pituitary send too little LH and FSH to the testicles. It can be present from birth or start later. Also called secondary hypogonadism.

Hypogonadism

Low testosterone caused by a problem in the testicles or in the brain and pituitary signals that control them, confirmed with symptoms and repeated morning blood tests.

Intramuscular (IM)

Injected into a muscle. The Spanish propionate label specifies deep injection into the buttock muscle, given very slowly.

LH (luteinizing hormone)

A pituitary hormone that tells the testicles to make testosterone. Testosterone therapy switches it off; after propionate it stayed off for as long as testosterone stayed raised.

MACE (major adverse cardiovascular events)

A combined measure used in heart-safety trials. In TRAVERSE it meant heart attack, stroke or death from heart disease.

Pharmacokinetics

How the body absorbs, moves, breaks down and removes a substance.

Placebo

A dummy treatment with no active ingredient, used as a comparison in studies.

Polycythemia (erythrocytosis)

Too many red blood cells, shown by a high hematocrit. Testosterone therapy is a common cause.

Pulmonary oil microembolism (POME)

Tiny droplets of injected oil reaching the lungs, causing a sudden cough or shortness of breath during or soon after an injection. The Spanish propionate label lists it as rare.

Primary hypogonadism

Low testosterone because the testicles themselves do not work well, even though the pituitary sends plenty of LH and FSH.

PSA (prostate-specific antigen)

A blood test for a protein made by the prostate. It rises slightly on testosterone and is used to decide whether prostate checks are needed.

Research use only

A label on products sold for laboratory research. It does not mean a product is approved, tested for human use or legal to sell as a medicine.

Product information (SmPC)

The official prescribing document for a licensed medicine in Europe and the UK, called the summary of product characteristics. It plays the role of a US label.

Subcutaneous (SC)

Injected into the fatty layer just under the skin. It is not a route on any propionate label, and no study has measured propionate given this way.

Syringe units

Markings on an insulin syringe that measure volume. On a U-100 syringe, 100 units equal 1 mL, so 0.5 mL is 50 units.

Titration

Adjusting a dose in steps, usually based on blood tests and symptoms.

Trough level

The lowest level of a drug in the blood, measured just before the next dose. On propionate the trough comes within a day or two of each injection.

TRT (testosterone replacement therapy)

Prescribed testosterone, by injection, gel or other forms, for men with low testosterone. It switches off the brain's LH and FSH signals.

WADA

The World Anti-Doping Agency, which publishes the list of substances banned in sport. Testosterone and its esters are banned at all times.

Weekly total

All the amounts given in one week, added together. For example, 25 mg four times a week is a 100 mg weekly total.

How this guide was researched

This guide is built from a thorough review of the sources cited throughout it. They include product information from Spain, Italy, the United Kingdom, Australia and the United States, and regulator databases in the United States, Canada, Spain and Italy. They also include clinical guidelines from the United States, Europe and the United Kingdom, published studies of testosterone propionate and large trials of other forms of testosterone. We also reviewed public online forums where people describe their own experiences with testosterone propionate.

The guide cites 107 sources, including 11 product labels, 11 regulator databases and product listings, 11 guidelines and consensus statements, and 19 original studies in people, plus 30 public community threads. Each type of source answers a different question. Labels, guidelines and trials show what was approved and measured. Regulator databases show what is sold where. Personal accounts show what individual people experienced. Every numbered citation links to its entry below, labeled by source type.

How this guide was made

Research and drafting were AI-assisted. Every cited source was checked against the original, and the guide was reviewed and edited by Doserly before publication. It has not had an independent clinical review, and Doserly does not currently have medical reviewers. Doserly makes a medication and health-tracking app and runs Doserly Academy, both of which are promoted in this guide. Read our editorial policy for how guides are researched, updated and corrected.

This guide is for educational purposes. It summarizes what the reviewed sources report so the research is easier to understand; it is not medical advice. For a deeper dive, or to check any point for yourself, go straight to the cited sources.

Explore the sources