Sustanon 250 is a clear, pale-yellow oily solution containing four esterified forms of testosterone. It belongs to a group of medicines called androgens, which are hormones responsible for many male reproductive and physical characteristics.
An ester is a modified form of a hormone that changes how quickly the body absorbs and releases it. The combination of different esters provides both earlier and longer-lasting testosterone release after injection.
Testosterone is naturally produced mainly by the testicles in men. It helps support:
Sustanon 250 is not intended to treat ordinary tiredness, normal ageing, low mood, or poor gym performance unless a healthcare professional confirms testosterone deficiency as the underlying cause.
|
Ingredient |
Amount per 1 mL |
|
Testosterone propionate |
30 mg |
|
Testosterone phenylpropionate |
60 mg |
|
Testosterone isocaproate |
60 mg |
|
Testosterone decanoate |
100 mg |
|
Total testosterone esters |
250 mg |
|
Testosterone content after ester conversion |
Approximately 176 mg |
|
Refined arachis oil |
Vehicle |
|
Benzyl alcohol |
Preservative in some product versions |
The exact excipient list and presentation may vary between countries. Sustanon 250 products may be supplied in glass ampoules or vials. The medicine contains refined peanut oil, also known as arachis oil, which is particularly important for people with peanut or soya allergy.
After a deep intramuscular injection, the four testosterone esters are gradually broken down in the bloodstream. This releases testosterone, which can then act on androgen receptors in different tissues.
Testosterone may also be converted into other hormones, including dihydrotestosterone (DHT) and oestradiol, a form of oestrogen. These hormones contribute to the overall effects of testosterone treatment.
A single Sustanon 250 injection can produce a rise in testosterone levels within a short period. Official product information reports peak total testosterone levels approximately 24–48 hours after administration, with levels returning toward the lower end of the normal male range at approximately 21 days. Individual results vary depending on metabolism, injection interval, medical condition, and baseline hormone levels.
When testosterone deficiency is genuinely present, treatment may help improve:
Treatment does not guarantee improvement, and symptoms such as fatigue or erectile dysfunction may have causes unrelated to testosterone. A doctor should investigate other possible causes before prescribing testosterone replacement.
Sustanon 250 may be prescribed for adults with confirmed testosterone deficiency, also called male hypogonadism.
The diagnosis should normally be supported by:
Symptoms alone are not enough to justify treatment. A healthcare professional should assess the possible cause of low testosterone and rule out other conditions that may cause similar symptoms.
Some local product information also describes Sustanon 250 as supportive therapy for female-to-male transgender patients. Testosterone treatment for this purpose should be planned and monitored by a specialist team. The dose and treatment schedule may differ from standard replacement therapy.
Treatment can cause masculinising changes such as a lower voice, increased facial and body hair, increased muscle mass, menstrual changes or cessation, changes in body-fat distribution, increased libido, clitoral enlargement, and male-pattern hair loss in some individuals. Some changes may be permanent. Fertility considerations should be discussed before treatment.
Sustanon 250 should not generally be used by people who:
The UK patient information states that the product should not be used in pregnancy, suspected prostate or breast tumours, peanut or soya allergy, or in children under three years of age. Local labels may differ, so the country-specific leaflet should be checked.
The primary use is replacing testosterone in adult men whose bodies do not produce enough natural testosterone. Treatment may be considered for conditions affecting the testicles, pituitary gland, hypothalamus, testosterone production after certain medical treatments, or other medically confirmed causes of hypogonadism.
Testosterone should not be prescribed solely because a person reports tiredness, low motivation, or difficulty building muscle.
In some healthcare systems, Sustanon 250 may be used as part of masculinising hormone therapy for female-to-male transgender adults. The treatment plan may include specialist assessment, regular blood testing, fertility counselling, and monitoring of physical and emotional changes.
Sustanon 250 is not intended for bodybuilding, athletic performance enhancement, weight loss, treating normal ageing, increasing testosterone when blood levels are already normal, treating infertility in men, self-treatment for erectile dysfunction, or increasing height after growth has finished.
Misuse of testosterone, particularly at high doses or with other anabolic steroids, has been associated with serious cardiovascular, liver, psychiatric, reproductive, and hormonal risks.
Sustanon 250 is not taken by mouth. It is administered by deep intramuscular injection into a large muscle such as the buttock, upper leg, or upper arm. A doctor or nurse should administer the injection. The oily solution should be injected slowly and strictly into the muscle.
The commonly stated adult dosage is one 1 mL injection every three weeks. This is only a general product-information schedule. The actual interval may be adjusted according to testosterone trough level, symptoms before the next injection, peak-related symptoms, haematocrit and haemoglobin, blood pressure, prostate assessment, side effects, the cause of testosterone deficiency, age, and medical history.
Some specialist protocols use a different interval. Do not copy another person’s schedule or use a bodybuilding dose.
If you miss a scheduled injection, contact your doctor or clinic as soon as possible. Do not receive two injections together or double the next dose.
Because the injection is normally administered by a healthcare professional, overdose is less likely. Excess testosterone exposure may contribute to frequent or prolonged erections, increased red blood cell levels, mood or behavioural changes, fluid retention, worsening acne, and suppression of sperm production. Contact a healthcare professional if you think you have received too much.
Testosterone treatment requires regular monitoring. Before treatment, the prescriber may assess morning testosterone levels on two separate occasions, full blood count, haemoglobin and haematocrit, prostate symptoms, PSA where clinically appropriate, blood pressure, cardiovascular risk, liver and kidney health, fertility plans, sleep apnoea symptoms, and other possible causes of low testosterone.
During treatment, the doctor may repeat testosterone levels and blood counts. Prostate assessment and PSA monitoring may be recommended, particularly in older men or those with prostate symptoms. Treatment may need to be reduced, paused, or stopped if there is significant erythrocytosis, severe fluid retention, serious cardiovascular complications, worsening prostate symptoms, or another clinically important adverse effect.
Tell your doctor before receiving Sustanon 250 if you have high blood pressure, heart disease or a previous heart attack, kidney disease, liver disease, diabetes, epilepsy, migraine or recurrent headaches, sleep apnoea, difficulty passing urine, an enlarged prostate, a blood-clotting disorder, previous deep-vein thrombosis or pulmonary embolism, obesity or prolonged immobility, a history of high red blood cell levels, plans to have children, or peanut or soya allergy.
Testosterone may increase prostate tissue activity and can worsen urinary symptoms in some people. A doctor may examine the prostate and measure PSA before treatment and during follow-up. Sustanon 250 should not be used when prostate cancer is known or suspected.
Seek medical advice for difficulty starting urination, weak urine flow, frequent urination at night, blood in the urine, new pelvic pain, or a rapid change in urinary symptoms.
Testosterone can increase red blood cell production. If the red blood cell count becomes too high, blood may become more viscous, potentially increasing clotting concerns. Seek urgent help for sudden chest pain, sudden shortness of breath, coughing blood, severe dizziness or fainting, one-sided leg pain or swelling, sudden vision changes, or sudden weakness or difficulty speaking.
Androgen therapy may cause fluid retention. This can be more serious in people with heart, liver, or kidney disease. Warning signs include rapid unexplained weight gain, swollen ankles, increasing breathlessness, reduced exercise tolerance, or abdominal swelling.
Testosterone may worsen sleep apnoea in susceptible people. Tell your doctor if you snore heavily, stop breathing during sleep, wake gasping, or feel excessively sleepy during the day.
Testosterone replacement can suppress natural testosterone production and sperm formation. It may reduce fertility or cause temporary infertility during treatment. Sustanon 250 is not a fertility medicine. If you want to father a child, discuss this before starting treatment.
Side effects differ between individuals. Some effects may be noticed by the patient, while others are identified through blood tests.
Possible effects include injection-site pain or irritation, acne, itching, nausea, muscle pain, weight gain, fluid retention, swollen ankles or feet, increased blood pressure, increased or decreased libido, mood changes, nervousness or irritability, depression, breast enlargement or tenderness in men, prostate enlargement, hair loss, reduced testicular size, reduced sperm production, changes in liver-function tests, changes in cholesterol or lipid levels, and increased haemoglobin or haematocrit.
Testosterone treatment can cause frequent erections, a prolonged or painful erection, changes in ejaculation, reduced sperm production, reduced testicular size, infertility, changes in libido, and breast enlargement. A painful erection lasting several hours requires urgent medical attention.
Where testosterone is used in a specialist gender-affirming setting, or through inappropriate exposure, possible masculinising effects include deepening of the voice, increased facial or body hair, acne, menstrual irregularity or absence, enlargement of the clitoris, male-pattern hair loss, and changes in libido. Some effects, particularly voice deepening, may not fully reverse.
Testosterone can cause early sexual development, increased erections, genital enlargement, and accelerated bone maturation in children. Accelerated growth of bones may eventually limit adult height. Use in children requires specialist supervision.
Rarely, an oily injection can cause pulmonary oil microembolism. Symptoms may begin during or shortly after injection and may include cough, shortness of breath, chest pain, excessive sweating, dizziness, pins and needles, feeling faint, or fainting. Medical staff should observe the patient during and immediately after the injection.
Tell your doctor or pharmacist about every medicine, vitamin, supplement, and performance-enhancing product you use.
Important potential interactions include anticoagulants, diabetes medicines, SGLT2 inhibitors, corticosteroids or ACTH, enzyme-inducing medicines, and enzyme-inhibiting medicines. Testosterone may increase the effect of some blood thinners, alter blood glucose control, increase the risk of a raised red blood cell count with certain medicines, and affect fluid retention. It may also influence some thyroid, glucose, and other laboratory tests.
Never stop an anticoagulant or diabetes medicine without medical advice.
Storage instructions can vary by market and presentation, but product information generally advises:
Return unused or unwanted medicine to a pharmacist or an approved medication-disposal service.
It is used mainly for testosterone replacement therapy in adult men with confirmed testosterone deficiency. Some country-specific product information also describes supportive use in female-to-male transgender patients.
Sustanon 250 is a testosterone medicine. It contains four testosterone esters that are converted into testosterone in the body.
The name refers to the total 250 mg of testosterone esters contained in 1 mL. The actual testosterone content after removing the ester portions is approximately 176 mg.
The usual product-information schedule is one 1 mL injection every three weeks. A doctor may adjust the interval based on blood tests, symptoms, and side effects.
Do not self-inject unless your clinician has specifically prescribed this arrangement, assessed your suitability, and provided practical training under local regulations. Product information states that injections should be given by a doctor or nurse.
No. It is a prescription treatment for confirmed testosterone deficiency, not a bodybuilding or performance-enhancing product. High-dose or non-prescribed use can cause serious health problems.
In people with confirmed testosterone deficiency, treatment may improve lean body mass and reduce fat mass. It is not appropriate for increasing muscle size when testosterone levels are normal.
It may help when erectile or sexual symptoms are related to testosterone deficiency. Erectile dysfunction may also result from diabetes, cardiovascular disease, medicines, anxiety, relationship problems, or other conditions, so medical evaluation is important.
Yes. It can suppress sperm formation and reduce fertility during treatment. Speak with a doctor before starting if you plan to have children.
The product is not generally indicated for women in many markets and must not be used during pregnancy or breastfeeding. Specialist clinicians may use testosterone as part of gender-affirming care according to local protocols.
Do not combine treatments without medical advice. Your clinician should review your heart health, blood pressure, other medicines, and the cause of erectile dysfunction.
Contact your doctor or nurse as soon as possible. Do not double the next dose.
Its effects do not stop immediately after discontinuation because the injection contains esters with different release durations. Testosterone levels and symptoms gradually change over time. The exact duration varies from person to person.
Acne and oily skin can occur because testosterone stimulates androgen-sensitive skin glands. Tell your doctor if acne becomes severe or persistent.
It may accelerate male-pattern hair loss in people who are genetically predisposed. It may also increase facial or body hair in some users.
An increase in blood pressure has been reported. People with hypertension should have their blood pressure monitored during treatment.
Testosterone may increase prostate activity and prostate size. Regular clinical review and PSA monitoring may be recommended, particularly in older men.
Testosterone can be misused and may lead to dependence or withdrawal symptoms when taken at high doses, especially with other anabolic steroids. Use it only as prescribed.
There is no universal food or drink restriction in the product leaflet, but heavy alcohol use may worsen blood pressure, liver health, mood, and overall treatment risks. Ask your clinician about your personal situation.
Many people can exercise, but testosterone treatment does not remove the need for safe training, appropriate nutrition, and medical supervision. Competitive athletes should check anti-doping rules because Sustanon 250 can affect testing.
Get urgent medical help for chest pain, sudden breathlessness, coughing blood, fainting, severe allergic symptoms, one-sided leg swelling, sudden vision loss, yellow skin or eyes, or a prolonged painful erection.