Testosterone Enanthate is one of the most widely prescribed testosterone formulations in gender-affirming care for transgender men and non-binary individuals seeking masculinisation. As an injectable form of testosterone replacement therapy (TRT), it promotes the development of secondary male characteristics and supports alignment with gender identity.
In transgender healthcare, Testosterone Enanthate is a cornerstone medication used to initiate and maintain masculinising physical changes. Its predictable pharmacokinetics and established safety profile make it a preferred option for many patients and providers.
Testosterone Enanthate is a synthetic ester of testosterone that is typically administered via intramuscular injection. Once injected, it is gradually hydrolysed into free testosterone in the bloodstream, mimicking the body’s natural hormone production. It enhances masculinisation by increasing circulating levels of testosterone in the body.
While naturally produced testosterone is synthesised in the testes and adrenal glands, Testosterone Enanthate is a laboratory-manufactured compound. It is metabolised primarily in the liver and eliminated via the urine. Blood levels of testosterone are maintained through consistent administration according to an individual’s treatment plan.
Reference ranges for total testosterone levels in adults (used in lab monitoring):
Note: Testosterone levels vary based on timing relative to injection, lab method, and individual physiology.
Temporary fluctuations may occur between injections. Sustained abnormalities should be evaluated for underlying metabolic, hepatic, or dosing issues.
If not properly dosed and monitored, testosterone therapy may increase cardiovascular risk, alter lipid profiles, or contribute to liver strain. Monitoring is essential for long-term safety.
1.1 Wash your hands thoroughly with soap and water.
1.2 Gather your supplies, including the testosterone enantate ampoule, the syringe, the first needle for drawing up the testosterone enantate, the second needle for injecting the testosterone enantate, an alcohol wipe, cotton wool or gauze, and a sharps bin.
1.3 Check the medication name, dose, expiry date, and integrity of the packaging.
Do not use if the medication is not testosterone enantate, is of the incorrect dose, has passed the expiry date, or the integrity of the packaging is compromised.
2.1 Attach the first needle to the syringe, ensuring that the cap stays on the needle at all times. Put the empty syringe and needle down.
2.2 Pick up the ampoule of testosterone enanthate and flick the top firmly to ensure that all the liquid is in the main part of the ampoule.
2.3 Snap the top off the ampoule by firmly grasping between finger and thumb and pushing away from the dot on the neck of the ampoule.
2.4 Remove the needle cap and place the needle into the ampoule so that the needle tip rests against hte bottom of the ampoule.
2.5 Pull back the plunger slowly to draw the liquid into the syringe, ensuring that none is left in the ampoule.
2.6 Bring the syringe back out of the ampoule and carefully remove the needle.
2.7 Dispose of the needle, the ampoule and the ampoule top in the sharps bin.
2.8 Check for air bubbles in the syringe by holding upright with the plunger pointing down. Firmly tap the syringe with your finger until the bubbles rise to the top of the syringe.
2.9 Slowly push the plunger up to force the air bubbles out of the syringe.
2.10 After the air has been removed, attach the second needle to the syringe. The injection is now ready to be given.
3.1 Clean the skin of the chosen injection site with an alcohol swab.
3.2 Gently hold the skin around your chosen injection site by forming a V with the fingers of your nondominant hand and placing the heel of this hand on the skin.
3.3 Holding the syringe like a pencil or a dart, completely insert the needle with a quick and firm motion at an angle of 90° to the skin surface.
3.4 Remove your nondominant hand from the skin and use it to hold the barrel of the syringe.
3.5 With your dominant hand, gently pull back the plunger slightly to check for blood. If you see blood, do not proceed with the injection. Remove the needle, discard the syringe, and begin again. If you do not see blood, then it is safe to proceed with the injection.
3.6 Push the plunger to inject the entire contents of the syringe slowly and steadily all the way in.
3.7 When the medication is fully injected, withdraw the needle and syringe.
4.1 Dispose of the syringe and needle in the sharps bin immediately. The syringe and needle must not be placed in the household rubbish.
4.2 Gently place a piece of cotton wool or gauze over the injection site for a few seconds. This will help seal the punctured tissue and prevent any leakage. Do not rub the injection site after injection.
4.3 Record all details of the injection in the injection diary or using other means. It is recommended that you note where you injected, the dose injected, the date and time of injection, and any injection reactions.
Testosterone Enanthate is monitored via total testosterone blood tests, ideally taken midway between injections to assess stable hormone levels. Additional markers monitored during therapy may include:
Testosterone Enanthate is typically administered as intramuscular injections every 1–2 weeks, depending on patient response, dose, and healthcare provider guidance.
Initial doses often range from 50–100 mg weekly, with adjustments made based on serum testosterone levels and clinical response.
Bloodwork is usually performed every 3–6 months initially, then annually once stable.
Other testosterone formulations include testosterone cypionate, gel, cream, patches, and long-acting injectable options (e.g. Nebido/testosterone undecanoate).
It is injected intramuscularly, typically every 1–2 weeks, depending on the dose and formulation.
Yes. With guidance from your healthcare provider, many people self-inject at home using safe sterile technique.
Effects such as increased libido and energy may occur in the first few weeks, with voice, muscle, and hair changes developing over 3–6 months and beyond.
Most individuals will stop menstruating within 3–6 months of starting testosterone, though some irregular bleeding can occur early in treatment.
Testosterone can suppress ovulation and fertility. While this may be reversible in some people, others may lose fertility permanently. Fertility preservation should be discussed before starting treatment.
