Testosterone Propionate is a short-acting ester of the primary endogenous androgen, testosterone. It is administered via intramuscular injection and is used for testosterone replacement therapy (TRT) in conditions of androgen deficiency. In the Indian context, it is a cornerstone of treatment for male hypogonadism but is also subject to significant misuse in sports and bodybuilding communities.
Adult: For male hypogonadism: 25 to 50 mg intramuscularly 2 to 3 times per week. Typical regimen: 50 mg every other day or three times weekly. Dose must be individualized based on clinical response and serum testosterone levels (measured at trough).
Note: For intramuscular injection ONLY, preferably into the gluteus medius (upper outer quadrant of buttock) or vastus lateralis (thigh). Use a 22-23 gauge, 1-1.5 inch needle. Aspirate before injection to avoid intravascular administration. Rotate injection sites to prevent lipoatrophy and fibrosis. Solution is in oil (sesame or castor); warm vial in hands to reduce viscosity. Administer deep IM slowly.
Testosterone Propionate acts as a prodrug. After intramuscular injection and ester hydrolysis, the released testosterone enters target cells and is reduced by 5α-reductase to its more potent metabolite, dihydrotestosterone (DHT), in some tissues (e.g., prostate, skin). Testosterone or DHT binds to the intracellular androgen receptor (AR). The hormone-receptor complex translocates to the nucleus, binds to specific DNA sequences (androgen response elements), and modulates gene transcription, leading to anabolic and androgenic effects.
Pregnancy: CONTRANDICATED - Pregnancy Category X. Testosterone is teratogenic and can cause virilization of the female fetus. Women of childbearing age should not handle broken tablets or injection materials without gloves.
Driving: Generally safe. However, patients should be cautioned about potential side effects like dizziness, headache, or visual disturbances that may impair ability to drive or operate machinery.
| Warfarin and other Oral Anticoagulants | Testosterone may potentiate anticoagulant effect by reducing synthesis of clotting factors; increased risk of bleeding. | Major |
| Corticosteroids (e.g., Prednisolone) | Additive risk of severe fluid retention and edema. | Major |
| Insulin and Oral Hypoglycemics | Testosterone may alter insulin sensitivity; blood glucose monitoring required; dose adjustment may be needed. | Moderate |
| Cyclosporine, Tacrolimus | Testosterone may inhibit metabolism of these drugs, increasing their blood levels and risk of toxicity. | Moderate |
| Propranolol | Testosterone may increase clearance of propranolol, reducing its effect. | Moderate |
| ACTH or Adrenal Steroids | Increased risk of edema. | Moderate |
| Oxyphenbutazone | Increased serum levels of oxyphenbutazone. | Minor |
Same composition (Testosterone Propionate (50mg/1ml)), different brands: