1. Clinical Overview
Nandrolone Decanoate is a long-acting injectable anabolic-androgenic steroid (AAS) derived from testosterone. It is an esterified prodrug of nandrolone, designed for deep intramuscular administration. In the Indian medical context, it is a prescription-only medicine with a narrow therapeutic window, primarily indicated for the treatment of specific types of anemia and osteoporosis. Its use is strictly regulated due to significant androgenic and anabolic side effects, and a high potential for misuse in sports and bodybuilding.
| Onset | Duration | Bioavailability |
|---|---|---|
| Gradual, typically 1-3 days after intramuscular injection. | Prolonged; pharmacological effects can last for 2-4 weeks due to the decanoate ester, which provides a slow, sustained release from the injection site. | Approximately 100% following intramuscular injection, as it bypasses first-pass metabolism. |
2. Mechanism of Action
Nandrolone acts as an agonist at the androgen receptor (AR). Upon binding, the receptor-ligand complex translocates to the cell nucleus, dimerizes, and binds to specific DNA sequences (Androgen Response Elements), modulating the transcription of target genes. This leads to increased protein synthesis (anabolic effect) and the development of male sexual characteristics (androgenic effect). Its anabolic-to-androgenic ratio is estimated to be higher than testosterone, meaning it promotes muscle and bone growth with relatively less virilizing effects.
3. Indications & Uses
- Anemia of chronic renal failure (adjunct therapy)
- Postmenopausal osteoporosis (as a second-line agent to increase bone mass)
- Catabolic states or severe weight loss associated with chronic infections, major surgery, or prolonged corticosteroid therapy (rarely used now)
4. Dosage & Administration
Adult Dosage: **Anemia (renal failure):** 50-100 mg deep IM every 1-4 weeks, adjusted based on hematocrit response. **Osteoporosis (postmenopausal):** 50 mg deep IM every 3-4 weeks. Doses must be individualized to the lowest effective dose.
Administration: For deep intramuscular (IM) injection only, preferably in the gluteal muscle. Use a 21-23 gauge needle, 1.5 inches long. Aspirate before injection to avoid intravascular administration. Rotate injection sites to prevent lipoatrophy or abscess formation. The oil-based solution should be at room temperature before administration.
5. Side Effects
Common side effects may include:
- Injection site pain, swelling, or irritation.
- Acne vulgaris, oily skin.
- Mild fluid retention (edema).
- Increased frequency of erections (priapism in some cases).
- Headache, fatigue.
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Warfarin / Acenocoumarol | Nandrolone may potentiate anticoagulant effect by reducing synthesis of clotting factors and increasing sensitivity to warfarin. Risk of severe bleeding. | Major |
| Oral Hypoglycemic Agents / Insulin | Anabolic steroids may alter glucose tolerance, requiring dose adjustment of anti-diabetic medication. | Moderate |
| Adrenocorticotropic Hormone (ACTH) / Corticosteroids | Increased risk of severe edema and acne due to additive sodium-retaining effects. | Moderate |
| Cyclosporine, Tacrolimus | Potential increased risk of nephrotoxicity and hepatotoxicity. | Moderate |
| Hepatotoxic drugs (e.g., Paracetamol high dose, Statins, Azole antifungals) | Additive risk of liver damage. | Major |
7. Patient Counselling
- DO report any signs of jaundice (yellow eyes/skin, dark urine), severe abdominal pain, or unusual bleeding/bruising immediately.
- DO inform all your doctors and surgeons that you are taking this medication before any procedure.
- DO attend all scheduled follow-ups for blood pressure checks and laboratory tests (LFT, lipids, CBC, PSA).
- DO NOT share this medication with anyone, especially athletes or bodybuilders.
- DO NOT use this medicine to enhance athletic performance or physique. It is illegal and dangerous.
- DO NOT adjust the dose or frequency without consulting your doctor.
8. Toxicology & Storage
Overdose: Symptoms are an extension of side effects: severe nausea, vomiting, headache, priapism, significant edema leading to congestive heart failure, marked hepatotoxicity signs (jaundice, abdominal pain), severe hypercalcemia, polycythemia, and aggressive or psychotic behavior.
Storage: Store at controlled room temperature (15°C to 30°C). Protect from light. Do not freeze. Keep the vial in the outer carton. Keep out of reach of children and in a secure location to prevent misuse. Discard any unused portion of the multi-dose vial as per hospital/pharmacy policy, typically within 28 days of first puncture.