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 Schedule H prescription drug with strict indications, primarily for the treatment of refractory anemia associated with chronic renal failure and osteoporosis in post-menopausal women. Its potent anabolic effects, with reduced androgenic activity compared to testosterone, make it useful for promoting protein synthesis, nitrogen retention, and erythropoiesis. However, due to significant adverse effects and high potential for misuse in sports and bodybuilding, its use is highly restricted and monitored.
| Onset | Duration | Bioavailability |
|---|---|---|
| Gradual, with anabolic effects typically noticeable within 1-2 weeks of initiating therapy. | Prolonged due to the decanoate ester. The pharmacological effect lasts for approximately 3-4 weeks per injection. | Approximately 100% following intramuscular injection, as it bypasses first-pass metabolism. |
2. Mechanism of Action
Nandrolone binds to intracellular androgen receptors (AR) in target tissues (muscle, bone, bone marrow, kidney). The drug-receptor complex translocates to the cell nucleus, binds to specific DNA sequences (Androgen Response Elements), and modulates gene transcription. This leads to increased protein synthesis, nitrogen retention, and stimulation of erythropoietin production. Its anabolic:androgenic ratio is higher than testosterone due to its inability to be 5α-reduced to a more potent androgen (like dihydrotestosterone) in many tissues.
3. Indications & Uses
- Treatment of refractory anemia associated with chronic renal failure (under specialist care).
- Adjuvant therapy in osteoporosis in post-menopausal women (to increase bone mass, though rarely used as first-line).
4. Dosage & Administration
Adult Dosage: **Anemia of renal failure:** 50-200 mg deep IM every 1-4 weeks, adjusted based on hematocrit response. **Osteoporosis in post-menopausal women:** 50 mg deep IM every 3-4 weeks. Doses at the 200mg strength are typically used for the anemia indication and administered at longer intervals (e.g., 200mg every 3-4 weeks).
Administration: For deep intramuscular (IM) injection only, preferably into 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.
- Oiliness of skin, seborrhea.
- Mild fluid retention (edema).
- Increased frequency of erections (in men).
- Virilization in women (hirsutism, voice deepening, clitoromegaly).
- Amenorrhea or menstrual irregularities.
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Warfarin / Acenocoumarol | Nandrolone may potentiate anticoagulant effect by increasing prothrombin time; risk of bleeding. | Major |
| Oral Hypoglycemic Agents / Insulin | Nandrolone may alter glucose tolerance, requiring dose adjustment of antidiabetic drugs. | Moderate |
| Adrenocorticotropic Hormone (ACTH) / Corticosteroids | Increased risk of severe edema and acne. | Moderate |
| Cyclosporine, Tacrolimus | Potential increased risk of hepatotoxicity and nephrotoxicity. | 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, or severe abdominal pain immediately.
- DO inform all your doctors and surgeons that you are taking this medication.
- DO attend all scheduled follow-up appointments for blood tests (LFT, lipids, CBC, PSA).
- DO use effective contraception if you are a woman of childbearing potential.
- DONT share this medication with anyone else. It is illegal and dangerous.
- DONT use it for bodybuilding or athletic performance. The health risks far outweigh any benefits.
- DONT adjust the dose or frequency without consulting your doctor.
- DONT inject anywhere other than deep muscle as instructed.
8. Toxicology & Storage
Overdose: Symptoms are an extension of side effects: severe nausea, vomiting, headache, priapism, significant edema leading to congestive heart failure, severe hypercalcemia (confusion, arrhythmias), marked polycythemia, jaundice, and acute psychotic episodes.
Storage: Store below 25°C. Do not freeze. Protect from light. Keep the vial in the outer carton. Keep out of reach of children and unauthorized persons. Do not use if the solution is discolored or contains particulate matter. Discard single-use vials after use. Do not store opened multi-dose vials for extended periods; follow manufacturer's in-use stability instructions.