Leuprolide Acetate Injection is a synthetic gonadotropin-releasing hormone (GnRH) agonist used for conditions related to sex hormone–dependent growths or hormone regulation. It works by initially stimulating, then suppressing, the pituitary release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which reduces estrogen and testosterone levels in the body.

Here are the key details:

1. Composition and Form:

• Active ingredient: Leuprolide acetate.

• Supplied as sterile solution or lyophilized powder for subcutaneous (SC) or intramuscular (IM) injection.

• Available in single-dose vials, prefilled syringes, and long-acting depot formulations.

2. Mechanism of Action:

• Initially causes a temporary rise (“flare”) in LH, FSH, testosterone, and estrogen.

• Continuous administration desensitizes GnRH receptors in the pituitary, leading to suppression of gonadotropin release.

• Results in decreased testosterone in men and decreased estrogen in women, creating a reversible medical castration–like state.

3. Indications:

• Prostate cancer (palliative treatment in advanced cases).

• Endometriosis (reduces estrogen to relieve pain and slow disease progression).

• Uterine fibroids (shrinks fibroids and reduces bleeding).

• Central precocious puberty (to delay premature puberty in children).

• Sometimes used in assisted reproductive technology (ART) protocols.

4. Administration:

• Short-acting forms may be given daily subcutaneously.

• Depot formulations (monthly, 3-month, or 6-month injections) provide long-lasting effect with a single IM/SC dose.

• Dose and duration depend on the indication.

5. Side Effects:

• Due to hormone suppression: hot flashes, sweating, decreased libido, erectile dysfunction (men), vaginal dryness (women).

• Bone mineral density loss with long-term use (risk of osteoporosis).

• Mood changes, depression, headache, fatigue.

• Initial flare in symptoms (e.g., bone pain in prostate cancer, increased bleeding in endometriosis) during the first 1–2 weeks.

• Injection-site reactions (pain, redness, swelling).

6. Contraindications:

• Known hypersensitivity to leuprolide or other GnRH analogs.

• Pregnancy and breastfeeding (may harm fetus or infant).

• Undiagnosed abnormal vaginal bleeding in women.

7. Precautions:

• Monitor bone density in long-term therapy; supplementation with calcium and vitamin D may be advised.

• Careful monitoring at therapy initiation in prostate cancer due to risk of tumor flare (sometimes combined with anti-androgen initially).

• Use caution in patients with cardiovascular disease, diabetes, or risk factors for osteoporosis.

• Pediatric use requires monitoring of growth and bone development.

8. Storage:

• Store at controlled room temperature, protected from light.

• Depot formulations should be reconstituted and administered immediately after preparation.