Nebremel (Levonorgestrel)

Levonorgestrel is a progestogen used in hormonal contraception to prevent pregnancy.

• Emergency contraception: prevents pregnancy after unprotected intercourse when taken within the recommended time frame.
• Regular contraception: used as a progestin‑only method to inhibit ovulation and maintain contraceptive effect.
• Menstrual cycle regulation: may be incorporated in regimens to help control irregular menstrual bleeding.

• Levonorgestrel binds to progesterone receptors in the hypothalamus and pituitary, suppressing the luteinizing hormone surge and thereby preventing ovulation. It also induces changes in the endometrial lining that reduce its receptivity to implantation and thickens cervical mucus, creating a barrier to sperm penetration.

Levonorgestrel is generally well tolerated, but several adverse reactions have been reported.

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Headache: transient tension‑type headaches.
• Breast tenderness: mild discomfort or swelling.
• Menstrual changes: spotting, early or delayed periods.
• Abdominal pain: cramping or mild discomfort.
• Fatigue: feeling unusually tired.

Serious or Rare Side Effects

• Severe allergic reaction: rash, swelling, or difficulty breathing.
• Thromboembolic events: rare blood clot formation.
• Ectopic pregnancy: implantation outside the uterus.
• Liver dysfunction: abnormal liver enzyme levels.
• Persistent abdominal pain: may indicate serious gynecologic condition.
• Severe vomiting: leading to dehydration.

Levonorgestrel should be used with awareness of specific safety considerations.

• Contraindicated in pregnancy: should not be taken if a confirmed pregnancy exists.
• Liver disease: use with caution in patients with hepatic impairment.
• Known hypersensitivity: avoid if allergic to levonorgestrel or any excipients.
• Unexplained vaginal bleeding: seek medical evaluation before use.
• Drug interactions: review concomitant medications that may reduce efficacy.
• Store at room temperature: keep in the original packaging, protect from moisture and direct sunlight.

Levonorgestrel may interact with other medicines, affecting its contraceptive effectiveness.

Major Interactions (Avoid)

• Rifampicin and other enzyme inducers: may markedly reduce levonorgestrel levels.
• Certain antiretrovirals (e.g., efavirenz): can decrease contraceptive efficacy.
• St. John’s wort: herbal inducer that lowers drug exposure.

Moderate Interactions (Monitor Closely)

• Antifungal agents (e.g., ketoconazole): may increase levonorgestrel concentrations.
• Certain antibiotics (e.g., ampicillin): potential modest reduction in effectiveness.
• Hormonal therapies: concurrent use may require dosage adjustment or additional contraceptive methods.