Nebremel (Levonorgestrel)

Levonorgestrel acts on the hormonal pathways that regulate ovulation and implantation.

• Emergency contraception: prevents pregnancy when taken shortly after unprotected sex.
• Prevention of pregnancy: used as a regular hormonal contraceptive to inhibit ovulation.
• Ovulation inhibition: delays or suppresses the release of an egg, reducing the chance of fertilisation.

• Levonorgestrel binds to progesterone receptors in the hypothalamus and pituitary, suppressing the luteinizing hormone surge required for ovulation. It also induces changes in the cervical mucus and endometrial lining, making it less receptive to sperm and implantation, respectively.

Levonorgestrel may cause a range of adverse reactions, most of which are mild and transient.

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Abdominal pain: cramping or discomfort in the lower abdomen.
• Headache: occasional tension‑type headache.
• Dizziness: brief episodes of light‑headedness.
• Fatigue: feeling unusually tired.
• Menstrual changes: spotting or altered timing of the next period.

Serious or Rare Side Effects

• Allergic reaction: rash, itching, swelling, or difficulty breathing.
• Severe abdominal pain: persistent or worsening pain requiring medical attention.
• Chest pain: may indicate cardiovascular involvement.
• Blood clots: rare thromboembolic events.
• Severe vomiting: persistent vomiting leading to dehydration.

Levonorgestrel should be used with awareness of specific safety considerations.

• Contraindication: known hypersensitivity to levonorgestrel or any tablet component.
• Pregnancy: not indicated for ongoing pregnancy; confirm negative pregnancy test before use.
• Breastfeeding: caution advised; consult a healthcare professional.
• Drug interactions: avoid concomitant use of strong enzyme inducers that may reduce efficacy.
• Medical conditions: use with care in patients with liver disease or uncontrolled hypertension.
• Store below 25°C: keep in the original packaging, protect from moisture and direct sunlight.

Levonorgestrel can interact with other medicines that affect hormone metabolism or absorption.

Major Interactions (Avoid)

• Rifampicin: may markedly reduce contraceptive effectiveness.
• St. John’s wort: herbal inducer that can lower drug levels.
• Carbamazepine: enzyme inducer decreasing efficacy.
• Phenytoin: reduces plasma concentrations.
• Barbiturates: may compromise contraceptive reliability.

Moderate Interactions (Monitor Closely)

• Ketoconazole: antifungal that can increase levonorgestrel levels.
• Efavirenz: antiretroviral that may modestly lower effectiveness.
• Other hormonal therapies: may require dosage adjustment.
• Certain antibiotics (e.g., tetracycline): potential for reduced absorption.