Levonorgestrel Heaton (Levonorgestrel)

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

• Emergency contraception: prevents pregnancy after unprotected intercourse when taken promptly.
• Regular contraception: incorporated in progestogen‑only regimens to inhibit ovulation and maintain contraceptive effect.
• Menstrual cycle regulation: used in certain dosing schedules to help control timing of menstrual bleeding.

• Levonorgestrel binds to progesterone receptors in the ovary and uterus, suppressing the luteinizing hormone surge and thereby inhibiting ovulation. It also thickens cervical mucus and alters the endometrial lining, reducing the likelihood of fertilization and implantation.

Levonorgestrel may cause a range of adverse reactions.

Common Side Effects

• Nausea: mild to moderate upset stomach.
• Headache: transient cranial discomfort.
• Fatigue: feeling of tiredness.
• Breast tenderness: mild swelling or soreness.
• Menstrual changes: spotting or altered flow.
• Abdominal pain: cramping or discomfort.

Serious or Rare Side Effects

• Allergic reaction: rash, swelling, or anaphylaxis.
• Severe abdominal pain: possible indication of ectopic pregnancy.
• Chest pain: may signal cardiovascular issues.
• Blood clot formation: rare thromboembolic events.
• Severe dizziness or fainting: may indicate hypotension.
• Vision changes: blurred or double vision.

When prescribing or dispensing Levonorgestrel Heaton, consider the following precautions.

• Contraindications: avoid in patients with known hypersensitivity to levonorgestrel or tablet excipients.
• Medical history: review for active thromboembolic disorders or severe liver disease.
• Timing: ensure the product is taken within the recommended window for emergency use.
• Drug interactions: assess concomitant medications that may reduce efficacy.
• Pregnancy status: do not use in confirmed pregnancy.
• Store at ambient temperature: keep below 25°C in the original pack, protect from moisture.

Levonorgestrel can interact with other medicines, affecting its effectiveness or safety.

Major Interactions (Avoid)

• Enzyme inducers (e.g., rifampin, carbamazepine, St. John's wort): may markedly reduce contraceptive efficacy.
• Certain antiretrovirals (e.g., efavirenz): can lower plasma levels of levonorgestrel.

Moderate Interactions (Monitor Closely)

• Antifungal agents (e.g., ketoconazole): may increase levonorgestrel concentrations.
• Hormonal therapies (e.g., combined oral contraceptives): may have additive hormonal effects.
• Some antibiotics (e.g., ampicillin): may slightly diminish effectiveness, requiring backup contraception.