Norlevo (Levonorgestrel)

Norlevo is a progestogen emergency contraceptive that acts on the reproductive hormonal pathway to prevent pregnancy.

• Emergency contraception: prevents pregnancy after unprotected sex when taken within the recommended time window.
• Unintended pregnancy prevention: provides a post‑coital contraceptive effect for women seeking rapid pregnancy avoidance.
• Ovulation delay: interferes with the normal ovulatory cycle to reduce the chance of fertilisation.

• Levonorgestrel binds to progesterone receptors in the hypothalamic‑pituitary‑ovarian axis, suppressing the luteinising hormone surge required for follicular rupture. By delaying or inhibiting ovulation, it reduces the likelihood of fertilisation. If ovulation has already occurred, the drug may impair sperm transport or affect endometrial receptivity, thereby decreasing the chance of implantation.

Levonorgestrel is generally well tolerated, but adverse reactions can occur.

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Abdominal pain or cramps: transient discomfort.
• Fatigue or tiredness: temporary loss of energy.
• Headache: mild to moderate intensity.
• Dizziness: brief episodes of light‑headedness.
• Menstrual changes: spotting or altered timing of the next period.

Serious or Rare Side Effects

• Severe allergic reaction (anaphylaxis): difficulty breathing, swelling of face or throat.
• Persistent vomiting or severe abdominal pain: may indicate a more serious condition.
• Chest pain or palpitations: requires immediate medical attention.
• Severe skin rash or hives: signs of hypersensitivity.
• Liver dysfunction: jaundice or abnormal liver function tests.
• Thromboembolic events: rare clotting disorders, especially in high‑risk individuals.

When using Norlevo, consider the following safety measures.

• Timing of intake: take as soon as possible after unprotected intercourse, ideally within 72 hours.
• Contraindications: avoid if known hypersensitivity to levonorgestrel or any tablet excipients.
• Pregnancy status: do not use if already pregnant; confirm with a test if unsure.
• Underlying conditions: caution in women with active liver disease, uncontrolled hypertension, or a history of thromboembolic disorders.
• Drug interactions: review concomitant medications that may reduce efficacy.
• Store at ambient temperature: keep below 25 °C, retain in original packaging, protect from moisture and direct sunlight.

Levonorgestrel may interact with other medicines that affect its metabolism or efficacy.

Major Interactions (Avoid)

• Rifampicin or other strong enzyme inducers: markedly reduce levonorgestrel levels.
• Carbamazepine, phenytoin, phenobarbital: decrease contraceptive effectiveness.
• St. John's wort: may lower drug exposure.

Moderate Interactions (Monitor Closely)

• Hormonal contraceptives: concurrent use may require additional barrier methods.
• Antiretroviral agents (e.g., efavirenz): may modestly reduce efficacy.
• Certain antibiotics (e.g., griseofulvin): potential reduction in plasma concentrations.
• Herbal supplements with enzyme‑inducing properties: monitor for breakthrough bleeding.