Levodonna (Levonorgestrel)

Levonorgestrel acts on the hormonal pathway that regulates ovulation and endometrial development, providing contraceptive protection.

• Emergency contraception: prevents pregnancy when taken within 72 hours after unprotected sex.
• Regular hormonal contraception: maintains contraceptive efficacy when used on a scheduled daily basis.
• Post‑coital contraceptive failure: provides backup protection if another contraceptive method fails.

• Levonorgestrel is a synthetic progestogen that 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, making it less permeable to sperm, and alters the endometrial lining, reducing the likelihood of implantation should fertilization occur. These combined actions ensure that ovulation does not occur and that any fertilized egg cannot successfully implant.

Levonorgestrel may cause a range of adverse reactions, varying from mild to serious.

Common Side Effects

• Nausea: mild stomach upset often occurring shortly after ingestion.
• Headache: transient tension‑type headaches.
• Breast tenderness: temporary swelling or discomfort of the breasts.
• Menstrual changes: spotting, irregular bleeding or delayed periods.

Serious or Rare Side Effects

• Allergic reaction: rash, itching, swelling, or difficulty breathing.
• Severe abdominal pain: may indicate ectopic pregnancy.
• Chest pain or shortness of breath: possible thromboembolic event.
• Liver dysfunction: jaundice or abnormal liver enzymes (rare).

When prescribing Levonorgestrel, clinicians should consider several safety precautions to minimize risk.

• Pregnancy contraindication: do not use in confirmed pregnancy.
• Liver disease: use with caution in patients with severe hepatic impairment.
• Thromboembolic risk: avoid in individuals with a history of blood clots.
• Hormone‑sensitive cancers: contraindicated in active breast cancer.
• Hypersensitivity: discontinue if allergic reactions occur.
• Store at room temperature: keep in the original packaging, protect from moisture and direct sunlight.

Levonorgestrel can interact with other medicines that affect its metabolism or hormonal activity.

Major Interactions (Avoid)

• Rifampin and other strong enzyme inducers: markedly reduce contraceptive effectiveness.
• St. John’s wort: may decrease plasma levels, compromising efficacy.
• Anticonvulsants such as phenytoin or carbamazepine: lower hormone concentrations.

Moderate Interactions (Monitor Closely)

• Combined hormonal contraceptives: may increase risk of hormonal side‑effects.
• Antiretroviral drugs (e.g., efavirenz): may modestly reduce effectiveness.
• Herbal supplements like ginkgo biloba: potential additive bleeding risk.