Levonoraristo (Levonorgestrel)

Levonorgestrel is a progestogen used in reproductive health to prevent pregnancy.

• Emergency contraception: provides a high dose to inhibit ovulation and prevent implantation when taken within 72‑120 hours after unprotected intercourse.
• Regular contraceptive use: taken on a scheduled basis to suppress ovulation and maintain contraceptive protection for women seeking ongoing birth control.
• Prevention of pregnancy after contraceptive failure: used as a backup method when a primary contraceptive method fails or is missed, reducing the risk of unintended pregnancy.

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

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

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Headache: transient cranial discomfort.
• Breast tenderness: temporary sensitivity or swelling.
• Irregular bleeding: spotting or changes in menstrual flow.
• Abdominal pain: mild cramping or discomfort.
• Fatigue: feeling unusually tired.

Serious or Rare Side Effects

• Thromboembolic events: blood clot formation in veins or arteries.
• Severe allergic reaction: rash, swelling, or anaphylaxis.
• Liver dysfunction: abnormal liver enzyme levels or hepatitis.
• Pregnancy despite use: if implantation has already occurred.
• Ectopic pregnancy: implantation outside the uterus, requiring urgent care.

Before using Levonoraristo, consider the following safety measures.

• Timing of administration: take as soon as possible after unprotected intercourse for maximum effectiveness.
• Hypersensitivity: avoid if you have a known allergy to levonorgestrel or any excipients.
• Enzyme‑inducing drugs: concurrent use of strong inducers may lower efficacy; consult a healthcare professional.
• Routine contraception: do not replace regular contraceptive methods without medical advice.
• Store at ambient temperature: keep in the original packaging, protect from moisture and heat.

Levonorgestrel may interact with other medicines, affecting its efficacy or safety.

Major Interactions (Avoid)

• Rifampin and other strong enzyme inducers: can markedly reduce contraceptive effectiveness.
• Anticonvulsants such as phenytoin or carbamazepine: may lower plasma levonorgestrel levels.

Moderate Interactions (Monitor Closely)

• Antifungal azoles (e.g., ketoconazole): may increase levonorgestrel concentrations.
• St. John’s wort: a herbal inducer that can diminish effectiveness.
• Combined hormonal therapies: may produce additive hormonal effects; monitor for side‑effects.