Levonorgestrel Lupin Healthcare (Uk) (Levonorgestrel)

Levonorgestrel is a synthetic progestogen used in hormonal contraceptive pathways. It provides the following clinical benefits:

• Emergency contraception: prevents pregnancy after unprotected intercourse when taken within the recommended time frame.
• Regular contraception: offers ongoing prevention of pregnancy when used as a scheduled hormonal method.
• Ovulation suppression: inhibits the release of an egg, reducing the chance of fertilisation.

• Levonorgestrel acts as a synthetic progestogen that binds to progesterone receptors in the hypothalamus and pituitary, suppressing the luteinising hormone surge and thereby inhibiting ovulation. It also induces changes in cervical mucus, making it less permeable to sperm, and alters the endometrial lining to reduce the likelihood of implantation.

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

Common Side Effects

• Nausea: mild to moderate upset stomach.
• Headache: occasional tension‑type headache.
• Abdominal pain: cramping or discomfort in the lower abdomen.
• Fatigue: feeling unusually tired.
• Breast tenderness: mild swelling or sensitivity.
• Menstrual changes: spotting or altered flow.

Serious or Rare Side Effects

• Thromboembolic events: blood clots in veins or arteries.
• Severe allergic reaction: rash, swelling, or anaphylaxis.
• Liver dysfunction: jaundice or abnormal liver enzymes.
• Ectopic pregnancy: implantation outside the uterus.
• Persistent abdominal pain: could indicate a serious condition.
• Severe vaginal bleeding: unexpected heavy bleeding.

Before using Levonorgestrel, consider the following safety measures:

• Assess medical history: evaluate for clotting disorders, cardiovascular disease, liver impairment, or hormone‑sensitive cancers.
• Review current medications: check for drugs that may reduce effectiveness, such as enzyme‑inducing anticonvulsants.
• Pregnancy testing: ensure the patient is not already pregnant before administration.
• Breastfeeding guidance: discuss potential effects with a healthcare professional.
• Follow‑up: advise patients to seek medical attention if they experience severe abdominal pain, unusual bleeding, or signs of a blood clot.
• Store at ambient temperature: keep below 25°C in the original packaging, protect from moisture and direct sunlight.

Levonorgestrel can interact with several medicines, affecting its efficacy or safety.

Major Interactions (Avoid)

• Enzyme‑inducing anticonvulsants (e.g., carbamazepine, phenytoin): may markedly reduce contraceptive effectiveness.
• Rifampicin or rifabutin: can lower plasma concentrations, increasing risk of unintended pregnancy.
• St. John’s wort: herbal inducer that may diminish hormonal activity.

Moderate Interactions (Monitor Closely)

• Azole antifungals (e.g., ketoconazole, itraconazole): may increase levonorgestrel levels, raising side‑effect risk.
• Macrolide antibiotics (e.g., erythromycin, clarithromycin): can modestly elevate hormone concentrations.
• Other hormonal therapies (e.g., estrogen‑containing products): may have additive effects on clotting risk.