Nomegestrol Eg (Nomegestrol Acetate)

• Nomegestrol Eg is a synthetic progestogen used in hormonal pathways related to contraception and menopause management.
• Contraception: prevents pregnancy by suppressing ovulation and inducing endometrial changes that inhibit implantation.
• Hormone replacement therapy: relieves menopausal symptoms such as hot flashes and prevents endometrial hyperplasia in estrogen‑treated women.

• Nomegestrol Acetate acts as an agonist at progesterone receptors, binding with high affinity to the intracellular receptor complex. This activation suppresses the hypothalamic‑pituitary‑gonadal axis, inhibiting the luteinizing hormone surge and thereby preventing ovulation. In the uterus, it induces secretory transformation of the endometrium, creating an environment unsuitable for implantation.

Nomegestrol Eg may cause a range of adverse reactions, most of which are mild and reversible.

Common Side Effects

• Headache: mild to moderate intensity.
• Nausea: occasional upset stomach.
• Breast tenderness: transient discomfort.
• Weight gain: modest increase in body weight.
• Mood changes: irritability or mild depression.
• Irregular bleeding: spotting or breakthrough bleeding.

Serious or Rare Side Effects

• Venous thromboembolism: deep vein thrombosis or pulmonary embolism.
• Hepatic dysfunction: elevated liver enzymes or jaundice.
• Severe allergic reaction: rash, swelling, or anaphylaxis.
• Depression: severe or persistent mood disorder.
• Hypertension: new‑onset high blood pressure.
• Uterine rupture: extremely rare, usually associated with uterine surgery.

• Before initiating therapy with Nomegestrol Eg, clinicians should evaluate individual risk factors and counsel patients on safe use.
• Assess thrombotic risk: avoid in patients with a history of venous thromboembolism.
• Evaluate liver function: monitor in patients with hepatic impairment.
• Monitor blood pressure: check regularly during treatment.
• Counsel on smoking cessation: smoking increases cardiovascular risk.
• Avoid use in pregnancy: contraindicated due to teratogenic potential.
• Store at room temperature: keep in the original pack, protect from moisture and direct sunlight.

Nomegestrol Eg can interact with other medicines that affect its metabolism or pharmacodynamic profile.

Major Interactions (Avoid)

• Strong CYP3A4 inducers (e.g., rifampicin, carbamazepine): may reduce contraceptive efficacy.
• Anticoagulants (e.g., warfarin): may alter anticoagulant control.
• HIV protease inhibitors: potential for reduced hormonal activity.

Moderate Interactions (Monitor Closely)

• Antifungals (e.g., ketoconazole, itraconazole): may increase plasma levels.
• Macrolide antibiotics (e.g., erythromycin): possible modest increase in hormone exposure.
• Antiepileptic drugs (e.g., phenytoin): may modestly decrease effectiveness.