Nomegestrol Sandoz (Nomegestrol Acetate)

Nomegestrol acetate is used in hormonal pathways that regulate the menstrual cycle and reproductive function.

• Contraception: Provides progestin‑only oral contraception by suppressing ovulation and altering cervical mucus.
• Menstrual disorders: Relieves irregular bleeding and endometrial instability associated with dysfunctional uterine bleeding.
• Hormone replacement therapy: Supplies progestogenic support in combined estrogen‑progestogen regimens for menopausal symptom management.

• Nomegestrol acetate is a synthetic progestin that binds with high affinity to progesterone receptors in the hypothalamus, pituitary and endometrium. Receptor activation inhibits the luteinizing hormone surge, preventing follicular rupture and ovulation. In the endometrium it induces a secretory transformation and stabilises the lining, while also thickening cervical mucus to impede sperm penetration. These combined actions produce effective contraceptive and therapeutic effects.

Nomegestrol acetate may be associated with a range of adverse reactions, varying in frequency and severity.

Common Side Effects

• Headache: mild to moderate intensity, often transient.
• Nausea or abdominal discomfort: gastrointestinal upset that usually resolves.
• Breast tenderness: mild swelling or soreness.
• Irregular menstrual bleeding: spotting or changes in cycle length.

Serious or Rare Side Effects

• Venous thromboembolism: deep vein thrombosis or pulmonary embolism, requiring immediate medical attention.
• Severe allergic reaction: rash, itching, swelling, or anaphylaxis.
• Liver dysfunction: abnormal liver enzymes or jaundice.

When prescribing Nomegestrol acetate, clinicians should consider several precautionary measures to ensure safe use.

• Assess cardiovascular risk: evaluate history of thrombosis, smoking and hypertension.
• Review hepatic function: avoid use in patients with active liver disease.
• Monitor menstrual patterns: counsel patients about possible changes in bleeding.
• Consider bone health: prolonged use may affect bone mineral density in some women.
• Evaluate drug interactions: check concomitant use of enzyme‑inducing agents.
• Store at ambient temperature: keep tablets below 25 °C in the original packaging, protected from moisture.

Nomegestrol acetate can interact with other medicines, altering its effectiveness or safety profile.

Major Interactions (Avoid)

• Strong CYP3A4 inducers (e.g., rifampicin, carbamazepine): may reduce contraceptive efficacy.
• Antifungal azoles (e.g., ketoconazole): can increase plasma levels, raising risk of side effects.

Moderate Interactions (Monitor Closely)

• Anticoagulants (e.g., warfarin): may enhance anticoagulant effect, requiring INR monitoring.
• Antidiabetic agents: progestins can affect glucose control, necessitating dose adjustments.
• Certain antibiotics (e.g., griseofulvin): may modestly decrease hormone levels.