Marvelon (Desogestrel, Ethinylestradiol)

• Marvelon, a combined oral contraceptive, acts on the hormonal regulation pathway to prevent pregnancy.
• Pregnancy prevention: Provides reliable contraception for women of childbearing potential.

• Desogestrel/Ethinylestradiol works by suppressing the hypothalamic‑pituitary‑ovarian axis, inhibiting the mid‑cycle surge of luteinizing hormone (LH) and follicle‑stimulating hormone (FSH). This prevents ovulation. Ethinylestradiol stabilizes the endometrial lining, while desogestrel induces changes in cervical mucus that reduce sperm penetration, together creating multiple barriers to fertilization and implantation.

Oral contraceptives may cause a range of adverse reactions, varying in frequency and severity.

Common Side Effects

• Nausea: mild stomach upset, often transient.
• Breast tenderness: discomfort or swelling of the breasts.
• Headache: mild to moderate intensity.
• Weight gain: slight increase in body weight.
• Mood changes: irritability or mood swings.
• Breakthrough bleeding: spotting between periods.

Serious or Rare Side Effects

• Venous thromboembolism: blood clots in deep veins or lungs.
• Arterial thrombosis: clot formation in arteries, potentially causing stroke or heart attack.
• Hypertension: significant increase in blood pressure.
• Liver disorders: jaundice or hepatic dysfunction.
• Severe allergic reactions: rash, swelling, or anaphylaxis.
• Visual disturbances: sudden vision loss or blurred vision.

• Before prescribing Marvelon, clinicians should evaluate several safety considerations to minimize risk.
• Smoking: Avoid use in women over 35 who smoke, due to increased cardiovascular risk.
• Cardiovascular disease: Contraindicated in patients with a history of myocardial infarction, stroke, or uncontrolled hypertension.
• Thromboembolic history: Not recommended for individuals with prior deep‑vein thrombosis or pulmonary embolism.
• Liver disease: Use with caution in patients with active liver disease or impaired hepatic function.
• Migraine with aura: Contraindicated in women experiencing migraine headaches accompanied by visual or sensory aura.
• Store at ambient temperature: Keep below 25 °C, in the original packaging, protected from moisture and light.

Marvelon can interact with other medicines, altering its effectiveness or increasing adverse effects.

Major Interactions (Avoid)

• Enzyme inducers (e.g., rifampicin, carbamazepine, phenytoin): reduce contraceptive efficacy.
• Certain antiretrovirals (e.g., efavirenz, nevirapine): may lower hormone levels.
• St. John’s wort: potentiate hepatic metabolism, decreasing effectiveness.

Moderate Interactions (Monitor Closely)

• Antifungals (e.g., ketoconazole, itraconazole): may increase hormone concentrations.
• Selective serotonin reuptake inhibitors (SSRIs): occasional alteration of hormone levels.
• Antihypertensives (e.g., beta‑blockers, ACE inhibitors): may require dose adjustment.
• Diuretics: potential for electrolyte imbalance.
• Antiepileptics (e.g., valproate): may affect hormone metabolism.