Ospen (Drospirenone, Ethinylestradiol)

Ospen is a hormonal contraceptive that acts on the reproductive endocrine system.

• Contraception: Prevents ovulation and thereby avoids pregnancy.
• Menstrual cycle regulation: Provides more predictable bleeding patterns.
• Acne management: Reduces androgen‑driven skin lesions in some women.

• Drospirenone is a synthetic progestogen with antimineralocorticoid activity, and ethinylestradiol is a synthetic estrogen. Together they bind to progesterone and estrogen receptors, suppressing the hypothalamic‑pituitary‑gonadal axis, inhibiting the luteinizing hormone (LH) and follicle‑stimulating hormone (FSH) surge, which blocks ovulation. The combination also thins the endometrial lining and thickens cervical mucus, creating multiple barriers to fertilisation.

Side effects vary in frequency and severity.

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Headache: tension‑type or migraine‑like pain.
• Breast tenderness: temporary swelling or discomfort.
• Weight change: slight fluid‑related gain or loss.
• Mood changes: irritability or emotional lability.
• Spotting: breakthrough bleeding between periods.

Serious or Rare Side Effects

• Venous thromboembolism: deep‑vein thrombosis or pulmonary embolism.
• Arterial thrombosis: stroke or myocardial infarction.
• Hypertension: new‑onset high blood pressure.
• Severe liver dysfunction: jaundice or abnormal liver enzymes.
• Allergic reaction: rash, itching, swelling, or anaphylaxis.
• Gallbladder disease: inflammation or stones.

Before starting Ospen, consider the following safety points.

• Smoking status: avoid use if over 35 and a regular smoker.
• Cardiovascular risk: assess history of clotting, hypertension, or stroke.
• Liver function: evaluate for active liver disease.
• Migraine history: caution in women with migraine with aura.
• Pregnancy potential: discontinue if pregnancy is confirmed or suspected.
• Store at ambient temperature: keep below 25 °C, in original packaging, protected from moisture and light.

Ospen may interact with several medicines; monitoring is advised.

Major Interactions (Avoid)

• Antifungal azoles (ketoconazole, itraconazole): increase estrogen exposure.
• Antiretroviral protease inhibitors (ritonavir): raise plasma levels of both components.
• Enzyme‑inducing anticonvulsants (phenytoin, carbamazepine): reduce contraceptive effectiveness.

Moderate Interactions (Monitor Closely)

• St. John’s wort: may lower efficacy, consider alternative contraception.
• Antibiotics (rifampicin, rifabutin): possible reduction in hormone levels.
• Diuretics (spironolactone): additive antimineralocorticoid effect, monitor electrolytes.