Iren (Drospirenone, Ethinylestradiol)

• Iren, a combined oral contraceptive, acts on the hormonal regulation pathway to prevent pregnancy.
• Prevention of pregnancy: provides reliable contraceptive protection for women of childbearing potential.
• Menstrual cycle regulation: helps establish regular menstrual bleeding patterns.
• Moderate acne treatment: may improve acne associated with hormonal fluctuations.

• Drospirenone acts as a progestogenic agent that suppresses luteinizing hormone (LH) and follicle‑stimulating hormone (FSH) release, preventing ovulation. Ethinylestradiol provides estrogenic activity, stabilizing the endometrial lining and enhancing cervical mucus viscosity, together creating an environment unsuitable for fertilization and implantation.

Iren may cause a range of adverse reactions, which are grouped by frequency.

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Breast tenderness: discomfort or swelling of the breasts.
• Headache: occasional tension‑type headache.
• Spotting or breakthrough bleeding: irregular light bleeding.
• Mood changes: irritability or mild mood swings.
• Weight fluctuation: slight increase in body weight.

Serious or Rare Side Effects

• Venous thromboembolism: deep vein thrombosis or pulmonary embolism.
• Arterial thrombosis: stroke or myocardial infarction.
• Severe hypertension: sudden high blood pressure.
• Liver disorders: jaundice or hepatic dysfunction.
• Gallbladder disease: gallstones or cholecystitis.
• Anaphylaxis: severe allergic reaction requiring immediate medical attention.

• Before prescribing Iren, clinicians should consider several safety factors.
• Pregnancy contraindication: do not use in women who are or may become pregnant.
• Smoking over age 35: avoid in women who smoke cigarettes and are older than 35 years.
• History of thromboembolism: contraindicated in patients with prior clotting events.
• Liver disease: use with caution in hepatic impairment.
• Hypertension: monitor blood pressure regularly.
• Store at ambient temperature: keep below 25 °C, in original packaging, protected from moisture and light.

Iren can interact with other medicines, affecting its efficacy or safety.

Major Interactions (Avoid)

• CYP3A4 inducers (e.g., rifampin, carbamazepine): reduce contraceptive effectiveness.
• Antifungal agents (e.g., ketoconazole, itraconazole): increase hormone levels, raising side‑effect risk.
• St. John’s wort: may diminish contraceptive protection.
• Certain antibiotics (e.g., griseofulvin): may lower plasma hormone concentrations.

Moderate Interactions (Monitor Closely)

• SSRIs (e.g., fluoxetine): may increase bleeding tendency.
• Antihypertensives (e.g., ACE inhibitors): monitor blood pressure for additive effects.
• Antidiabetic drugs (e.g., metformin): observe glucose control as hormones can affect insulin sensitivity.