Isokon 20mg Capsule contains isotretinoin, a retinoid derivative of vitamin A, primarily indicated for the treatment of severe recalcitrant nodular acne that is unresponsive to conventional therapies such as antibiotics and topical agents. Isotretinoin exerts its therapeutic effect by reducing sebaceous gland size and sebum production, inhibiting the growth of acne-causing bacteria, and exerting anti-inflammatory properties. Each capsule delivers 20mg of isotretinoin, administered orally, typically once or twice daily with food to enhance absorption. Treatment duration generally spans 15 to 20 weeks, depending on clinical response and physician assessment. Due to its potent teratogenicity, Isokon is contraindicated in pregnant women and requires strict adherence to pregnancy prevention programs during treatment and for at least one month post-therapy. Common adverse effects include cheilitis, dry skin, conjunctivitis, and transient elevations in liver enzymes and lipid profiles, necessitating regular monitoring of hepatic function and lipid levels. Patients should avoid excessive sun exposure and use moisturizers to mitigate mucocutaneous dryness. Isokon should be prescribed under specialist supervision with thorough patient counseling regarding potential risks, contraindications, and the importance of compliance with recommended monitoring protocols to ensure safe and effective use.