Isolox 20mg Tablet contains isotretinoin, a retinoid derivative primarily indicated for the treatment of severe recalcitrant nodular acne that has not responded to conventional therapies including antibiotics. Isotretinoin acts by reducing sebaceous gland size and sebum production, inhibiting the growth of acne-causing bacteria, and exhibiting anti-inflammatory properties. This medication is administered orally, with the dosage tailored according to the patient's weight and clinical response, typically ranging from 0.5 to 1 mg/kg/day. Due to its potent teratogenic effects, Isolox 20mg must be prescribed with strict adherence to pregnancy prevention programs, including mandatory negative pregnancy tests before initiation and throughout treatment in females of childbearing potential. Common adverse effects include cheilitis, dry skin, and mucous membrane dryness, while more serious but less frequent side effects may involve elevated liver enzymes, hyperlipidemia, and mood alterations. Regular monitoring of liver function tests, lipid profiles, and complete blood counts is recommended during therapy. Patients should avoid excessive sun exposure and use appropriate skin moisturizers. Isolox 20mg should be used under the supervision of a dermatologist or healthcare professional experienced in isotretinoin therapy to ensure safe and effective management of severe acne.