Isotretinoin is a powerful medication primarily used to treat severe acne that hasn't responded to other treatments. It works by reducing the amount of oil produced by the skin's sebaceous glands, helping to prevent clogged pores and reduce inflammation. This medication is a derivative of vitamin A and is usually taken in pill form. Due to its potential side effects, including dry skin and increased sensitivity to sunlight, it is important for patients to be closely monitored by a healthcare professional during treatment.