Isotroin 20 mg capsule contains isotretinoin as its active ingredient. It is used to treat severe acne (pimples) that haven’t responded to other treatments. Take Isotroin 20 mg capsule as instructed by the doctor. Avoid being exposed to sunlight for too long. Drink plenty of water and fluids to keep yourself hydrated. Clean the face gently with a mild soap/facewash, limit the use of oil-based or greasy cosmetics and avoid rubbing, scratching or squeezing pimples.