Isotroin 20 mg capsule contains the active ingredient isotretinoin. It is prescribed for severe acne (pimples) that has not responded to other treatments. Take the Isotroin 20 mg capsule as directed by your doctor. Avoid prolonged exposure to sunlight. Keep yourself hydrated by drinking plenty of water and fluids. Gently cleanse the face with a mild soap/facewash, avoid using oil-based or greasy cosmetics, and avoid rubbing, scratching, or squeezing pimples. Before taking Isotroin capsules, tell your doctor if you are pregnant, planning to have a baby, or are breastfeeding, as well as your complete medical history.