Imatin-400 Tablet is a medication used to treat various cancers, including blood and gastrointestinal stromal tumors. It targets specific proteins that contribute to cancer cell growth and spread. It is also used for skin tumors like dermatofibrosarcoma protuberans and aggressive systemic mastocytosis. The medication should be taken with food and continued as directed by the doctor. Common side effects include edema, nausea, vomiting, muscle cramps, musculoskeletal pain, diarrhea, rash, fatigue, and abdominal pain. It is not recommended during pregnancy or breastfeeding, and effective contraception is essential to avoid pregnancy.