Acetylsalicylic Acid is used for the treatment of fever as well as inflammation and pain caused by various conditions such as arthritis, menstrual pain, headache, migraines, muscle pain, burns, toothache, and the common cold. This medicine is also used to treat or prevent heart attacks and strokes. It works by interfering with the production of certain natural substances in the body that cause fever, inflammation, pain, and blood clots. This medicine may also be used to treat other conditions as determined by your doctor.