Aspirin is a medicine that relieves minor aches and pains and reduces fever. It is used for headaches, toothaches, muscle pain, menstrual cramps, joint pain from arthritis, and in adults for aches associated with colds and flu. Some people take aspirin daily to reduce the risk of stroke, heart attack, or other heart problems.

Aspirin, also known as acetylsalicylic acid, is sold over the counter and comes in many forms, from the familiar white tablets to chewing gum to rectal suppositories. Coated, chewable, buffered, and extended release forms are available. Many other over-the-counter combination medicines contain aspirin as one of their active ingredients.

Aspirin belongs to a group of drugs called salicylates. Other members of this group include sodium salicylate, choline salicylate, and magnesium salicylate. These drugs are more expensive and no more effective than aspirin. However, they are a little easier on the stomach. Aspirin is quickly...