Cephalexin is a prescription medication used to treat bacterial infections. Cephalexin belongs to a group of drugs called cephalosporin antibiotics, which kill the bacteria that lead to infections.

This medication comes in tablet, capsule, and oral suspension (liquid) forms. Cephalexin is taken up to 4 times a day with or without meals.

Common side effects of cephalexin include upset stomach, diarrhea, and vomiting.