Cephalexin is used to treat a wide variety of bacterial infections. Learn about side effects, drug interactions, dosages, warnings, and more. Overview: Cephalexin is antibiotic that is used to treat infections caused by certain bacteria. It blocks the bacteria's ability to make their cell wall, which they need to survive. Common side. Easy-to-read patient tips for cephalexin covering how it works, benefits, risks, and best practices. Cephalexin is a type of cephalosporin antibiotic that treats bacterial infections. You can take this medication by mouth at the same time every day and follow the instructions on the label. Learn about cephalexin usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Cephalexin oral capsule is a prescription drug used for certain bacterial infections. Learn about side effects, uses, dosage, and more. Find drug information for Cephalexin on CVS.com, including related drug classes, side effects, dosage, and answers to frequently asked questions. Cephalexin is a cephalosporin (SEF a low spor in) antibiotic. It works by fighting bacteria in your body. Cephalexin is used to treat infections caused by bacteria, including upper respiratory infections, ear infections, skin infections, urinary tract infections and bone infections. Cephalexin is used to treat bacterial infections in many different parts of the body (eg, bones, ears, lungs, skin, urinary tract). Cephalexin belongs to the group of medicines known as cephalosporin antibiotics. Cephalexin treats infections like strep throat, UTIs, and skin infections. Learn how it works, common dosages, and what side effects to watch out for.