Cephalexin oral capsule is a prescription drug used for certain bacterial infections. Learn about side effects, uses, dosage, and more. Find patient medical information for Cephalexin (Keflet, Keflex, Keftab) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Learn about the side effects of cephalexin, from common to rare, for consumers and healthcare professionals. Cefalexin, also spelled cephalexin, is an antibiotic that can treat a number of bacterial infections. [4] It kills gram-positive and some gram-negative bacteria by disrupting the growth of the bacterial cell wall. [4] 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 is used to treat a wide variety of bacterial infections. Learn about side effects, drug interactions, dosages, warnings, and more. Cephalexin is a cephalosporin antibiotic used to treat bacterial infections like respiratory, skin, ear, urinary tract, and bone infections in adults and children. Cephalexin is used to treat certain infections caused by bacteria. Cephalexin is in a class of medications called cephalosporin antibiotics. It works by killing bacteria. Antibiotics such as cephalexin will not work for colds, flu, or other viral infections. 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. Cephalexin is an antibiotic used to treat various infections, including strep throat and staph infections. The standard dose of cephalexin is highly dependent on patient characteristics and the type of infection being managed, but typical doses are 500 mg twice daily or 250 mg every six hours.