Cephalexin treats infections like strep throat, UTIs, and skin infections. Learn how it works, common dosages, and what side effects to watch out for. Cephalexin is used to treat a wide variety of bacterial infections. Learn about side effects, drug interactions, dosages, warnings, and more. To reduce the development of drug-resistant bacteria and maintain the effectiveness of cephalexin and other antibacterial drugs, cephalexin capsules should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. Cephalexin may be used to treat respiratory tract infections including those in the chest, tonsils, throat or lungs. You may also be prescribed this drug to assist in curing infections of the skin, ears, sinuses or genitourinary tract, which included the bladder, prostate and kidneys. Find patient medical information for Cephalexin (Keflet, Keflex, Keftab) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Compare prices and print coupons for Cephalexin at CVS, Walgreens, and other pharmacies to save on your prescription. Cephalexin is used to treat bacterial infections in many different parts of the body. It belongs to the class of medicines known as cephalosporin antibiotics. It works by killing bacteria or preventing their growth. However, this medicine will not work for colds, flu, or other virus infections. 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 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 500 mg is considered a moderate-strength antibiotic that works well for many common bacterial infections. It belongs to the cephalosporin family and packs enough punch for most routine infections while causing fewer side effects than some stronger options.