Cephalexin (Keflex, Keftabs) is an an antibiotic used to treat bacterial infections of the sinuses, tooth, urinary tract, and throat. Common side effects of Keflex include diarrhea, nausea, abdominal pain, headaches, and vaginitis. Dosage of cephalexin depends on the type of infection. Keflex is a cephalosporin antibiotic prescribed to treat bacterial infections. Keflex is also used before dental procedures in patients identified with certain heart-related conditions to prevent bacterial infections of the heart known as endocarditis. Cephalexin is an antibiotic. It belongs to a group of antibiotics called cephalosporin antibiotics, which treat different types of bacterial infections. These include ear infections, respiratory. Compare prices and print coupons for Cephalexin (Generic Keftab, Keflet, and Keflex) and other Skin Infection, Ear Infection, Urinary Tract Infection, Bacterial Infection, Lower Respiratory Infection, and Upper Respiratory Infection drugs at CVS, Walgreens, and other pharmacies. Prices start at $6.76 KEFLEX® (cephalexin) Capsules. DESCRIPTION. KEFLEX® (cephalexin) Capsules, USP is a semisynthetic cephalosporin antibacterial drug intended for oral administration. 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. Respiratory Tract Infections. Cephalexin capsules are indicated for the treatment of respiratory tract infections caused by susceptible isolates of Streptococcus pneumoniae and Streptococcus pyogenes. Cefalexin, also spelled cephalexin, is an antibiotic that can treat a number of bacterial infections. It kills gram-positive and some gram-negative bacteria by disrupting the growth of the bacterial cell wall. Cefalexin is a beta-lactam antibiotic within the class of first-generation cephalosporins. It works similarly to other agents within. Cephalexin, an antibiotic in the cephalosporin family, is used to treat infections caused by bacteria. Cephalexin is prescribed to treat respiratory tract, middle ear, skin, bone, and urinary. Cephalexin comes as a capsule, tablet, and suspension (liquid) to take by mouth. It is usually taken with or without food every 6 or 12 hours for 7 to 14 days, depending on the condition being treated.