According to Drugs.com, Cephalexin is an oral antibiotic, which is used to fight and treat bacterial infections in the body. Cephalexin is included in a group of drugs known as cephalosporin antibiotics and may cause an allergic reactions in individuals with an allergy to other drugs in the cephalosporin family.
WebMD lists some specific bacterial infections that Cephalexin treats including Strep throat, tonsillitis and bacterial ear infections. Bacterial pneumonia, urinary tract infections, skin infections and bone infections are also treated with this medicine. In some cases this antibiotic is used to prevent bacterial infections of heart valves and breasts. It may also be used to prevent and treat infections of the feet for those suffering from diabetes.
Medicine.net explains that these antibiotics work by slowing and/or stopping the growth of certain bacteria cells. This is done by preventing the bacteria from forming a cell wall which surrounds each cell of bacteria. This wall is designed to protect the bacteria from the external environment and helps to keep the content of the cell together. Without this cell wall, bacteria can't survive. Cephalexin is available by prescription only and a generic version of the medicine is available. According to Drugs.com, this medicine is available in tablet and liquid form.