Zithromax contains the active ingredient azithromycin, which is a type of medicine called a macrolide antibiotic. Azithromycin works by preventing bacteria from producing proteins that are essential to them.
Minocycline is a type of antibiotic called a tetracycline. It is used to treat infections caused by bacteria. The active ingredient, minocycline, works by interfering with the ability of bacteria to produce proteins that are essential to them.
Keflex (Cephalexin) is a drug that fights bacteria in the body. Its active ingredient is cefalexin and belongs to the class of cephalosporins. The medication kills bacteria and inhibits the growth of these micro-organisms.