Doxycycline Hydrochloride is a member of the tetracycline antibiotics group, and is commonly used to treat a variety of infections. Doxycycline is a semisynthetic tetracycline invented and clinically developed in the early 1960s by Pfizer Inc. and marketed under the brand name Vibramycin. Vibramycin received U.S. Food and Drug Administration (FDA) approval in 1967, becoming Pfizer's first once-a-day, broad-spectrum antibiotic. Other brand names include Monodox, Microdox, Periostat, Vibra-Tabs, Oracea, Doryx, Vibrox, Adoxa, Doxyhexal, Doxylin, Doxoral,Doxy-1 and Atridox (topical doxycycline hyclate for periodontitis).