doxycycline, doxycycline hyclate, infectious disease, Acne, Actinomycosis, Acute intestinal amebiasis, Anthrax, Cholera, Clostridium, Gram-negative infections, Gram-positive infections, Listeriosis, Malaria, Mycoplasma pneumoniae, Ophthalmic infections, Relapsing fever, Respiratory tract infections, Rocky Mountain spotted fever, typhus fever and the typhus group, Q fever, rickettsialpox, and tick fevers caused by Rickettsiae, Chlamydia, chancroid, nongonococcal urethritis, uncomplicated gonorrhea, syphilis, Vincent infection, Yaws, psittacosis, plague, tularemia, brucellosis, bartonellosis, infection, antibiotic, bacteria, bacterial infection, tetracycline