Doxycycline is used in the treatment of bacterial infections, such as pneumonia and other respiratory tract infections. Doxycycline is also used to treat the Lyme disease, infections in the genital and urinary systems, anthrax and acne. In addition, Doxycycline can help prevent periodontal disease. Doxycycline is a prescription drug and is used under a doctor's directions. Doxycycline Monohydrate is indicated for the treatment of certain bacterial infections such as pneumonia. Doxycycline Monohydrate is also used to treat Lyme disease, infections on the skin and the urinary system as well as anthrax. Doxycycline Monohydrate may help prevent malaria as well. Doxycycline Monohydrate is in a group of medicines known as antibiotics. It works by inhibiting the activities and spread of bacteria. Doxycycline Monohydrate will not treat viral or fungal infections such the common cold or flu. Use Doxycycline Monohydrate as directed by the doctor. Misuse or unnecessary use of Doxycycline Monohydrate just like any other antibiotic will reduce its effectiveness.