Doxycycline monohydrate is a broad-spectrum antibiotic used to treat a wide range of bacterial infections, from acne and chlamydia to respiratory infections and tick-borne diseases like Rocky Mountain spotted fever. Learn about doxycycline monohydrate usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Doxycycline monohydrate 100 mg is a widely prescribed oral antibiotic in the tetracycline family, used to treat infections ranging from acne and respiratory illness to tick-borne diseases, sexually transmitted infections, and malaria prevention. Doxycycline Monohydrate package insert / prescribing information for healthcare professionals. Includes: indications, dosage, adverse reactions and pharmacology. Doxycycline is a tetracycline antibiotic that inhibits bacterial growth and is thought to have anti-inflammatory effects. Doxycycline is used for bacterial infections, including acne, rosacea, urinary and respiratory tract infections, eye infections, gum disease, gonorrhea, chlamydia, and syphilis. Doxycycline is used to treat bacterial infections in many different parts of the body. It is also used to treat pimples and abscesses (usually on the face) that are caused by rosacea, also known as acne rosacea or adult acne. Find patient medical information for Doxycycline on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings.