Doxycycline is an antibiotic that is used in the treatment of a number of types of infections caused by bacteria and protozoa. It is useful for bacterial pneumonia, acne, chlamydia infections, early Lyme disease, cholera and syphilis. It is also useful for the treatment of malaria when used with quinine and for the prevention of malaria. Doxycycline can be used either by mouth or intravenously.
Common side effects include diarrhea, nausea, vomiting, a red rash, and an increased risk of a sunburn. Use during pregnancy or in young children may result in permanent problems with the teeth including changes in their color.Its use during breastfeeding is probably safe. Doxycycline is a broad-spectrum antibiotic of the tetracycline class. Like other agents of this class it kills bacteria and protozoa by inhibiting protein production.