Doxycycline kills certain bacteria that cause infection, or stops their growth.
It treats many kinds of infections of the skin, bone, stomach, respiratory tract, sinuses, ear, and urinary tract. It also treats Lyme disease and certain sexually transmitted diseases. For travelers to certain areas doxycycline can be given to suppress malaria. Generic doxycycline tablets and capsules are available. Take doxycycline tablets or capsules by mouth.