Doxycycline is a tetracycline antibiotic. It works by slowing the growth of bacteria in the body.

Doxycycline is used to treat many different bacterial infections, such as urinary tract infections, acne, gonorrhea, and chlamydia, periodontitis (gum disease), and others. It may be used in combination with other medicines to treat certain amoeba infections.

Doxycycline may also be used for other purposes not listed in this medication guide.