Doxycycline is a tetracycline antibiotic that works by inhibiting protein synthesis in bacteria, preventing their growth and reproduction. It is used to treat a wide range of bacterial infections, including respiratory tract infections (such as pneumonia and bronchitis), urinary tract infections, acne, and sexually transmitted infections like chlamydia, gonorrhea, and syphilis. It is also effective against typhoid fever and tick-borne diseases such as Lyme disease and Rocky Mountain spotted fever. Commonly prescribed for malaria prevention in travelers. Used in veterinary medicine for treating infections in animals. Has anti-inflammatory properties that make it useful in managing periodontal disease and certain chronic inflammatory conditions.