Used to treat a wide range of bacterial infections, including respiratory tract infections, urinary tract infections, acne, and certain sexually transmitted infections. Also effective in treating tick-borne diseases like Lyme disease and Rocky Mountain spotted fever. Commonly prescribed for malaria prevention in travelers. Used in managing ocular rosacea and periodontal disease due to its anti-inflammatory properties. Employed in veterinary medicine for treating infections in animals. Sometimes used off-label for conditions involving matrix metalloproteinase inhibition, such as corneal ulcers.