Doxycycline monohydrate 100 mg is a broad-spectrum antibiotic most commonly used to treat a variety of bacterial infections, including respiratory infections like <strong data-start="144" data-end="157">pneumonia and <strong data-start="162" data-end="176">bronchitis, <strong data-start="178" data-end="186">acne, <strong data-start="188" data-end="201">chlamydia, <strong data-start="203" data-end="216">gonorrhea, <strong data-start="218" data-end="240">malaria prevention, and <strong data-start="246" data-end="262">Lyme disease. It is also used to treat <strong data-start="289" data-end="324">urinary tract infections (UTIs), <strong data-start="326" data-end="352">rickettsial infections (like <strong data-start="359" data-end="391">rocky mountain spotted fever), and <strong data-start="398" data-end="421">periodontal disease. Doxycycline is effective against both <strong data-start="461" data-end="478">gram-positive and <strong data-start="483" data-end="509">gram-negative bacteria and works by inhibiting bacterial protein synthesis. It is also used for <strong data-start="583" data-end="608">prevention of malaria in travelers to areas where the disease is prevalent. It is available in oral and intravenous forms.