Doxycycline monohydrate 100 mg is a widely used oral antibiotic that helps treat moderate to severe acne by targeting the bacteria Cutibacterium acnes, which contributes to inflammation and breakouts. It also has anti-inflammatory properties that reduce redness and swelling, making it especially effective for inflammatory acne like pustules and cysts. Typically prescribed for several weeks to months, Doxycycline is often combined with topical treatments for optimal results. While effective, it can cause side effects such as sun sensitivity or stomach upset. Always follow your healthcare provider’s instructions to ensure safe, effective treatment and prevent antibiotic resistance.