How Quickly Does Doxycycline Start Working? Doxycycline is an antibiotic that starts working soon after the first dose, but how quickly you notice results depends on the type of infection being treated. Once taken, doxycycline is absorbed into the bloodstream within a few hours and begins fighting bacteria right away. For some infections, such as acne, it may take several weeks of regular use before clear improvements are seen, since the medicine works gradually to reduce inflammation and bacteria on the skin. For bacterial infections like respiratory tract infections, urinary tract infections, or sexually transmitted infections, people may start to feel better within 2 to 3 days of starting treatment. It’s important to continue taking doxycycline for the full course prescribed, even if symptoms improve early. Stopping too soon can cause the infection to come back or lead to antibiotic resistance. Always follow your doctor’s instructions for the best results. For more info. visit : https://www.dosepharmacy.com/doxycycline-100mg-capsule