Doxt-SL Capsule is used to treat bacterial infections such as urinary tract infections, intestinal infections, respiratory infections, eye infections, gum infections, and sexually transmitted infections. It contains Doxycycline and Lactic acid bacillus, which work by inhibiting the synthesis of essential proteins which are necessary for their survival, thereby killing the infection-causing bacteria. It also helps restore the balance of good bacteria in the gut. In some cases, this medicine may cause side effects such as nausea, vomiting, loss of appetite, and stomach upset.