Doxytreat LB 100 mg. Capsules are combination medications used to treat a variety of bacterial illnesses. Doxytreat LB 100 mg. Capsule is a versatile antibiotic that can cure a wide range of bacterial illnesses. These include infections in the blood, brain, lungs, bones, joints, urinary tract, stomach, and intestines. It can also be used to treat sexually transmitted infections. It inhibits the growth of the bacteria that causes the infection and clears it. It also helps cure and prevent diarrhea caused by this medication or stomach/gut (intestine) illnesses. Take it for the duration advised by your doctor, and avoid skipping doses. This will ensure that all bacteria are eliminated and do not develop resistance.