Dalacin C 300mg Capsule is an antibiotic medicine that fights bacteria and is used to treat a variety of bacterial infections. It is effective in infections of the lungs (eg. pneumonia), throat, stomach, skin and soft tissues, bones and joints, and teeth. Dalacin C 300mg Capsule works by stopping the growth of bacteria. The most common side effects of this medicine include stomach pain, nausea, vomiting, and diarrhea.