Clindamycin 300mg Injection is an antibiotic medicine that fights bacteria and is used to treat a wide variety of bacterial infections. It is effective in infections of the lungs (eg. pneumonia), stomach, skin & soft tissues, bones & joints, blood, and heart. Clindamycin 300mg injection is given as a drip (intravenous infusion) or as an injection directly into a vein or a muscle under the supervision of a healthcare professional. The most common side effects of this medicine include pseudomembranous colitis, diarrhea, abdominal pain, maculopapular rash, thrombophlebitis, and abnormal liver function test.