This is a combination of lincosamide antibiotic Clindamycin phosphate and retinoid Tretinoin. Clindamycin binds with the 50s ribosomal subunit of susceptible bacteria and prevents elongation of peptide chain by interfering with the peptidyl transfer, thereby suppressing bacterial protein synthesis. Clindamycin inhibits the activity of Propionibacterium acne as reduces the occurrence of acne. Tretinoin decreases the cohesiveness of follicular epithelial cells and increases the turn over thereby brings the comedones out.