Thanks for the query. Faceclin is composed of two primary ingredients- Cindamycin & Nicotinamide. The first is a antibiotic and second belongs to Vitamin b complex group. Faceclin A is composed of clindamycin and adapelene. Clindamycin is an antibiotic as already mentioned and Adapelene belongs to a class of medications called as retinoid-like compounds. It exhibits an anti-inflammatory effect and reduces soreness and irritation. Adapelene is advised at night time application as Sunlight may cause photosensitive reaction and burning. Have patience and continue treatment. Hope it helps you. Dr MK Agarwala