Homepharmacology All are non OTC drugs except.. Bisacodyl publisher :NIL NAM -May 23, 2017 All are non OTC drugs except: a- Bisacodyl.*** b- Metformin. c- Phenytoin. d- Carbamazepine. Labels pharmacology Facebook Twitter Share:All are non OTC drugs except.. Bisacodyl Facebook Twitter WhatsApp Pinterest LinkedIn Reddit Tumblr Telegram Email