Pharmacology Gastrointestinal tract e3e8bc74 Which of the following drug cause the following effect? (colonoscopic view) A Senna B Bisacodyl C Bismuth D Aluminium Hydroxide High-Yield Explanation Bismuth cause tongue and stool discoloration. Senna(irritant purgative) cause colon pigmentation - melanosis coli. ref: katzung 12th ed