Which stone is common in chronic laxative use:: (A) Xanthine, (B) Cysteine, (C) Ammonia urate, (D) Struvite
Answer is C. Ans. c. Ammonia urateRef: Campbells Urology/P. 210Chronic laxative use leads to decreased sodium in the urine, as most sodium is excreted by GIT.Hence urate binds more with ammonia and this leads to ammonia urate stones.