Hi 9Ball, I don't know what other conditions your father may have, but a dr. may not prescribe Questran for him if he has some conditions or certain other meds. My mother and I both had our GB out 15 yrs. ago. We both had a terrible time with the big D, my dr gave me Questran, what a difference. I told my mother and her dr. gave it to her, it didn't work. She also continued to eat junk, and paid for it. The past yr her D has gotten even worse, her Cardio dr. said he DID NOT want her on Questran it could cause her big time problems. Not long ago she was also dx w/ AD. She still has the prob w/ D on occassions. But she has so many health issues and meds they all seem to work against her stomach sometimes. I originally used Questran, but for a long time I've used Questran Light. If you do get it for your father, you can mix the powder w/ water or OJ, BUT you must have a least another full glass of water after it. It does work for most ppl. Hope it can work for your father. Have a good day. God bless. Alice.