The fiber I take is any fiber that is OTC. I bought mine at CVS, their brand. I asked the pharmacist about the best one. I take 1 tablet a day. It firms things up with no side effects. As far as the Lomotil is concerned, I took 4 per day since my take-down in 1990. Apparently, that wasn't enough to slow my system down. The older I got the more frequent the BM's became. So, the surgeon said he has several patients who take as many as 8 per day of Lomotil and they do fine. He said I can even supplement it with Immodium. I want to tell you it's been like a miracle and NO side effects from this dosage and the BM's are almost like someone without a J-Pouch (I exaggerate a bit). My quality of life has improved. Now I can go to golf tournaments and play golf without the fear of not being able to find a bathroom. It is important for me to state though that this does not prevent me from a Crohns attack. I have been on a combination of Flagyl and CIPRO for 5 weeks and the bleeding has stopped and I am feeling a lot better.
BY the way, the reason I went to see the surgeon in the first place is to see if my pouch was still sound and find out why I had such constant big amount of pain and burning in the rectal area. With the reduced number of BM's, no more pain there because of less acid irritation. Too bad some are having problems with Lomotil and Immodium. For me, it's a miracle drug.
I hope my story helps someone else. Here's to your good health and happiness.