I was prescribed Lamisil for toenail fungus for a period of 90 days. After 60 days I started having really bad diarrhea. I was away on vacation in another country and thought I had picked up a parasite as I was in bed for a week after I got home. Multitudes of stool samples, blood work, scoping, and CT scans have revealed no physical issues, however.
I tried a number of diets (IBS, dairy free, gluten free, etc.) with no results. Probiotics did nothing. After 18 months I was finally prescribed Asacol for the inflammation caused (normally) by ulcerative colitis. I am into the third week of 800 mg twice a day and have just experienced the first consecutive five days of feeling better. I was going to the bathroom three or four times during the night and had lost 10 pounds (which I can ill afford as I am already naturally slim). Hope this post helps someone. My advice: Do not take Lamisil, if at all possible.