The first time I went on met in 2000, I had the bathroom camping for weeks, This time I was wary of it though. The day Before I started the met this time I took an iron pill, and take one with the met every night with dinner. I am only at 500 mg so far, and it has only been a week, but no problems so far.
I think the reason this is working is because I started the iron in advance, so it had time for my body to be effected by it BEFORE the met got to me... and I normally find iron a bit constipating. If you find iron loosens you, do not try this.
I am not sure it would work if you already have the diarrhea, because it would go through you too fast to work, so You mihgt want to take a 24 hour holiday from the met, and try it on a more settled tummy.
I Thought on this a long time because I know taking immodium long term is not a healthy option. I also cut down on my vit C caps, because they can cause looseness too. And taking it with a decent size meal helps too.
But so far so good, I have not had to run to the bathroom once. I occasionally get a little tummy upset that feels like it might be coming on, but nothing so far
I hope this helps you ladies camping in the bathroom is NOT fun. Nor is the soreness that you get from weeks of it.
preventing diarrhea with iron 
