I had watery diarrhea beginning June 22nd for which I went to Urgent Care. I believed I had a cyclospora parasite infection and they agreed it was likely - there was an outbreak in my state. Unfortunately, the APRN there didn't realize the test for cyclospora is a separate stool test and she gave me the standard test, so the tests came back "not detected" for the 6 parasites tested. She also prescribed Bactrim which made me feel better in 24 hours, but did not stop the diarrhea. Bentyl helped a bit, but nothing - not Pepto, lomotil, several differnt probiotics, antihistamine, activated charcoal or Metamucil helped - until I found a reference to arsenicum album on the Mount Sinai homeopathy website. Within 24 hours the watery diarrhea was gone. I'm not typically a "homeopathy person", but it has been a dramatic change. With no side effects. I bought mine from Amazon. Boiron is the brand - the blue one - 30C. Not saying it will help everyone, but it's been a dramatic change. At $15+ it's worth a try. I thought I would never be normal again.