Diarrhea effect of Buscopan

For the second time, I had severe intestinal spasms (on the left side of the abdomen, cramps that kept coming and going). The first time I did a 5-day cleansing on a natural basis (minerals). That was good. Now I got the cramps 3 months later but again and drove to a hospital (live in England). The doctor prescribed Buscopan for me, of which I took 2 tablets right there. Since it was already in the middle of the night when I came home, I went to bed with pain and woke up without pain and had a bowel movement, which then became diarrhea. I could have done that with natural colon cleansing like last time, that would have been just as effective but healthier. Why do some chemicals in an already attacked body and accept side effects, if that’s the case? Now drink more water, eat more unspiced fruit / vegetables and hope that was the last time. Shortly before had fast food and stress. That’s probably not a good mix.