irritable bowel syndrome
"I took 10 mg of Bentyl, even though my doc said to take 20mg. Yes, it took care of the abdominal cramps, but I got a bad headache, dry mouth and eyes, & dizziness. I also got pain in my thigh and tingling in the same leg where I have nerve issues because of a herniated disc. This also caused neck pain where I have nerve issues as I took only 5 mg 20 hrs later when I could feel the cramping coming back. The side effects were there, but to a lesser degree. The most disturbing side effect was my heart rate dropped to 45;  it's usually in the low 60's, and blood pressure went up. Not sure I can continue on this medication, perhaps only when I feel cramping coming on and no more than 5 mg."