Dicyclomine
"I have had surgeries that led to a few different infections in my bowel which has led to severe 10 out of 10 pain when passing bowel motion.  The theory is scar tissue has caused this condition, but after all the tests there is no way to verify, because it is in the small intestine.  Years of pain, three trips to ER with horrific pain, and a decade later a doctor put me on this.  This medicine has been a miracle, never had any pain since, I went from suicidal to being able to function and even go on vacation.

However, there has been side effects.  I have had blurred vision, I am generally lethargic at all times, and nausea.  All said and done, the side effects are nothing compared to the other pain, but they are bad at times."