I'm not a medical doctor, I do have a Piled Higher and Deeper in Biology and read way too much stuff.Levsin is another major antispasmodic in the US and the one I use, but it causes dry mouth, etc that all the other antispasmodics do.The problem is they are all varients of the same type of drug and sometimes people will tolerate one better than in a class, others may find anything in that class is bothersome for them.Your mileage may vary......If antispasmodics don't work the next place to look is to the antidepressants that are used in a wide variety of chronic pain conditions.The drugs can't tell a mood nerve from any of the other nerves that use serotonin as a neurotransmitter (and most of the serotonin in the whole body is in the GI tract, not the brain) so mucking with serotonin can relieve pain.Mind-body techniques can also be quite effective for managing pain.In some cases the pain may not be caused by actual spasms. It appears that some people who are in pain are having normal sensations that are NOT supposed to be reported to the brain ARE reported to the brain and the brain knows that if the gut says it feels something that something is pain because that is the ONLY thing it is supposed to say that it feels. (Kinda like accidently sending an email to everyone on your mailing list rather than just the person you were intending to send it to....too much information that wasn't ever supposed to be sent anyway)This may be why only some peoples pain responds to antispasmodics. There appear to be other mechanisms by which pain signals get generated.K.