Well I guess I have 2 questions. First of all, I have been on levsinex for a while, but I can only have a half of the dose for about 2 days before I get very dizzy and get bad headaches. I was recently started on LevBid, and today I've had a headache- could be allergies though. I also took Bentyl which for some reason made me nauseous. I was wondering if anyone has experienced this with their medicines and what medicines don't have those effects. My second question is- since antispasmodics, such as levsin, bentyl, etc. slow the digestive track down, does this result in weight gain? Well, thanks, and I hope to hear from you! ~Lisa~