Hi Arin, I had to google Levsin and I have an antispasmotic, but rarely use it. Pentasa I have been on many times, and it helps reduce the inflammation and the Levsin will help stop cramping. They are totally different drugs. The Pentasa is something you will need to reduce your Crohn's symptoms. The antispasmotics may not work as some people dont think it works. The pentasa is a med you take all the time. Levsin you can take a few hours or as directed by your doctor, but they usually last about 4-6 hours.
Dont half the Penatasa it needs to get into the intestine. Just write down any side effects if you get them. I always eat with my meds, good practice. Good luck.