When there is a tear or cut in the rectum there is a muscle called the sphincter muscle. Had I known this I would have been spared so much pain. Cyclobenzaprine is a muscle relaxer and it works to relax that muscle. I’ve never used Botox but my doctor put me out…an absolute must and he administered steroid shots right into that muscle. But without that fissure being sewn up it takes a long time for it to heal. God bless. Diane.