Two studies of the effects of dronabinol on the intestinal dysfunction in healthy volunteers were conducted by Esfandyari et al. in the U.S. Both observed that THC significantly slowed gastric emptying, especially in females, and was associated with colon relaxation. The results could help explain marijuana's anti-emetic effect, and lead to better treatment of irritable bowel syndrome.
http://cannabisculture.com/v2/...oid-Studies-Released