After any surgery involving anesthesia and post-operative narcotics, patients are often constipated and at times nauseated. Most cosmetic patients have not had internal abdominal surgery, so dehydration and narcotics are usually the reasons.
I tend to advise taking it easy on the narcotics if possible. Adding Psyllium, a natural fiber laxative, with liberal water intake can relieve things without the need for anything more harsh. If you are under the care of another surgeon, you shouldn’t add anything without letting him or her know.
One of the reasons I am so fond of pain pumps for tummy tuck patients is to reduce their need for narcotics after surgery. This really diminishes constipation.