When I was ready to be banded my Dr have me a script for anti nausea meds. He told me they would be my best friend for the rest of my life. He said anytime I felt nauseous at all to take one. I haven't had surgery yet as I switched to the sleeve and am scheduled for surgery on June 25th. All I know is my Dr told me I was able to take the anti nausea pills any time from the second I woke up. So I don't see it being an issue at all but it's always good to call your dr