Can Phenergan and Tamiflu be taken together to relieve nausea?
there are no known interactions between promethazine (phenergan) and oseltamivir (tamiflu) so taking them together is not supposed to cause any harm. Tamiflu may sometimes cause nausea. If it's serious (and ends up with vomiting) then you can take phenergan or metoclopramide (but not both!).
I hope it helps!