s be clear about form of promethazine as it comes in a liquid mainly for cough medicine promethazine w/codeine (promethazine w/codeine syrup is highly abused in our country) plain promethazine syrp, promethazine vc syrp and pill form.
Zofran comes in a liquid as well, dissolvable tablets (AKA
odt), and regular tablets. I would ask my doc for zofran, my friend took it for her full 9 months, she had morning sickness her entire pregnancy 24/7.