nausea/vomiting
"I've been on promethazine for about 2 years and it is the only medicine I've ever taken that actually works for nausea. I also take tramadol which has a bad interaction with promethazine so I only take it at night as it also makes you sleepy which could be a bad thing if you needed to take one early, but 1 25mg tab shouldn't make you too drowsy."