that anti-nausea drugs are actually antihistamines? I've been working in a pharmacy for about a week and I learned that. Antihistamines are anti-nausea as a side effect, and also make you sleepy. I always wondered why my Phenergan gave me such awful dry-mouth...now I know! That's also why some cough syrups have anti-nauseas in them...because they will help if you have a stuffy nose too.