For about the last 5 years, pepto tablets have been my anti-emetic of choice. I feel like they are becoming less effective. I used to be able to take 2 and feel better within 20 minutes. After a few years it seemed like I had to take 3 to get the effect that 2 used to have. Now oftentimes 3 doesn't work. Sometimes my ginger pills seem to be losing their potency too. I'm trying to stay away from pepto and hopefully it'll become more effective again.

Are there any stronger anti-nausea medicines I can get without prescription? Have you guys built any immunity to you medicines?