One Lousy Antacid

I'm laying here and my legs are going crazy but thankfully not my body. I figured it was something I ate or the amount or timing...rather late evening. I thought I'll just wait it out eventually the food will digest. Then I remembered I took a Zantac antacid before my Mexican dinner. I'm not waiting 12 hours for it to wear off. I'm taking an iron pill and going to sleep. One lousy pill that's all it takes. What if I didn't know and took it every day as my GI doc would like me to do?