My advice: don't forget you already took one and take another one 5 minutes laters...on an empty stomach...and then have coffee.
I ended up in the Urgent Care with such bad heartburn and chest pressure that I thought I was actually having a heart attack. Maalox and Nexium to the rescue, and I'm feeling much better. It really freaked me out. And THEN I remembered that I accidentally took two vitamins this morning and that sometimes one causes heartburn.
I'm going to set an alarm from now on so I don't do this again!