I had to take prescription antibiotics+dieuretics for two months after an evening got too exciting. Taking them without food had some pretty nasty effects on my stomach, but I had to take the pills more often than I usually eat.
Also, those stomach problems didn't really stop afterwards either. Luckily, my symptoms were relatively mild compared to everyone else in this thread.
For the mild stuff, yogurt also works really well. It can't be the shitty yoplait, it has to be actual yogurt. I buy the little cup versions and have one most every breakfast, and the symptoms usually don't follow me even when I skip them now either.
I've found that I can drink one coffee, consequence free, so long as I have a yogurt to go with it.