Bladder infections: That's more of a women's problem, but can happen to pretty much anyone. I know what antibiotics/meds help me, so I usually just take a pack or two with me on the road. When I didn't have it, I was lucky enough to be in a country where I didn't need a prescription. But it's important to mention that the first and second time it happened I was able to consult it with my doctor. I wouldn't recommend taking antibiotics without talking to a medical professional (actually, wouldn't recommend taking them at all, unless it's really, really bad).