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ciprofloxacin (antibiotic which requires doctor's prescription).
In the future, before you go on your trip, it might be helpful to speak to your primary care physician about what to do if you get traveler's diarrhea. He/she will probably advise you to add the following 3 items to your first aid kit:
Stay well hydrated and, if you start feeling really horrible, don't hesitate to visit a nearby clinic.\
- probiotic Culturelle (dosing unknown, possibly preventative),
- ciprofloxacin (antibiotic which requires doctor's prescription), and
- Imodium/loperamide (over-the-counter antimotility agent).
Cipro requires a prescription in Mexico.