Check with your doctor or a travel clinic. I went to a travel clinic first and they tried to get me to take a lot of stuff I wasn't sure I needed so I got an rx for something for malaria and some Cipro for anything immodium won't clear up. Before agreeing to anything else I went back to my regular doctor and it turned out I'd already gotten my Diptheria and Tetnus from him (2 of the things the travel clinic pushed). I also got him to prescribe Twinrix for Hep A and B (fyi, this one was very expensive and wasn't covered by health insurance, here in Canada anyway).