If you think the CDC is going to err on the side of 'bring everything with you', then you should be reassured, because they say you don't need anything except in the border areas. They actually recommend against taking it if it is not necessary.
The problem with waiting until you need it is that you need to start the medication one week in advance. There is a new medication that you can start only a few days before and take every day, but that is very expensive. First, you don't need it unless you are going to the border areas. If you are going to be living in the border areas, you should discuss which drug is appropriate with a doctor at a travel clinic, not just with your family doctor.
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