Let´s start by saying that it is illegal to fill a prescription in México without a prescription from a Mexican doctor. So if you have a medical condition, make sure to bring enough medication for your entire trip or any information that would help a local doctor prescribe what you need.
You will find some pharmacies that sell prescription drugs over the counter (without a prescription), but authorities are starting to get really tough on them. In many situations the pharmacist will actually keep the prescription so you cannot re-buy it elsewhere.
It is also important to know that it is illegal to bring large quantities of drugs for resale into the United States. The FDA believes that many pharmaceutical manufacturers based in other countries are not FDA approved according to US standards so they will not allow them in to the country.
The good news is that It is still possible to purchase medications (both over-the-counter and prescription) for your own personal use, from a Mexican pharmacy for a fraction of the cost in the United States—(this can be very attractive for people who have to take drugs regularly and are under economic stress)
When you come back to the US, border officials will use discretion when it comes to prescription medication, so if you find yourself in the situation where you must take prescribed Mexican drugs in to the US, just bring an amount that will help your situation until you are able to get your prescription filled in a local US pharmacy and you will be fine. But be prepared for trouble if you’re trying to bring with you a large quantity of meds or narcotic drugs for recreational use.
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