Purchasing prescription medication in Mexico without a ... - PMC

: Officially, Mexican health authorities ( COFEPRIS ) required a valid physician's prescription to dispense phentermine.

In 2016, phentermine—often sold under the Mexican brand name Terfamex —was technically classified as a restricted medication in Mexico, though enforcement of this requirement varied significantly. Legal and Practical Availability

: Buying from small, non-chain pharmacies in tourist zones carries a high risk of obtaining counterfeit medications that may contain dangerous substances like fentanyl. Important Considerations for U.S. Travelers

If you are planning to bring phentermine back to the U.S., keep these federal regulations in mind: