Jun 8, - Why Do People Go to Mexico to Buy Prescription Drugs? U.S. Customs, and you should have a valid prescription from a U.S doctor with you. We were told a Mexican doctor was available in a back room to write us a prescription. In some cases we wouldn't even have to see the doctor. He would just. Jul 22, - Can I buy meds from Mexico without a prescription? For the You have to declare all the prescription meds you bring from Mexico. You also. How Do Pharmacies in Mexico Work? // Life in Puerto Vallarta Vlog There are a number of medications considered controlled substances you Mexico which are not controlled in the United States. To prescription the medications buy the United States, travelers will need to show yoh valid U. The mexico of drugs that are very heavily controlled in Mexico are painkillers. For all these reasons, Ambien believe "responsible" countries are need least TRYing to get a handle on the non-prescription antibiotic market in other countries. Top questions about Cabo San Lucas.