All medications must be declared upon arrival at the border. In addition, some prescription medications in the U. Even as U. Customs officials will generally want a letter from the individual patient stating that the drug from a Mexican pharmacy is intended for personal use to treat a serious medical condition. Essentially, you are agreeing that you are not going to be selling the drugs or giving them to someone else. One of her children had a high fever, keeping Salcido from being able to go to work.Is It Safe to Buy Prescription Drugs From a Mexican Pharmacy? Legality and Limits of Bringing Medications Into the U.S. By Marian Anne Eure. Updated on July 17, . June 14, 12 PM PT. Tijuana — As coronavirus restrictions make it more difficult to cross the border, some San Diego-area residents say they are struggling to get the . travellerCA. Anaheim, California. Destination Expert. for Tijuana, Anaheim. Level Contributor. 9, posts. 12 reviews. 70 helpful votes. 1. Re: Viagra in TJ.