The simple answer is 'No'. As far as I know, only Mail Boxes Etc. has a permit to import medicines and they will charge you heavily, making it hardly worth the effort and the problem of occasional confiscation anyway. You are much better off purchasing your medications in Mexico and submitting to your insurance for reimbursement. You may carry a reasonable amount of your own personal medications across the border, suitable for the length of your visit to Mexico. They should be in original containers and you should have the prescription or a letter from your MD.