Medications that are not approved by the FDA may not be allowed. However, if you have medications that are considered a controlled substance including some cough medicines, tranquilizers, sleeping pills, antidepressants, or stimulants, you may only bring up to 50 dosage units across the border without a prescription. I reccomend them to anyone visiting Cozumel. You will also need to provide the name and address of the U. I followed this business from the former location to the current one on the waterfront. This is especially true with drugs that are available only by prescription in the United States but sold over the counter in Mexico.GENERIC VIAGRA (sildenafil) 50 mg w/10 tabs $40 50 mg w/20 tabs $70 GENERIC VIAGRA (sildenafil) mg w/10 tabs $70 w/20 tabs $ or $ for 30 tabs Allergan . Save. Oddly enough you don’t necessarily need a prescription to pick up your meds in Mexico. In Cozumel recently I noticed a number of places where you could purchase a . 5 years ago. Save. I will not say for certain, but for the most part the only things requiring a prescription are antibiotics. And even then, for a price you can often get them. I .