The price difference is so great that some Americans travel to Mexico to take advantage of the savings. But there are limits. Medications that are not approved by the FDA may not be allowed. These drugs enlarge the blood vessels. Please note that the rules often change without notice, so it’s important to stay informed. Customs and Border Protection CBP will generally prohibit a supply for more than 90 days to come across the border.While there I looked at the prices for Cialis and Viagra. From my calculations one tab of Cialis ran something over $ Almost the same with Viagra. So, yes it is available . Answer 1 of Does anyone know where I could purchase Viagra or Cialis in Play del Carmen? I have a prescription in US but didn’t have time to fill order. Do I need a . Where is a safe place to buy cialis in cancun: Get Cancun travel advice on Tripadvisor’s Cancun travel forum.