Hmm... from a FAQ about the Dominican Republic

http://www.hispaniola.com/dominican_republic/info/faq.php

What is the policy on drugs?
The Dominican Republic can be quite lax on many things compared to North America or Europe, but drugs are certainly not one of them. If you want to avoid spending time in extremely nasty Dominican jails, with very little hope for bail, it is strongly advised that you do not bring in, buy, sell, or consume illicit drugs in the Dominican Republic. Over the counter and prescription drugs should be in containers that are clearly labeled to avoid any possible problems.

Also from a Salon article last August

http://dir.salon.com/story/news/feature/2005/08/12/cafta_drugs/index_np.html

Costa Rica's free, universal system depends on cheap drugs to keep costs down. Roman Macaya, executive director of the National Chamber of Generic Products of Costa Rica, says that if CAFTA-like protections had been in place, buying drugs would have put the system in financial jeopardy. Along with the Dominican Republic and Nicaragua, Costa Rica has yet to sign on to CAFTA and drug-pricing promises to be a big issue in the country's upcoming presidential election. "Costa Rica will most likely have to adopt a policy where older drugs are prescribed rather than the latest drugs even if HIV strains have evolved to be resistant to those older drugs," Macaya says. "Most of the drug prices for the new drugs are going to be out of reach under CAFTA."