There are some good docs in Negril...Dr. Grant and some others. I'm sure your resort will hook you up if necessary. I would agree with being prepared. Check with your doc at home and let him know that you are going out of the country. I generally have many options ready....an antibiotic, lomotil (for diarrhea), stool softeners or ducolax supp. (for constipation), ASA, Tylenol, Aleve, Afrin nose spray, and a medrol pak...just in case. I definitely like to be prepared! One never knows when crap happens. Some cortisone cream is also a good idea or benadryl cream or capsules. Recent trip, bronchitis hit many guests. The Z-pac came in really handy.
Good luck and enjoy your trip!!