we go every year and dont bother, just take mosquito repellant with you and a room spray, or you can buy the coils to light in the room once there.
If you take the malaria pills, no doubt they will give you the runs,our pal came with us last hear and took them and was really bad, we suggested he stopped taking them and within 24 hrs he was fine for the rest of the holiday.
You can buy most tablets/ medication over the counter there without a prescription, even viagra !