I think that the reports of bad side effects from anti-malarials are mostly related to the drug Mefloquine (Lariam). Lots of reports of insomnia, hallucinations, nightmares. You don't hear much with Chlorquine. I just looked at the CDC website. It lists of all Belize, with the exception of Belize City, as being at risk. That said, we usually don't bother with the meds.