Anti Malaria Medication - Lariam (Mefloquine)
My wife went in to get the same tablets and her doctor recommended against Lariam, and after some research it's probably the worst of the anti-malaria meds for side effects, and considering Vanuatu doesn't have any malaria resistant strains, there are 3-4 other tablets we could have taken that would have done the job but been a lot safer.
There are cases I found it had been linked to suicide and mental disturbances lasting months until the drugs were out of your system.
Lariam is used by millions each year and most are safe, but if you have had any mental problems previous, or are prone to any of the many symptoms listed as side-effects I recommend talking to your doctor about other medications that are safer.