Larium, is effective just about anywhere, but may have nasty side effects in some individuals. I find that up to three months its OK, after that it makes me tired, I had one hallucination, woke up in the night, albeit after a glass of wine, but it made me realise the effect.
I work with an expert on malaria, his advice is to acquire a treatment stock of ACT (Coartem) and forget about the prophylactics. use a bed net, DEET, long sleves etc. get yourself a slide kit to take blood samples and know how to use it i.e. take samples before taking treatment.
Educate yourself on the symptoms and the neccesary action. Delay can kill.
Doctors differ, patients die.