My airline supplies Malarone as part of the package when we stay in Africa (Sierra Leone, Ghana, E Guinea). Seems to provide good protection and minimal side-effects..(delhi-belly at times) I also pack a can of insectiside for my room, and finally deet 50%....as well as following the advice to cover-up etc. Been visiting for 7 months..through the rainy season, I havent been bitten...touch wood!