I will yet again offer my thoughts on this issue. The parasite that causes the disease being transmitted by a particular genus of mosquito, it follows that ensuring you minimise risk of getting bitten is a very effective defense. The tablets (and even the medics will admit this if you ask them) are no guarantee against malaria, merely a reducer of risk - they are also the equivalent of dunking the body in a vat of chemicals. The WHO and other such bodies are working for a truly effective block to the disease, but meanwhile they have never suggested issuing the population of affected areas of the globe with these tablets nor do they even suggest those people should consider using them. The mosquitos are most active during weak light (dawn and dusk and dim artificial light, less in total darkness) and they have very predictable locations for lurking in. They are extremely susceptible to insecticides. Therefore, spray (Baygon original is the most effective but others work well also) your bedroom at least at three day intervals short bursts each: into all ceiling/wall corners, under all furniture, onto any curtains and around windows and doors - and keep windows and doors shut. Wear repellent (mosquito milk, tropical is very good) on all exposed skin including forhead, behind ears, under chin, down the neck, arms (two sides) legs, ankles and feet. A mosquito net (insecticide impregnated is best) over the bed is an added protection if available. I have spent probably over a decade total in malarial areas, gave up on the tablets after a few weeks and employing these measures neither I nor the three family members accompanying me some of the time have ever had malaria. In case of the unlucky event, if you suffer cold/flu-like symptoms within six weeks of returning hom then insist on a malaria test to eliminate that possibility.