Before traveling, you need to check if any of the countries you are visiting have mosquitoes that carry malaria, malaria is a serious tropical disease which they spread. Many countries in Asia, Africa and South America have malaria, so its important you take anti-malarial medicine with you.
There are many medicines available for Malaria prevention, but for each of my trips I have taken Doxycycline 100mg. These have few side effects, are reliable, and are cheap to buy online.They are easy to take, 2-3 days before entering the Malaria zone, take 1 tablet with food per day. Continue taking 1 tablet with food per day whilst in the Malaria zone and for 4 weeks after leaving the Malaria zone.Another popular malaria medicine is Chloroquine, but this has more side effects than Doxycycline and some mosquitoes are resistant. The advantage to Chloroquine is that you only need to take it once a week, starting 2 weeks before entering the malaria zone and for 8 weeks after leaving.As with any medicines, you need to consult a doctor first. Whilst in the Malaria zone it is important to cover your skin, use mosquito repellent with Deet and use a mosquito net whilst sleeping.