Doxycycline is a prescription medication that can be used to prevent malaria, a potentially fatal disease transmitted by mosquitoes. Malaria is caused by microscopic parasites that enter your blood when you are bitten by an infected mosquito. A preventative course of the antibiotic Doxycycline kills any malarial parasites that enter your body. If you are travelling to Sub-Saharan Africa or malarial regions of Asia or South America, you should consider beginning protective treatment before your trip.
