doxycycline 100 mg once daily (started one day before travel, and continued for four weeks after returning); mefloquine 250 mg once weekly (started two-and-a-half weeks before travel, and continued for four weeks after returning); atovaquone/proguanil (Malarone) 1 tablet daily (started one day before travel, and continued for 1 week after returning). Can also be used for therapy in some cases.