A 25-year-old Caucasian man developed Plasmodium falciparum malaria after traveling to Gambia, despite having received chemoprophylaxis with mefloquine. The patient was hospitalized after returning to the United States. He received a 3-day course of atovaquone-proguanil and made a complete recovery. This case illustrates the potential role of pharmacists in the pharmaceutical care of travelers and underscores the importance of using current recommendations for preventing and treating malaria.