Malarone is a combination of two drugs, atovaquone plus proguanil, in one tablet. It is available under the brand name, Malarone.
Prescription: The adult dosage is 1 adult tablet (250 atovaquone/100 mg proguanil) once a day. Take the first dose of atovaquone/proguanil 1 to 2 days before travel to the malaria-risk area. Take your dose once a day during travel in the malaria-risk area. Take your dose once a day for 7 days after leaving the malaria-risk area. Take your dose at the same time each day and take the pill with food or milk.
Side Effects and Warnings:
The most common side effects reported by travelers taking atovaquone/proguanil are stomach pain, nausea, vomiting, and headache. Most people taking this drug do not have side effects serious enough to stop taking it.
See http://www.cdc.gov/travel/malariadrugs.htm