Quinine sulfate is used to treat malaria. This medication kills the organisms that are responsible for malaria in order to cure afflicted individuals. It is taken orally three times a day for several weeks in order to stop malaria from returning after symptoms abate.
This medication should only be used to treat malaria. It should not be taken as a preventive measure against malaria or for any other purpose. It is especially important not to use it to treat nighttime leg cramps. This medication is not effective against cramps. In addition, using it for this purpose can cause kidney disease and irregular heartbeats.