Quinine sulfate is a pharmaceutical substance used primarily as an antimalarial agent. Its chemical name is (R)-[(2S,4S,5R)-5-ethenyl-1-azabicyclo[2.2.2]oct-2-yl](6-methoxyquinolin-4-yl)methanol sulfate.
The CAS number for quinine sulfate is 6119-70-6.

Quinine sulfate works by interfering with the growth and reproduction of the malaria parasite, Plasmodium. It is often used in combination with other antimalarial drugs to enhance its effectiveness and prevent the development of resistance. Quinine sulfate can be administered orally or intravenously depending on the severity of the infection.

Aside from its antimalarial properties, quinine sulfate also exhibits muscle relaxant properties, which has led to its use in the treatment of muscle cramps and spasms. However, its use in this regard is limited, and other medications are generally preferred due to the potential side effects and toxicity associated with quinine sulfate.

Common side effects of quinine sulfate include nausea, headache, dizziness, and ri