Each tablet contains 260 mg quinine sulfate. Corn starch, pregelatinized starch, sodium starch glycolate, sucrose, and zinc stearate.
Quinine sulfate occurs as a white, crystalline powder, which darkens on exposure to light.
It is odorless and has a persistent, very bitter taste. It is slightly soluble in water, alcohol, chloroform, and ether. Its primary action is schizontocidal. No lethal effect is exerted on sporozoites or preerythrocitic tissue forms. Quinine sulfate is readily absorbed when given orally.