What are the contents of vino de quina that allow it to induce an abortion?

Quinine: abortion?: "Vino do quina" probably refers to the use of quinine in an attempt to induce abortion. This method is rarely "successful", and when it "is", it is probably an event that would have occurred spontaneously. There are more definitive ways with medication to induce termination of pregnancy early in gestation safely for the mother.