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4
SR-71A_Blackbird 4 points ago +5 / -1

Quinine is available over the counter. It is an ingredient in tonic water.

6
rma92 6 points ago +7 / -1

Yes but not in enough quantity to be medically useful.

It can be useful for solving certain types of cramps - getting a dose would require consumption of a couple of liters of tonic water.