In the United Kingdom and Australia, quinine is also regulated as a prescription-only medicine. While some reports suggest it may be more accessible in Canada, it is still generally dispensed by pharmacists upon receipt of a prescription. Available "Over-the-Counter" Variants

While you might find "quinine" mentioned in herbal supplements or homeopathic products at retailers like Walmart and Amazon , these are not medical-grade quinine tablets. Current Legal Status

Quinine sulfate is a prescription-only medication. The FDA issued a boxed warning against using it for nighttime leg cramps because the risks—such as fatal blood disorders and heart rhythm issues—outweigh the modest benefits for non-life-threatening conditions.