If you have nocturnal (nighttime) leg cramps, your doctor might prescribe quinine (Qualaquin)-even though the U.S. Food and Drug Administration has approved it for only one purpose: to treat ...

Get detailed information on Quinine, including pronunciation ... The recommended dose is 648 mg 8 hourly for 7 days. Nocturnal leg cramps- The recommended dose is 200-300 mg at bedtime.

But the FDA has issued repeated warnings against using quinine to prevent or treat leg cramps because it may cause serious side effects, including severe anemia, bleeding and kidney damage.