Despite serious safety concerns, Madagascar periwinkle is used for diabetes, cancer, and sore throat. It is also used as a cough remedy, for easing lung congestion, and to reduce fluid retention by increasing urine production (as a diuretic).
Some people apply Madagascar periwinkle directly to the skin to stop bleeding; relieve insect bites, wasp stings, and eye irritation; and treat infections and swelling (inflammation).
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