The volunteers then indicated whether any of the first strings appeared in the second long string. The time the volunteers took to remember was then assessed. On a placebo the women took an average of 700 milliseconds to response when the first set contained 3 digits. Vinpocetine is a derivate of vincamine, which is an extract of the periwinkle. Although they have many similar effect vinpocetine has more benefits and fewer adverse effects than vincamine.
Adverse effect are rare, but include hypotension, dry mouth, weakness, and tachycardia.
Vinpocetine has no drug interactions, no toxicity, and is generally very safe. One or two 5 mg tablets per day.