Periwinkle Plant (IMAGE) Georgia State University Caption Vinpocetine, an existing anti-stroke drug and alkaloid extracted from the periwinkle plant, was found to be an effective treatment for middle-ear infections. Credit © wi1diris/iStock Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.