Ouabain is a toxic compound derived from the seeds of the Strophanthus plant, traditionally used in African medicine. It acts as a cardiac glycoside, which means it can influence heart function by increasing the force of heart contractions and regulating heart rate. In modern medicine, ouabain has been studied for its potential therapeutic effects in treating heart failure and hypertension. However, due to its toxicity, it is not commonly used as a medication. Researchers continue to explore its mechanisms and possible applications in cardiovascular health.