Datura metel leaves are used by athletes to enhance their performances. The water extract of the leaves and seeds was tested for their cardiotonic effect. Langherdoffs model for the measurement of the mechanical activity of isolated amphibian heart in ventricular perfusion was used to evaluate some parameters of cardiac contractility. The effect of the extracts was also compared to sympathetic agonist and antagonist. The leaves and seed extracts induced significant (p
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