Abstract
A digitalis-type cardiotonic action of the aqueous extracts of the bark, flowers, leaves and fruit of Viburnum lantana, Viburnum opulus and V. opulus var. st er ili s has been demonstrated by the method of continuous infusion in isolated frog and dog heart.
The glycoside concentrates from the bark of these species have a cardiotonic action up to a dilution of 1:250000 and respond positively to all the reagents of the cardiotonic glycosides.
The activity of the extracts decreases in the following order: bark, leaves, fruit, flowers.
