Plants from this genus produce toxic alkaloids and cardiac glycosides g-strophanthin (syn.

Fraenkel also first used g-Strophanthin (ouabain) in heart failure, a practice which continues to be advocated by some practitioners in Germany.

Strophanthus gratus (tropical west Africa; poison: ouabain, g-strophanthin)

Strophanthin is the name given to two different compounds, g-strophanthin (ouabain) obtained from Strophanthus gratus and k-strophanthin from Stroph.

Ouabain (g-strophanthin) is found in the ripe seeds of African plants Strophanthus gratus and the bark of Acokanthera ouabaio.