They are able to increase urinary secretion by renal and extra-renal mechanisms.
Plants that possess this action are numerous and often contain, alone or variously associated, potassium salts, sugars, saponins, flavonoids, xanthine bases (caffeine), and cardiotonic glucosides.

Betulla, Solidago, Pilosella, Ginepro, Ginestra, Ononide, Erica, Caffè, Parietaria, Gramigna, Frassino, Scilla