Black catnip (Phyllanthus nanus) is a traditional medicinal herb. Black catnip contains alkaloids, flavonoids, hydrolysable tannins, lignans, polyphenols, triterpenes, sterols and volatile oil. The leaves contain varying amounts of toxic compounds which should not be fed to poultry.
Methanolic extracts of roots and fruits showed significant concentration-dependent antibacterial activity in vitro against a range of gram-positive and gram-negative bacteria.
A chloroform fraction of the aerial parts showed a significant inhibitory effect against the dermatophytic fungus Microsporum gypseum and against the yeast Candida albicans.
In DHBV-infected ducklings, nirtetralin B significantly reduced the serum DHBV DNA, HBsAg, HBeAg, ALT and AST. And analysis of the liver pathological changes confirmed the hepatoprotective effect of nirtetralin B.