Multiple fractions from Phyllanthus urinaria exhibit anti-HCV activity.
Loliolide isolated from fraction 13 is an efficient inhibitor of HCV viral entry.
Loliolide inactivates HCV virion and blocks viral attachment and entry/fusion.
Loliolide merits further development as an entry inhibitor to HCV infection.
P. urinaria may be a potent source for the discovery of anti-HCV agents.