The present article describes the standardisation of two medicinal substances (radix Asari and extractum rhizomae Asari siccum), and the analysis of the effective substances of Asarum europaeum L. in three forms of application (tinctura rhizomae Asari recentis, dragees with dry extract, and tablets with the isolated effective substance: trans-isoasarone), which correspond to the-three phases of development of phytopharmaka. The results of the exami-' Kiinftiges Warenzeichen: ESCAROLm.