Atractylon, a major component of the crude drug "Byaku-jutsu" (rhizomes of Atractylodes japonica), strongly inhibited Na+,K(+)-ATPase activity with an I50 value of 8.9 x 10(-6) M. It also inhibited Mg(2+)-ATPase, H+,K(+)-ATPase, H(+)-ATPase and Ca(2+)-ATPase activities, but less potently. No effects