Yunnan Bai Yao-induced platelet release in suspensions of washed platelets.

The effects of Yunnan Bai Yao on platelets was investigated in the absence of plasma co-factors. Platelets were washed with Tyrode's solution and incubated with this herbal drug at 37 degrees C. It was found that this drug can, to a lesser extent, also induce the release of platelet constituents in the absence of the plasma co-factors. The possible action of this drug is also discussed.