Ma huang is a sympathomimetic agent. The active principles are ¡-phenethylamines (Fig. 29.11).11-13 These agents can stimulate the release of epinephrine and norepinephrine from nerve endings. Ma huang is a sympathomimetic stimulant in the periphery as well as in the central nervous system (CNS). It has positive inotropic and positive chronotropic effects on
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