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sympathomimetic drug

any of various drugs that interfere with the functioning of the sympathetic nervous system by affecting the release or action of norepinephrine and epinephrine. The former are hormones, secreted by the adrenal gland, that constrict blood vessels (thus increasing blood pressure) and accelerate the rate and force of contractions of the heart.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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