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drug interaction

(ĭn′tər-ăkshən)
n.
  1. The pharmacological result, either desirable or undesirable, of drugs interacting with themselves or with other drugs, with endogenous chemical agents, with components of the diet, or with chemicals used in or resulting from diagnostic tests.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.