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Hypotension from hypovolemia except as an emergency measure to maintain coronary and cerebral perfusion until volume could be replaced.
Mesenteric or peripheral vascular thrombosis unless it is a lifesaving procedure.
During anesthesia with cyclopropane or halothane anesthesia.
Documentation of allergenic cross-reactivity for vasopressors is limited. However, because of similarities in chemical structure and/or pharmacologic actions, the possibility of cross-sensitivity can not be ruled out with certainty.
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