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Aust Fam Physician. 1998 Aug;27(8):714-5.

Alpha adrenergic blockers and adrenaline. A mysterious collapse.


In 1995 I encountered a problem with the use of adrenaline in the resuscitation of a patient on prazosin who had an anaphylactic collapse resulting from a bee sting. I concluded that the problem was the result of the 'reversed adrenaline effect' and I predicted that other drugs with alpha adrenergic receptor blocking activity such as the phenothiazines could similarly obstruct the action of adrenaline. A literature review of the reversed adrenaline effect revealed a number of animals studies but no articles relating to humans. I present this case study as another example of drugs with alpha adrenergic receptor blocking activity (thioridazine and amitriptyline) obstructing the action of adrenaline in anaphylactic collapse.

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