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There is limited experience of acute overdosage with flumazenil injection.

There is no specific antidote for overdose with flumazenil. Treatment of an overdose with flumazenil injection should consist of general supportive measures including monitoring of vital signs and observation of the clinical status of the patient.

Intravenous bolus administration of doses ranging from 2.5 to 100 mg (exceeding those recommended) of flumazenil, when administered to healthy normal volunteers in the absence of a benzodiazepine agonist, produced no serious adverse reactions, severe signs or symptoms, or clinically significant laboratory test abnormalities. In clinical studies, most adverse reactions to flumazenil were an extension of the pharmacologic effects of the drug in reversing benzodiazepine effects.

Reversal with an excessively high dose of flumazenil injection may produce anxiety, agitation, increased muscle tone, hyperesthesia and possibly convulsions. Convulsions have been treated with barbiturates, benzodiazepines and phenytoin, generally with prompt resolution of the seizures (see WARNINGS).


Flumazenil injection is contraindicated:

  • in patients with a known hypersensitivity to flumazenil or benzodiazepines.
  • in patients who have been given a benzodiazepine for control of a potentially life-threatening condition (e.g., control of intracranial pressure or status epilepticus).
  • in patients who are showing signs of serious cyclic antidepressant overdose (see WARNINGS).
This monograph has been modified to include the generic and brand name in many instances.

Last reviewed on RxList: 4/13/2016


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