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Case Reports
. 1997 Apr;90(4):451-3.
doi: 10.1097/00007611-199704000-00020.

Problems in assessment of acute melatonin overdose

B J Holliman  1 , P A Chyka
Affiliations
Case Reports

Problems in assessment of acute melatonin overdose

B J Holliman et al. South Med J. 1997 Apr.

Abstract

Melatonin is sold in the United States as a dietary supplement and is promoted primarily as an aid for insomnia, stress, jet lag, and aging. Cases of acute poisoning have not been reported, partially because of problems in assessment of toxicity. We report the case of a 66-year-old man who became lethargic and disoriented after taking 24 mg melatonin to aid relaxation and sleep the evening before prostate surgery. He recovered uneventfully, and after the scheduled surgery he resumed his regular practice of taking 6 mg melatonin with prescription sedative drugs. Although melatonin is not regulated as a drug, it may interact with benzodiazepines, be antagonized by naloxone and flumazenil, and interact with melatonin receptors in the central nervous system and elsewhere in the body. Melatonin appears to be pharmacologically active and should not be considered a benign agent on overdose.

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