Cited by 94Circadian rhythm and melatoninSleep and related disordersSleep and Wakefulness Research

Loss of response to melatonin treatment is associated with slow melatonin metabolism

Braam, W., Van Geijlswijk, I., Keijzer, Henry, Smits, Marcel G., Didden, Robert, Curfs, Leopold M. G.·2010·Journal of Intellectual Disability Research

Abstract

BACKGROUND: In some of our patients with intellectual disability (ID) and sleep problems, the initial good response to melatonin disappeared within a few weeks after starting treatment, while the good response returned only after considerable dose reduction. The cause for this loss of response to melatonin is yet unknown. We hypothesise that this loss of response is associated with slow melatonin metabolism. METHOD: In this study, we determined melatonin clearance in two female (aged 61 and 6 years) and one male (aged 3 years) patients who had chronic insomnia, late melatonin onset and mild ID, and whose sleep quality worsened a few weeks after initial good response to melatonin treatment, suggesting melatonin tolerance. After a 3-week washout period, patients received melatonin 1.0, 0.5 or 0.1 mg, respectively. Salivary melatonin level was measured just before melatonin administration, and 2 and 4 h thereafter. After this melatonin clearance test, melatonin treatment was resumed with a considerably lower dose. RESULTS: In all patients melatonin concentrations remained >50 pg/mL at 2 and 4 h after melatonin administration. After resuming melatonin treatment sleep problems disappeared. The same procedure was followed in three patients who did not show loss of response to melatonin after 6 months of treatment. In all patients in the control group melatonin concentrations decreased between 2 and 4 h after melatonin administration with a mean of 83%. CONCLUSION: We hypothesise that loss of response to melatonin treatment can be caused by slow metabolisation of exogenous melatonin. As melatonin is metabolised in the liver almost exclusively by cytochrome P450 enzyme CYP1A2, this slow melatonin metabolism is probably due to decreased activity/inducibility of CYP1A2. In patients with loss of response to melatonin, a melatonin clearance test should be considered and a considerably dose reduction is advised.

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Crossref · 10.1111/j.1365-2788.2010.01283.x

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Authors
Braam, W., Van Geijlswijk, I., Keijzer, H., Smits, M. G., Didden, R., & Curfs, L. M. G.
Affiliations
  • Maastricht University (NL)
  • Ziekenhuis Gelderse Vallei (NL)
  • Radboud University Nijmegen (NL)
  • Maastricht University Medical Centre (NL)
Corresponding author
Braam, W.
Venue
Journal of Intellectual Disability Research
Publisher
Wiley
Published
2010-05-20
Volume
54
Issue
6
Pages
547-555
ISSN
  • 0964-2633 (ISSN-L)
  • 1365-2788
OpenAlex
W2157939113
Cited by
94
References
32
Citations by year
2026: 4 · 2025: 9 · 2024: 1 · 2023: 3 · 2022: 8 · 2021: 8 · 2020: 7 · 2019: 2 · 2018: 6 · 2017: 11 · 2016: 4 · 2015: 7 · 2014: 8 · 2013: 5 · 2012: 5
FWCI
2.31
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Intellectual Disability Research (publishedVersion)
  • PubMed (publishedVersion)
  • Research Publications (Maastricht University) (publishedVersion)
  • Radboud Repository (Radboud University) (submittedVersion)
  • Research Publications (Maastricht University) (submittedVersion)
Funders
's Heeren Loo
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
Keywords
melatonin, melatonin metabolism, chronic insomnia, intellectual disability, sleep disorders, CYP1A2, cytochrome P450, dose reduction, salivary melatonin
MeSH terms
Child, Child, Preschool, Drug Tolerance, Female, Humans, Sleep Initiation and Maintenance Disorders, Male, Melatonin, Intellectual Disability, Metabolic Clearance Rate, Middle Aged, Saliva

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