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Effect of Sodium Valproate on Nocturnal Melatonin Sensitivity to Light in Healthy Volunteers

Hallam, Karen, Olver, James S and Norman, Trevor R (2005) Effect of Sodium Valproate on Nocturnal Melatonin Sensitivity to Light in Healthy Volunteers. Neuropsychopharmacology, 30. pp. 1400-1404. ISSN 0893-133X

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Sensitivity of the pineal hormone melatonin to bright light at night has been proposed as a putative marker of bipolar affective disorder. Patients with bipolar disorder have a super-sensitive melatonin response to light. No studies have investigated whether super-sensitivity is due to agents used to treat the illness or is associated with the disorder per se. We investigated the effect of valproate on this phenomenon. Melatonin sensitivity to light was determined on two nights in 12 healthy volunteers (5M, 7F). Between testing nights participants received 200 mg of valproate b.d. for 5 days. Valproate significantly decreased the sensitivity of melatonin to light. On the other hand, valproate had no effect on overall melatonin secretion or dim light melatonin onset. The ability of valproate to decrease the sensitivity of melatonin to light may relate to its therapeutic effect in bipolar disorder—an ability to lengthen circadian period similar to that of lithium.

Item Type: Article
Uncontrolled Keywords: ResPubID16571; melatonin, valproate, light sensitivity, bipolar disorder, chronobiology, nocturnal
Subjects: Historical > Faculty/School/Research Centre/Department > School of Social Sciences and Psychology
Current > FOR Classification > 1109 Neurosciences
Depositing User: VUIR
Date Deposited: 20 Mar 2012 04:09
Last Modified: 20 Mar 2012 04:09
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Citations in Scopus: 57 - View on Scopus

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