title: Antimanic drugs stabilize hamster circadian rhythms.
abstract: The circadian wheel-running rhythm of golden hamsters was monitored during chronic oral treatment with four mood-stabilizing drugs in doses relevant for treatment of manic-depressive disorder. Carbamazepine and verapamil shortened the duration of locomotor activity and improved the stability of the pattern of running activity. At comparable doses, valproate had no clear effect on any rhythm variable tested. None of these drugs consistently altered the phase of light-synchronized running rhythms or the period of the rhythm in constant darkness. The results are compared to data showing that lithium, which delays entrained phase and lengthens circadian period in hamsters, also shortens activity duration and increases the stability of wheel-running rhythms. Stabilization of circadian rhythms may be a key action of clinically effective mood-stabilizing drugs.
authors.affiliation: Veterans Affairs Medical Center, Research Service 151, San Diego, CA 92161, USA.
authors.forename: H
authors.initials: H
authors.lastname: Klemfuss
authors.forename: D F
authors.initials: DF
authors.lastname: Kripke
mesh_terms: D000818:Animals; D001143:Arousal / Q000187:drug effects*; D002220:Carbamazepine / Q000494:pharmacology*; D002940:Circadian Rhythm / Q000187:drug effects*; D006224:Cricetinae; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D016651:Lithium Carbonate / Q000494:pharmacology*; D008297:Male; D008647:Mesocricetus; D009043:Motor Activity / Q000187:drug effects*; D011619:Psychotropic Drugs / Q000494:pharmacology*; D014635:Valproic Acid / Q000494:pharmacology*; D014700:Verapamil / Q000494:pharmacology*
chemical_list: D011619:Psychotropic Drugs; D016651:Lithium Carbonate; D002220:Carbamazepine; D014635:Valproic Acid; D014700:Verapamil