Age-related effect of ritanserin on the sleep-waking phases in rats

Roumen Kirov, Slavianka Moyanova

Research output: Contribution to journalArticlepeer-review


The age-related effect of the specific 5-hydroxytryptamine-2A/2C (5-HT(2A/2C)) antagonist ritanserin at two doses (0.63 mg/kg and 2.5 mg/kg) on six sleep-waking phases in young, middle-aged, and old male Wistar rats was electroencephalographically (EEG) examined. Only in the young and middleaged rats, ritanserin enhanced slow wave sleep and reduced wakefulness in a dose-dependent manner. Ritanserin suppressed paradoxical sleep, such that this effect did not depend on the age. Although the effect of ritanserin on slow wave sleep was significantly smaller in the old compared to the young and the middle-aged rats, ritanserin produced an apparent sleep-improving effect in the old age group.

Original languageEnglish
Pages (from-to)265-278
Number of pages14
JournalInternational Journal of Neuroscience
Issue number3-4
Publication statusPublished - Apr 1998


  • 5-HT receptors
  • Aging
  • EEG, rats
  • Ritanserin
  • Sleep-waking phases

ASJC Scopus subject areas

  • Neuroscience(all)


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