Abstract
Melatonin, as the hormone of the circadian system, plays a major role in regulating physiological functions and facilitating adaptation to environmental changes. Here we provide brief overview of circadian physiology, as related to the use of melatonin as hormone replacement therapy for older individuals with reduced melatonin secretion and melatonin treatment for patients with chronic insomnia or circadian desynchronization. Emphasizing the importance of minimal effective doses, we discuss the use of both immediate and delayed-release formulations, stress the significance of regular administration timing, and advise against exposure to bright light during increase in melatonin levels. Our discussion underscores that the medical guidance is essential for utilizing melatonin-containing preparations in the therapy of chronic insomnia.
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