Melatonin Dosing for Adults

Context-Specific Dosing Recommendations

• The American Academy of Sleep Medicine does not recommend melatonin for the treatment of chronic insomnia in adults, as trials using 2 mg doses showed no clinically significant benefit for sleep onset or maintenance 1, 2
• The American Academy of Sleep Medicine explicitly advises against using melatonin for chronic insomnia based on very low quality evidence from trials using 2 mg doses in older adults (>55 years) 1, 2
• Meta-analysis showed no clinically significant improvements in sleep latency, total sleep time, wake after sleep onset, or sleep quality at this dose 2, 3
• The benefits were judged approximately equal to harms, making it an ineffective choice for this indication 2
• For adults with DSWPD, use 5 mg of melatonin timed between 19:00-21:00 (7-9 PM) for at least 28 days, representing a weak recommendation based on low-quality evidence 4, 5
• This represents a weak recommendation based on low-quality evidence, but showed positive results in reducing sleep latency by approximately 38-44 minutes and increasing total sleep time by 41-56 minutes 5
• The timing is critical: administer 1.5-2 hours before desired sleep onset, not at bedtime 4, 5
• This recommendation applies to adults both with and without comorbid depression 4, 5

Practical Algorithm

• For DSWPD or circadian rhythm disorder, proceed with melatonin 5 mg 4, 5
• Administer 5 mg between 19:00-21:00 (or 1.5-2 hours before desired sleep time) and continue for minimum 28 days to assess efficacy 4, 5
• Chronic insomnia should not be treated with melatonin; consider FDA-approved hypnotics or CBT-I instead 1, 6