Melatonin Dosing Recommendations

Introduction to Melatonin Use

The American Academy of Sleep Medicine recommends against using melatonin for chronic insomnia in adults, but when used for circadian rhythm disorders, doses of 3-5 mg taken between 19:00-21:00 are most effective 1, 2

The American Academy of Sleep Medicine explicitly suggests clinicians NOT use melatonin for sleep onset or sleep maintenance insomnia in adults, due to minimal efficacy and poor quality improvement, with a very low quality of evidence 1, 3, 4, 5
Melatonin performs poorly compared to FDA-approved hypnotics for primary insomnia, with only a 9-minute reduction in sleep latency compared to placebo (95% CI: 2-15 minutes) 1, 5

For Delayed Sleep-Wake Phase Disorder (DSWPD) in adults, start with 3-5 mg of immediate-release melatonin taken between 19:00-21:00 for at least 28 days 2
For DSWPD in children without comorbidities, use weight-based dosing of 0.15 mg/kg taken 1.5-2.0 hours before habitual bedtime for at least 6 nights 2
For DSWPD in children with psychiatric comorbidities, give 3 mg (<40 kg) or 5 mg (>40 kg) at 18:00-19:00 for 4 weeks 2
For Non-24-Hour Sleep-Wake Rhythm Disorder (N24SWD) in blind adults, use 0.5-10 mg melatonin taken either 1 hour before preferred bedtime or at a fixed time (21:00) for 26-81 days, with an odds ratio for entrainment of 21.18 (95% CI: 3.22-39.17) 6

Prolonged-release melatonin 2 mg may provide modest benefit for elderly patients, though evidence quality is low 2
The American Academy of Sleep Medicine's recommendation against melatonin for insomnia applies to all adults, including elderly 1, 2

The optimal therapeutic range for most circadian disorders is 3-5 mg of melatonin 2
Doses above 10 mg risk receptor desensitization with no additional benefit 2
The maximum dose is 12-15 mg, used only for specific conditions like REM sleep behavior disorder 2

No serious adverse reactions have been documented across age groups, but common mild side effects include morning headache, morning sleepiness, and gastrointestinal upset 2, 6
Specific contraindications/cautions include warfarin users, epilepsy, and wrong timing, which can worsen circadian misalignment 1, 2

For primary insomnia, do not use melatonin; consider FDA-approved hypnotics (zolpidem 10 mg, eszopiclone 2-3 mg, or others) 1, 3
For DSWPD in adults, start 3-5 mg immediate-release at 19:00-21:00 × 28 days 2
For DSWPD in children without comorbidities, calculate 0.15 mg/kg, give 1.5-2 hours before bedtime × 6+ nights 2
For DSWPD in children with psychiatric comorbidities, give 3 mg (<40 kg) or 5 mg (>40 kg) at 18:00-19:00 × 4 weeks 2
For N24SWD in blind adults, start 5 mg at 21:00 or 1 hour before preferred bedtime × 26+ days 6