Canada Approves Prescription Melatonin for Sleep Difficulties in Autistic Children, With Ongoing Safety Considerations

A Regulated Option for Sleep Support

Canadian families now have access to the first prescription melatonin treatment specifically approved for sleep difficulties in autistic children. Health Canada recently authorized SLENYTO®, an extended-release melatonin tablet, for children and adolescents with autism spectrum disorder (ASD) or Smith-Magenis syndrome (SMS), a genetic condition associated with disrupted melatonin production. Sleep difficulties are reported in 50-80% of autistic youth00211-1/abstract), often linked to sensory processing differences, anxiety, or other factors.

Melatonin, a hormone that helps regulate sleep-wake cycles, has been used off-label (without formal approval for this specific use) for years to support sleep in autistic children. A 2025 Lancet review00211-1/abstract) found that melatonin supplements can reduce the time it takes to fall asleep by 30-60 minutes for some autistic children, though effects vary widely. The prescription formulation offers standardized dosing compared to over-the-counter products, which may vary in quality.

Sleep difficulties are reported in 50-80% of autistic youth00211-1/abstract), often linked to sensory processing differences, anxiety, or other factors.

Balancing Benefits and Uncertainties

While melatonin use has grown significantly among young children, experts note important limitations. 'Melatonin can be a helpful tool for some families, but it works best as part of a broader approach that considers individual needs and sleep hygiene,' explains the Child Mind Institute. The 2025 Lancet review00211-1/abstract) found no evidence that melatonin improves daytime functioning or core autistic traits, underscoring its role as a sleep support rather than a treatment for autism itself.

Particular caution is advised for children under 5, as noted by the Science Media Centre, due to unknown effects on developing hormonal systems. The Simons Sleep Project, an open-science initiative, is gathering data to better understand sleep in neurodevelopmental conditions. Many families report positive experiences with melatonin's short-term benefits while awaiting more research on long-term use.

Autistic individuals and families should consider a range of approaches to sleep support, including sensory-friendly routines and environmental adjustments, in consultation with healthcare providers. 'The decision to use melatonin should be individualized and made collaboratively with autistic individuals when possible,' emphasizes a 2025 perspective in The Transmitter.