Plain melatonin is generally considered to have a wide safety margin in dogs, but the whole product decides the risk. Melatonin calming supplements are sold over the counter in Australia, so read every label — inactive ingredients such as xylitol in human products, plus your dog’s health and medicines, matter as much as the melatonin itself.
Side effects and interactions
The most common effect is drowsiness; sometimes digestive upset. Melatonin can interact with sedative medicines, and pregnancy, puppies, seniors, and health conditions all change the picture (VCA) — reasons to involve your vet.
| Active ingredient | Per 1 mL |
|---|---|
| Melatonin | 3 mg |
| L-theanine | 50 mg |
| Alpha-casozepine | 25 mg |
| Water-soluble chamomile extract | 25 mg |
| Elemental magnesium | 5 mg |
| Vitamin B6 (as P5P) | 0.5 mg |
Manufacturer-supplied formulation for Pure Majesty Pets Melatonin for Dogs, published on the product page and current as of July 2026. As a companion-animal supplement it can be used to help support calmness in healthy dogs; the amounts describe the contents and do not by themselves prove a calming or sleep outcome, and this exact six-active blend has not been tested in a published canine trial. Confirm availability and shipping to Australia before ordering.
Frequently asked questions
Is melatonin safe for dogs in Australia?
What poison line do I call in Australia?
Can melatonin harm my dog?
Sources
- Merck Veterinary Manual. Toxicoses in animals from human antidepressants, anxiolytics, and sleep aids. Full review May 2025. merckvetmanual.com
- U.S. Food & Drug Administration. Paws Off Xylitol; It’s Dangerous for Dogs. Consumer update. fda.gov
- VCA Animal Hospitals. Melatonin. Hamilton A, Gollakner R. vcahospitals.com
- Cohen PA, Avula B, Wang Y, Katragunta K, Khan I. Quantity of melatonin and CBD in melatonin gummies sold in the US. JAMA. 2023;329(16):1401–1402. doi:10.1001/jama.2023.2296