Melatonin is not as well-studied in cats as in dogs. While it's sometimes used by vets for sleep disorders and anxiety in cats, the evidence base is much smaller. The critical warning applies equally to cats: many melatonin supplements contain xylitol — which is toxic to cats. Always check the label and get vet guidance before giving.
⚠️ Always consult your vet
Never give human medications to pets without veterinary guidance. Dosing errors can be dangerous.
Dose Guide by Weight
General reference ranges only. Always confirm with your vet before giving.
| Dog Size | Dose | Frequency |
|---|---|---|
| Any product | Check for xylitol first | Never if xylitol present |
| Cats under 5 lbs | 0.5–1mg | 30 min before event — vet guidance only |
| Cats 5–10 lbs | 1–1.5mg | 30 min before event — vet guidance only |
| Cats over 10 lbs | 1.5–3mg max | 30 min before event — vet guidance only |
ℹ️ Cat melatonin dosing is not well-established. These ranges are general veterinary guidelines — always get specific guidance from your vet before giving melatonin to your cat.
Never Use These
- Any supplement containing xylitol — common in chewables and liquids; lethal to cats
- Melatonin with valerian or other herbs — some herbs are toxic to cats (e.g. pennyroyal)
- Long-term daily use without vet monitoring
- Giving to pregnant or nursing cats — safety not established
- Replacing veterinary diagnosis with melatonin for sleep disorders
Potential Uses
- Stress and anxiety from environmental changes (new pets, moving house)
- Sleep disturbances in older cats with cognitive dysfunction
- Travel anxiety — though cats often respond better to Feliway (pheromone diffuser)
- Under direct veterinary supervision for specific conditions
Side Effects to Monitor
Frequently Asked Questions
It's considered generally low-risk in appropriate doses, but the evidence is limited compared to dogs. Always get vet guidance and check the supplement for xylitol.
Xylitol in the supplement — many human melatonin products contain xylitol, which is toxic to cats. The melatonin itself is low risk; the additive is the danger.
Yes — cats are more prone to paradoxical reactions (becoming more agitated rather than calmer). The predictability is lower than in dogs.
Feliway (synthetic feline facial pheromone) diffusers are often more effective and evidence-based for cat anxiety. Veterinary prescriptions like gabapentin are also commonly used.
Not recommended — kittens' developing neurological systems make melatonin supplementation inappropriate. Never give to cats under 6 months without specialist guidance.