Melatonin and trazodone are not two versions of the same remedy. Melatonin is a hormone sold as a dog supplement that gently helps a dog settle. Trazodone is a prescription-only human medicine your vet prescribes after an examination, and it produces real, visible sedation. For mild, predictable stress, melatonin is the right first step. For severe noise phobia, enforced crate rest after surgery or a diagnosed anxiety disorder, there is no way around the vet.
Most Australian owners arrive at this question from one of two directions: New Year's Eve fireworks are coming and last summer was rough, or the vet has mentioned trazodone and you would like to try something gentler first. Both are reasonable. Here is the straight comparison, in kilograms, including the places where melatonin simply is not enough. If melatonin fits your dog, Pure Majesty Pets Melatonin Drops are A$47 with free worldwide shipping, delivered to Australia with duties and GST prepaid (DDP), so there is nothing to pay on delivery. The separate guide, Melatonin for Dogs During Fireworks & Storms in Australia: What 1,225 Owners Reported Actually Worked, explains the choices in more detail.
What is the difference between melatonin and trazodone?
Melatonin: a signal, not a sedative
Melatonin is a hormone your dog's pineal gland already produces in step with light and dark. Giving it reinforces the body's own "it is night" signal. As a dog supplement it is easy to buy, and it is widely regarded as non-habit-forming. What it does not do is switch a dog off. It lowers arousal and makes rest more likely, but it will not override a dog that is already in full-blown panic.
Trazodone: a medicine that genuinely sedates
Trazodone is a serotonin antagonist and reuptake inhibitor (SARI), originally an antidepressant for people. Your vet prescribes it for dogs on an individual basis, which requires a clinical examination. The Merck Veterinary Manual and veterinary behaviourists describe it as a common option for situational anxiety and post-operative confinement. It sedates visibly, which is precisely why it is used and precisely why it needs a prescription.
The deciding difference
Melatonin changes the conditions under which a dog can settle. Trazodone lowers the dog's ability to stay wound up at all. If you need "calmer", melatonin may be enough. If a German Shepherd has to lie quietly for six weeks after cruciate surgery, it will not be. The separate guide, Melatonin vs Trazodone for Dogs in Australia: Which Calming Option Fits? (2026), explains the choices in more detail.
Melatonin vs trazodone: side-by-side comparison
| Melatonin | Trazodone | |
|---|---|---|
| Status in Australia | Dog supplement, order online without a script | Prescription-only, human medicine prescribed by your vet |
| How it works | Reinforces the natural sleep-wake signal | Modulates serotonin, produces sedation |
| Onset | About 15 to 30 minutes (liquid fastest) | About 1 to 2 hours, usually given 90 minutes ahead |
| Duration | About 8 hours | About 4 to 8 hours, highly variable |
| Strength | Mild, lowers arousal | Moderate to strong, visible sedation |
| Typical use | Restless nights, car trips, the groomer, mild noise unease, seniors waking at night | Severe New Year's Eve and storm fear, panic at the clinic, crate rest after surgery, diagnosed anxiety disorder |
| Common side effects | Drowsiness, occasionally a mild tummy upset | Sedation, wobbliness, tummy upset, panting, rarely paradoxical agitation |
| Serious risks | Very few, wide safety margin | Serotonin syndrome when combined; caution with heart and liver disease |
| Cost | Low: Pure Majesty drops A$47, free shipping, duties and GST prepaid | Tablets are cheap; the consult is the cost |
| Availability | Order today | Appointment needed, before Christmas, not on 30 December |
When is melatonin the right first step?
- Restless nights. A dog that is slow to settle, keeps getting up or has fallen out of rhythm. This is exactly what melatonin is made for. When tracking unsettled nights, note whether extra bathroom trips are part of the pattern. If bladder support is being considered after assessment, our guide to bladder-support ingredients and product labels helps you review that separate product choice.
- Car trips. Mild anticipation anxiety, given 30 minutes before you leave, handy for a long summer holiday drive up the coast.
- Groomer, nail trims, visitors. Short, predictable stressful moments in a nervous dog that is not phobic.
- Mild noise unease. A dog that pants and paces on New Year's Eve but recovers. A dog trying to dig through a door belongs with the vet, not on a supplement.
- Older dogs with disturbed sleep. Often the first thing to try, alongside a check for pain or cognitive dysfunction. More in our guide to melatonin for senior dogs. Considering CBD as another part of a comfort plan? The CBD oil comparison lets you compare mg per mL and testing details before discussing a product with your veterinarian. For the comparison criteria behind this choice, see Grooming Tips for Older Dogs: Senior Dog Care Guide for Australia. For a closer look at the question raised here, read Best Melatonin for Dogs to Sleep in Australia (2026): How to Choose and Use It.
- Mild separation anxiety, alongside training and never instead of it. See melatonin for separation anxiety.
Melatonin dosage by weight
Dose by body weight. The bands below match the ranges given by VCA Animal Hospitals, PetMD and the Merck Veterinary Manual, each with the equivalent volume of a 3 mg/mL liquid such as our drops.
| Dog's weight | Usual melatonin dose | Volume at 3 mg/mL | Maximum frequency |
|---|---|---|---|
| Under 4.5 kg (Chihuahua, Pomeranian) | ≈ 1 mg | ≈ 0.33 mL | Up to 3× daily |
| 4.5 to 11 kg (Jack Russell, Cavalier) | ≈ 1.5 mg | ≈ 0.5 mL | Up to 3× daily |
| 12 to 45 kg (Border Collie, Labrador, Kelpie, German Shepherd) | ≈ 3 mg | ≈ 1 mL | Up to 3× daily |
| Over 45 kg (Great Dane, Mastiff) | 3 to 6 mg | ≈ 1 to 2 mL | Up to 3× daily |
Give it about 30 minutes before bed or before the trigger, start at the low end and wait three or four evenings before you judge it. The full chart is in our melatonin dosage chart for dogs.
When does your dog need trazodone instead?
Being clear about where melatonin stops is more useful than overselling it. Call your vet clinic if:
- your dog is in genuine panic during fireworks or storms: destroying doors, escaping, trembling uncontrollably, injuring itself;
- your dog must keep to crate rest after orthopaedic surgery and cannot be kept quiet by management alone;
- vet visits are so stressful that an examination becomes unsafe for the dog or the team;
- a veterinary behaviourist has diagnosed an anxiety disorder that needs medication;
- melatonin and other over-the-counter support have been tried properly and achieved nothing.
A practical note for Australia: the critical night is New Year's Eve, in the middle of summer, and December is the busiest month for vet and behaviour appointments. If last New Year's Eve was bad, book in October or November, not on 30 December. Trazodone must not be casually combined with SSRIs, tramadol or other serotonergic drugs; the risk is serotonin syndrome, a genuine emergency. That is exactly why it is prescription-only.
Can melatonin and trazodone be given together?
Some vets combine the two, and melatonin is not serotonergic in the way tramadol or an SSRI is. Even so, that is a decision for your vet, not a home experiment. Both cause drowsiness, so combined sedation can be stronger than expected. And a dog on trazodone is by definition under veterinary care, so anything extra should go through the same person. Ask at the appointment; the answer takes thirty seconds. The separate guide, Benadryl vs Melatonin for Dogs in Australia: What a 56-Dog Sedation Trial Found, explains the choices in more detail.
How melatonin compares with other calming options sold in Australia
Walk into Petbarn or Petstock, or browse Pet Circle, and you will find a wall of calming products. A few you will see most often: If coughing is limiting a walk, raise that separately from the mobility or stamina question. Our respiratory supplement comparison explains this product category and its limits after the cause has been assessed.
| Product | What it is | Price seen (AUD) |
|---|---|---|
| Pure Majesty Pets Melatonin Drops | Liquid: melatonin 3 mg/mL plus L-theanine, alpha-casozepine, chamomile, magnesium, vitamin B6 | A$47, free shipping, duties and GST prepaid |
| Zylkene 225 mg (10 to 30 kg) | Capsules of alpha-casozepine only | A$95.14 RRP for 30 capsules (Petstock) |
| Adaptil Calm diffuser refill | Pheromone diffuser refill, 48 mL | A$116.99 (Petbarn) |
| PAW Complete Calm Chews | Soft chews from Blackmores' PAW range | A$38.97 for 300 g (Petstock) |
Alpha-casozepine on its own costs more than double our bottle, yet our drops already include 25 mg of alpha-casozepine per mL alongside melatonin and L-theanine. A diffuser can help in one room but goes nowhere with you in the car. That is why we built one liquid that covers the sleep signal and daytime calm together. For a closer look at the question raised here, read Best Liquid Melatonin for Dogs in Australia: How to Choose Drops (2026).
A melatonin worth starting with
If melatonin is the sensible first step, the formulation matters. Human melatonin is a poor fit: usually 5 or 10 mg per tablet, impossible to split accurately for a Cavalier, and often sweetened with xylitol, which is acutely toxic to dogs.
Our Melatonin for Dogs – Calming & Sleep Support Drops (A$47) are liquid, so you can measure 0.33 mL for a 4 kg terrier or 1 mL for a 30 kg Labrador from the same bottle. The formula is xylitol-free, made in North America, free of artificial dyes, and every active is declared per millilitre instead of hidden in a proprietary blend:
| Active (per 1 mL) | Amount | Commonly associated with |
|---|---|---|
| Melatonin | 3 mg | Sleep-wake cycle signal |
| L-theanine | 50 mg | Relaxed alertness without sedation |
| Alpha-casozepine | 25 mg | Milk peptide used in calming formulas |
| Chamomile extract (water-soluble) | 25 mg | Traditional calming botanical |
| Magnesium (elemental) | 5 mg | Normal nerve and muscle function |
| Vitamin B6 (as P5P) | 0.5 mg | Cofactor in melatonin synthesis |
The multi-active approach is deliberate: melatonin handles the sleep signal, while L-theanine and alpha-casozepine are the ingredients most often associated with daytime calm, which is exactly where plain melatonin disappoints most owners. A liquid is also absorbed faster than a chew that has to break down first. Compare options in our guide to the best melatonin for dogs and in the complete guide to dog calming and anxiety. Shipping is free worldwide, Australia included, with duties and GST prepaid. Under APVMA rules a supplement may not claim to treat a disease, so we describe these drops honestly as calming and sleep support. For the comparison criteria behind this choice, see Best Calming Supplement for Thunderstorm Anxiety in Dogs: Australia 2026.
Common mistakes
- Expecting trazodone results from melatonin. If you need visible sedation, melatonin will seem useless. That was never its job.
- Leaving the appointment until late December. Clinics are booked out. Sort it out in spring.
- Reaching for the packet in your own bathroom. Check for xylitol first, and note that the per-tablet dose is almost always too high for a small dog.
- Giving it too late. Melatonin needs 30 minutes, trazodone usually 90. Given mid-panic, both disappoint.
- Combining on your own. Stacking two sedating products yourself is how you end up with a staggering dog.
- Replacing management with a product. An inside room, closed blinds, background noise, a den-like spot and desensitisation training in the months before do more on New Year's Eve than any product given on the night.
When to call your vet
Talk to your clinic first if your dog is pregnant or nursing, is a puppy, already takes medicines (especially SSRIs, tramadol, sedatives or anti-epileptics), has heart, liver or kidney disease, or is diabetic.
Book promptly if anxiety is increasing rather than staying situational, if your dog injures itself or damages the house during storms, if an older dog develops new night-time restlessness (that can point to pain, cognitive dysfunction or a hormonal disorder rather than a sleep problem), or if melatonin at a sensible dose has done nothing after two weeks. The RSPCA Australia Knowledgebase and the AVA's Vet Voice site are good local starting points for owner information.
Emergency, call your vet or the nearest after-hours emergency clinic now, if a dog on trazodone becomes severely disoriented, trembles, develops a racing heart or collapses, or if your dog has eaten a human product containing xylitol.
Frequently asked questions
Can I get trazodone for my dog without a vet script?
No. Trazodone is a prescription-only medicine and was developed as a human antidepressant, so your vet prescribes it for an individual dog after a clinical examination. A consult is unavoidable, which is exactly why it pays to book well before New Year's Eve.
Can I buy melatonin for my dog in Australia without a prescription?
Yes, as a dog supplement. Pure Majesty Pets Melatonin Drops are made for dogs, ship free worldwide and arrive in Australia with duties and GST prepaid (DDP) for A$47. Human melatonin tablets are a poor substitute: the dose per tablet is usually far too high for small dogs and some forms contain xylitol.
Is melatonin enough for New Year's Eve fireworks?
It depends on severity. For a dog that pants, paces and hides but recovers afterwards, melatonin given about 30 minutes before dark, together with an indoor room, background noise and closed blinds, is often enough. For a dog that panics, escapes or injures itself it is not enough; that dog needs a vet plan, weeks in advance.
How much melatonin for a 10 kg dog?
A 10 kg dog falls in the 4.5 to 11 kg band, so roughly 1.5 mg, about 0.5 mL of a 3 mg/mL liquid, up to three times a day, around 30 minutes beforehand. Start low and agree it with your vet, especially if your dog takes other medicines.
If your dog's stress sits in the mild to moderate range (restless nights, car trips, the groomer, fireworks in the distance), a formula built specifically for dogs is the right place to start. Pure Majesty Pets Melatonin Drops for dogs are xylitol-free, declared per millilitre, made in North America and dosable to the drop from a 3 kg Chihuahua to a 50 kg Great Dane, for A$47 with free worldwide shipping and duties and GST prepaid to Australia. And if it is not enough, you walk into the consult far better informed.
This article is for information only and does not replace advice from a veterinarian. Supplements are not intended to diagnose or treat any disease. Melatonin drops are a nutritional supplement, not a registered veterinary medicine. Always consult your veterinarian before adding melatonin or any other supplement to your dog's routine, especially if your dog is pregnant, on medication or has a health condition.