Trazodone for Dogs & Cats: Anxiety & Sedation Guide

This information is for educational purposes only. Never give your pet any medication without your veterinarian's guidance. Dosing, frequency, and safety depend on your pet's specific health profile.

Trazodone is a serotonin antagonist and reuptake inhibitor (SARI). In veterinary medicine, your vet may prescribe it to help reduce anxiety, lower arousal, and provide mild to moderate sedation for stressful events or recovery periods. It is a human medication used extra-label in pets, which is common in veterinary practice.

In dogs, trazodone is often used for fear- and anxiety-related situations like fireworks, thunderstorms, travel, hospitalization, grooming, and veterinary visits. It is also commonly used after surgery when a dog needs help staying calm during restricted activity. In cats, it is used most often for situational anxiety, especially before car rides or veterinary appointments.

Trazodone does not cure the underlying cause of fear or anxiety on its own. Instead, it can make a pet calm enough for safer handling, better rest, and behavior work. Some pets take it only before stressful events, while others may use it on a regular schedule if your vet feels that fits the situation.

Your vet may use trazodone for short-term anxiety relief, sedation support, or as part of a broader behavior plan. Common reasons include separation-related distress, noise phobia, travel anxiety, veterinary or grooming visits, hospitalization, and support for calm confinement after surgery or injury.

In dogs, published veterinary references list uses for anxiety disorders, compulsive behaviors, fear aggression, and sedation or anxiolysis around veterinary care. In cats, veterinary references most often describe trazodone as a pre-visit or pre-travel medication, usually given before a known stressor rather than as a long-term daily medication.

Trazodone is often one part of a larger plan. Depending on your pet's needs, your vet may pair it with environmental changes, training or behavior modification, pheromones, pain control, or another medication. That matters because a pet who is painful, nauseated, or overstimulated may not respond well to sedation alone.

Always follow your vet's exact instructions. Trazodone dosing varies by species, body weight, health conditions, and the goal of treatment. In dogs, Merck Veterinary Manual lists an extra-label range of 2-7.5 mg/kg by mouth every 8-24 hours as needed, with a maximum of 19.5 mg/kg in any 24-hour period. In cats, Merck lists 50-100 mg per cat by mouth once, about 90 minutes before a stressful event.

For event-based use, trazodone is commonly given 1-2 hours before the trigger, such as a car ride, fireworks, or a veterinary visit. For daily use, your vet may start lower and adjust gradually based on response. Some pets become calm and sleepy at lower doses, while others need careful adjustment to get the desired effect without too much sedation.

Give trazodone exactly as labeled. It may be given with or without food, but giving it with a small meal or treat can help if your pet gets stomach upset. Do not change the dose, combine it with other calming medications, or stop a long-term schedule abruptly unless your vet tells you to. If your pet has liver disease, kidney disease, heart disease, glaucoma, pregnancy concerns, or is taking other behavior medications, your vet may change the plan.

The most common side effects are sleepiness, lethargy, wobbliness, and stomach upset. Dogs may have nausea, vomiting, diarrhea, or seem unusually quiet after a dose. Some pets become unsteady on their feet, so stairs, jumping, and slippery floors may need extra supervision until the medication wears off.

Less common but important reactions include agitation, restlessness, increased anxiety, faster heart rate, aggression, urinary changes, or collapse. Rare reports include liver injury and priapism in dogs. Cats may also show reduced appetite or seem more withdrawn than expected.

See your vet immediately if you notice signs that could fit serotonin syndrome, especially if trazodone was combined with other serotonin-affecting drugs. Warning signs can include vomiting, diarrhea, tremors, seizures, high body temperature, dilated pupils, excessive drooling, trouble breathing, disorientation, blindness, or severe weakness. If your pet seems overly sedated, cannot stand, or you think an overdose happened, contact your vet or an emergency clinic right away.

Trazodone can interact with other medications that affect serotonin, blood pressure, heart rhythm, or sedation level. The biggest concern is combining it with other serotonergic drugs, which can raise the risk of serotonin syndrome. That includes some SSRIs, TCAs, MAO inhibitors, tramadol, trazodone-containing compounded combinations, and certain supplements.

VCA specifically warns that trazodone should not be used with MAO inhibitors and should be used carefully in pets with severe heart disease or angle-closure glaucoma. Your vet may also be cautious if your pet takes fluoxetine, clomipramine, sertraline, amitriptyline, selegiline, tramadol, mirtazapine, or other sedating medications such as gabapentin, benzodiazepines, or some pain medicines.

Before starting trazodone, give your vet a full list of everything your pet gets: prescriptions, over-the-counter products, calming chews, CBD products, supplements, flea and tick preventives, and compounded medications. Even products marketed as natural can matter. If another clinic prescribes something new, let them know your pet already takes trazodone.