Trazodona para Cães e Gatos: Gerenciando Ansiedade e Medo
A trazodona é um medicamento amplamente utilizado para ansiedade situacional, fobias de ruído e estresse em animais. Saiba como funciona e quando é apropriado.
Trazodone is an atypical antidepressant and anxiolytic that has become one of the most commonly prescribed behavioral medications in veterinary medicine. It reliably and safely induces sedation and reduces anxiety in dogs and cats, making it useful for treating acute fear, stress, and anxiety. Unlike some behavioral medications, trazodone works quickly (within 1-2 hours) and is well-tolerated by most pets. Source: Clinician's Brief, December 2025.
Key Points
- Trazodone takes effect within 1-2 hours and lasts 4-8 hours — ideal for situational anxiety
- Common uses: separation anxiety, noise phobias (fireworks, thunderstorms), vet visits, travel, post-surgery confinement
- The recommended starting dose for dogs is 2-3 mg/kg, titrated up based on response
- Trazodone can be safely combined with daily anxiety medications (SSRIs, TCAs) for enhanced effect
- Side effects are uncommon but may include mild sedation, gastrointestinal upset, or ataxia at higher doses
- Always do a test dose at home before using trazodone for the first time in a stressful situation
How Trazodone Works
Trazodone acts on serotonin receptors in the brain. At lower doses, it primarily provides sedation by blocking certain serotonin and histamine receptors. At higher doses, it also inhibits serotonin reuptake, providing anti-anxiety effects. This dual mechanism makes it versatile — low doses help with mild sedation (e.g., post-surgery rest), while higher doses address genuine anxiety (e.g., noise phobias, separation distress).
When to Use Trazodone
Trazodone is most useful for situational anxiety — predictable stressful events like thunderstorms, fireworks, vet visits, grooming, travel, or post-operative confinement. It is less suitable as a long-term daily medication because its effects can diminish with continuous use. For chronic anxiety conditions (e.g., severe separation anxiety), trazodone is typically used as an add-on to a daily medication like fluoxetine or sertraline.
Administration and Dosing
Trazodone should be given 1-2 hours before the anticipated stressful event. For dogs, the starting dose is typically 2-3 mg/kg, which can be increased based on response. For cats, doses are generally lower. Always give with food to reduce stomach upset. The first dose should be tested at home during a calm period to observe your pet's individual response before using it during an actual stressful event.
Safety and Side Effects
Trazodone is generally very safe. Reported side effects (in <10% of dogs) include mild sedation, gastrointestinal upset (vomiting, diarrhea), and rare ataxia (wobbly walking) at higher doses. It does not impair the immune response to vaccination. Trazodone should be used cautiously in pets with heart disease, liver disease, or those taking MAO inhibitors. Always inform your veterinarian of all medications your pet is taking.
When to See a Vet Immediately
- Your pet shows severe anxiety during thunderstorms, fireworks, or other loud events
- Your pet becomes destructive or injures themselves when left alone
- Your pet is excessively fearful during vet visits or travel
- Your pet needs calming for post-surgical recovery and confinement
- You want to discuss whether trazodone is appropriate for your pet's specific anxiety
- Your pet experiences side effects from trazodone — vomiting, excessive sedation, or unusual behavior
How RVC Can Help
Royal Veterinary Center can prescribe trazodone and other anti-anxiety medications tailored to your pet's needs. Our behavioral medicine team assesses each case individually and creates customized treatment plans. We can also demonstrate proper administration techniques and help you create a desensitization protocol to work alongside medication. For emergencies during holidays (fireworks season), we recommend planning ahead. Call +853 6677 6611 for a behavioral consultation.
This article is for educational purposes only and does not replace professional veterinary advice. If your pet is showing any symptoms, please contact Royal Veterinary Center immediately at +853 6677 6611.