Fluoxetine Medication Guide: Information for Pet Owners

Schedule 4 (Prescription Only): Fluoxetine is a prescription medication registered for human use in Australia.

While the APVMA does not currently register it for specific use in animals, veterinarians may legally prescribe it "off-label" for dogs and cats when they determine it is the most appropriate clinical option. This medication must only be used under the direct supervision and prescription of a registered veterinarian.

For detailed technical data, you can view the official Product Information PI) or Consumer Medicine Information CMI) via the TGA Australian Register of Therapeutic Goods ARTG.

Fluoxetine is a prescription medication that your veterinarian may prescribe to support pets with various behavioural concerns, such as anxiety-related conditions.

It is typically used as one part of a comprehensive management plan that includes environmental changes and behavioural training. Because its use in pets is considered "off-label" in Australia, your veterinarian will determine the specific clinical application based on your pet's unique needs.

Fluoxetine belongs to a class of medications known as SSRIs Selective Serotonin Reuptake Inhibitors).

It works by increasing the availability of serotonin—a natural "feel-good" chemical —in the spaces between brain cells. By stabilising serotonin activity, the medication can help support emotional balance and mood regulation in animals.

• Tablets: Commonly available in a 20 mg strength, Fluoxetine Tablets may be split under veterinary instruction to achieve the precise dose required for your pet.
• Capsules: Often used for larger dogs where standard sizes are appropriate for their weight.
• Compounded Formulations: For pets that are difficult to medicate, a veterinarian may prescribe a flavoured liquid or chewable form created specifically by a compounding pharmacy.

Your veterinarian will determine the correct dose based on your dog's or cat's weight and clinical history.

Important Warning: Some human-branded liquid versions of fluoxetine contain Xylitol, which is highly toxic to dogs. Always ensure you use the exact formulation prescribed by your veterinarian. 

• Safety Parity Notice: While most pets tolerate fluoxetine well, it is important to monitor your pet for the following reactions:
• Appetite Changes: Pet owners should monitor cats for specific changes in appetite (anorexia), which is a common observation in the initial treatment phase.
• Digestive Upset: Some pets may experience mild vomiting or loose stools (Diarrhoea) particularly when first starting the medication.
• Energy Levels: Your pet may appear unusually tired or sleepy (Lethargy) during the initial few weeks of treatment.
• Initial Reactivity: Occasionally, pets may show a temporary increase in irritability or anxiety before the medication fully stabilises in their system.

This medication should generally not be used in the following circumstances:

• Seizure History: Fluoxetine is generally not suitable for pets with a history of fits or seizures (Epilepsy).
• Known Allergy: Do not use if your pet has a known hypersensitivity to fluoxetine or other SSRI medications.
• MAOI Use: It must not be administered to pets currently taking, or having recently taken, Monoamine Oxidase Inhibitors MAOIs).

The following conditions require careful consideration and monitoring by your vet:

• Organ Function: Caution is required if your pet has pre-existing liver issues (hepatic insufficiency) or kidney disease (renal impairment).
• Drug Interactions: Tell your vet about all other medications, especially other behaviour drugs or certain pain relievers NSAIDs, to avoid interactions.
• Stopping Treatment: Never stop this medication abruptly; a gradual reduction (Tapering schedule) is essential to prevent a "rebound" of symptoms.
• Diabetes: In diabetic pets, fluoxetine may affect blood glucose levels, requiring closer monitoring of insulin requirements.

• Temperature: Store at room temperature (ideally between 15°C and 30°C) in a dry area away from direct sunlight.
• Security: Keep the medication in its original child-resistant container and store it strictly out of reach of children and other animals.
• Moisture: Avoid storage in bathrooms or laundry areas, as high humidity can affect the stability of the tablets or capsules.

How long does it take for Fluoxetine to work?
Fluoxetine is not a "rescue" drug for immediate relief; it typically takes 4 to 8 weeks of daily use to reach a steady-state in the bloodstream and show therapeutic results.

Does it change my dog's personality?
When dosed correctly, it is designed to lower your pet's baseline anxiety so their true personality can emerge, rather than making them feel "drugged" or sedated.

Can my pet stay on this medication long-term?
Many pets with chronic anxiety stay on fluoxetine for extended periods under veterinary supervision, usually involving annual health checks and blood tests to monitor their wellbeing.

If your veterinarian has determined that Fluoxetine is appropriate for your pet and has issued a valid Australian prescription, you can fulfil it through our pharmacy service.

Learn more about VLP Pharmacy and the prescription ordering process medications like Fluoxetine.

Disclaimer: This information is for educational purposes only and does not replace professional veterinary advice. Always consult your veterinarian before starting any new medication for your pet.