Buprenorphine is an opioid pain medicine that veterinarians may use for acute or postoperative pain in cats. There is no single safe dose to apply to every cat: the right product, concentration, route, and schedule depend on the prescription. Do not calculate or change a dose from a general online range; contact the prescribing clinic if your cat has an unexpected reaction.
What is buprenorphine used for in cats?
Buprenorphine is an opioid analgesic. It acts on pain receptors in the central nervous system and is classified as a partial agonist/antagonist opioid. Veterinarians use it to manage pain, including acute and postoperative pain; the appropriate use depends on the specific formulation. Merck Veterinary Manual lists it among analgesics used in cats, and the FDA describes its opioid pain-relief action.
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Why does the dose depend on the formulation?
Products that contain buprenorphine are not interchangeable. Concentration, route, dosing interval, and indication all matter. A dose or schedule for one formulation must not be transferred to another, and a veterinarian must select a regimen for the individual cat.
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Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →| Formulation or product context | Reference information | Key distinction |
|---|---|---|
| Conventional 0.03% solution | Merck lists 0.01–0.03 mg/kg IV, IM, or transmucosally every 4–8 hours. | This is a reference range, not a dosing instruction for an individual cat. The prescribing veterinarian determines the route and regimen. |
| Concentrated 2% transmucosal formulation | Merck lists it separately from conventional solution. | Do not infer a dose from the conventional product. Merck specifically cautions against confusing feline 1.8 mg/mL concentrated injection dosing with the 0.3 mg/mL human injection. |
| Simbadol | The FDA approval summary describes a labeled 0.24 mg/kg subcutaneous dose every 24 hours for three days for postoperative pain. | This is product-specific and is not the regimen for conventional 0.3 mg/mL injectable buprenorphine. The supporting randomized, double-masked, placebo-controlled field study enrolled 221 client-owned cats. |
| Zorbium | One application provides pain relief for four days, according to the FDA. | This long-acting topical product is applied at the base of the neck by trained veterinary personnel in a hospital; it is not dispensed for owners to apply at home. |
The conventional and product-specific figures above come from Merck Veterinary Manual, whose analgesics review was last updated in September 2024, and FDA materials for Zorbium and Simbadol. They are not a home dosing calculator. Use only the product and instructions provided by your veterinarian; do not repeat, adjust, or stop a dose based on a generic range.
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How long does buprenorphine last?
Duration varies with the formulation and prescribed schedule. The FDA states that a single Zorbium application provides four days of pain relief. Conventional products and other long-acting products have their own routes and intervals; the Zorbium duration should not be assumed for them. For Zorbium, trained veterinary staff apply the product in the hospital, rather than sending it home for owner administration.
What side effects should you watch for?
Possible effects vary with formulation and clinical context. A cat may be sleepy or show changes in behavior, appetite, temperature, blood pressure, heart rate, or breathing; vomiting is also listed in owner guidance. Contact the prescribing clinic if an effect concerns you, especially if your cat is unusually agitated or very sedated, or has breathing difficulty.
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Reactions reported with Zorbium
In its Zorbium materials, the FDA reports perioperative observations including high or low temperature, high or low blood pressure, fast heartbeat, and sedation. Similar reactions also occurred in control-group cats and can be associated with anesthesia and surgery. After cats were awake, reported observations included temperature and blood-pressure changes, sedation, and increased breathing rate. In the days after surgery, increased body temperature was the most common adverse reaction among cats given Zorbium. Safety studies also observed dilated pupils, constipation, and behavior changes such as hyperactivity, agitation, restlessness, or aggression. The FDA notes this product-specific evidence in its 2022 approval update.
Health conditions and other medicines
Tell the veterinarian about your cat’s medical history and every medicine or product it receives. VCA advises particular caution with liver or kidney disease, heart or lung disease, thyroid or bile disease, and neurologic problems, and says buprenorphine should not be used with amitraz products. The prescribing veterinarian can assess whether these factors affect your cat’s treatment. See VCA’s buprenorphine guidance.
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Safe handling and when to call the clinic
Buprenorphine is an opioid and carries human exposure and misuse risks. The FDA classifies Zorbium as a Schedule III opioid and describes a boxed warning addressing abuse potential and human exposure. Zorbium is for administration by trained veterinary personnel in a hospital, not for home application. For any medication dispensed for home use, follow the clinic’s storage and handling directions and avoid contact with topical product.
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- Call the prescribing clinic promptly if your cat is overly sedated, unusually agitated, has difficulty breathing, or shows another concerning change.
- Do not give an extra dose, alter the amount or interval, or discontinue treatment without veterinary direction.
- If you are unsure which product or concentration you have, check the label with the clinic before administering it.
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