Buprenorphine (brand names: Simbadol, Buprenex) is an opioid pain reliever for cats. Clinically, it’s a partial opioid agonist analgesic. It is prescription-only and a DEA Schedule III controlled medication.
Most commonly used for short‑term pain control such as after surgery (including dental procedures) and for painful injuries. It may be given in the clinic as an injection, and some cats go home with a liquid placed in the cheek—your veterinarian can discuss the exact form, timing, and what to expect.
Common effects include sleepiness. If an owner reports severe lethargy, trouble breathing, or collapse, advise immediate emergency care and notify the veterinarian.
Front desk script: “Buprenorphine—also called Simbadol or Buprenex—is an opioid pain medicine for cats. It’s most often used for pain after surgery or dental work, and sometimes for injuries. It’s prescription‑only and a Schedule III controlled drug. Your veterinarian will tell you exactly how and when to give it and what to watch for. If your cat seems extremely sleepy, is hard to wake, or has any trouble breathing, please seek emergency care right away and call us.”
Buprenorphine is an opioid pain reliever used for cats. For home use it’s most often given as a small liquid into the cheek or under the tongue so it absorbs through the gums; swallowing it right away can make it work less well. Some clinics also use long-acting, in‑hospital only versions (e.g., Simbadol injection or Zorbium transdermal solution); your veterinarian will tell owners if any at‑home doses are still needed.
Common questions and quick answers:
- “How do I give it?” Place the liquid into the cheek pouch or under the tongue; don’t mix in food or water. If most of the dose is spit out or lost, do not re‑dose on your own—call the clinic for next steps.
- “How soon will it work and how might my cat act?” Onset is typically within 1–2 hours. Sleepiness is the most common effect; your veterinarian can discuss what’s expected for your cat.
- “Can I give it with other meds?” Many medicines (especially sedatives or other drugs that cause drowsiness) can interact. Have owners list all medicines and supplements so the veterinarian can advise.
- “Is this a controlled drug?” Yes—Schedule III. Instruct owners to store it locked up, track the amount, and never share with people or other pets.
Safety notes for triage: Expected effects include drowsiness. Less common reactions in cats can include behavior changes, vomiting, increased heart rate, or increased body temperature. If an owner reports very slow or difficult breathing, collapse, or the cat is non‑responsive, direct them to emergency care now. For moderate concerns (restlessness, repeated vomiting, or if a long‑acting hospital‑only product was applied and there’s human skin contact with the application site), advise same‑day veterinary guidance. When in doubt, your veterinarian can discuss risks, benefits, and monitoring.
Front desk script: This pain medicine is absorbed through the gums, so owners should squirt the liquid into the cheek or under the tongue and avoid mixing it with food or water. Sleepiness is common; if the cat seems excessively sedated, is vomiting repeatedly, or the dose was spit out, we’ll check with the doctor and call them back with guidance. If they notice very slow or difficult breathing or the cat collapses, they should go to the nearest emergency clinic immediately. Because this is a Schedule III controlled medication, please remind them to keep it locked away and never share it.
What owners most often report after a dose is sleepiness or acting extra calm, big pupils, and sometimes a short period of “happy cat” behavior (purring, rubbing, kneading). A small amount of drooling or foamy saliva right after an oral dose can happen and usually fades quickly; occasional vomiting can occur but is less common. These are generally expected effects, but your veterinarian can discuss what’s normal for that pet. ([vcahospitals.com](https://vcahospitals.com/crocker/know-your-pet/buprenorphine?utm_source=openai))
Less common calls include restlessness or agitation, constipation, or the cat feeling warmer than usual. Increased body temperature and behavior changes have been reported with some buprenorphine formulations used in cats; dilated pupils and constipation are also noted side effects. If the cat seems uncomfortably hot or the behavior changes are intense or don’t settle within a few hours, please alert the medical team the same day. ([fda.gov](https://www.fda.gov/animal-veterinary/cvm-updates/fda-approves-first-transdermal-buprenorphine-control-post-surgical-pain-cats))
Urgent red flags: slow, shallow, or difficult breathing; extreme lethargy (hard to rouse), collapse, or blue/pale gums. Also call promptly if vomiting is repeated, the cat won’t eat for 24 hours, severe agitation or aggression appears after dosing, or (if the owner checked) a temperature is 103°F or higher. These signs need immediate veterinary guidance; if breathing is affected, direct the owner to an emergency clinic now. ([vcahospitals.com](https://vcahospitals.com/crocker/know-your-pet/buprenorphine?utm_source=openai))
Front desk script: Thanks for calling—some drowsiness, big pupils, and brief drooling after buprenorphine can be expected, but I’m going to note everything you’re seeing for the medical team. If your cat has repeated vomiting, won’t eat for 24 hours, seems unusually hot, or the behavior changes are intense or ongoing, we’ll have a veterinarian advise you the same day. If you notice trouble breathing or your cat is very hard to wake, please go to the nearest emergency veterinary hospital now. Your veterinarian can discuss what’s expected for your cat and whether a check-in is needed.
Most take-home buprenorphine for cats is a tiny liquid dose placed in the cheek pouch or under the tongue so it can absorb through the gums. Do not mix it into food or water—if it is swallowed right away, it may not work as well. Aim the syringe into the side of the mouth (not straight to the back of the throat) and give it slowly; mild drooling or lip-licking can occur from the taste.
If a cat fights the syringe, try a towel wrap and a calm, slow approach. Your veterinary team can show the technique and can discuss compounding options such as flavored, higher‑concentration liquids or prefilled oral syringes to keep volumes small. If home dosing is not going well, your veterinarian can discuss in‑clinic options like long‑acting injectable (Simbadol) or the transdermal solution (Zorbium), which are applied only by trained clinic staff—not sent home.
Common effects include sleepiness. Store securely because this is a Schedule III controlled substance. Call the veterinarian the same day if the cat vomits more than once after dosing or you are unsure how much was actually given. Seek emergency care immediately for trouble breathing, severe unresponsiveness, or collapse; do not give extra doses. Always follow the prescribing veterinarian’s directions for your patient.
Front desk script: This medication works best in cats when the tiny liquid is placed in the cheek pouch to absorb through the gums—please don’t mix it with food or water. If your cat resists, we can demonstrate the technique and discuss flavored or more concentrated liquid options to make it easier. If most of a dose was spit out or your cat vomits more than once, give us a call before giving more. If you notice trouble breathing or extreme sedation, go to the nearest emergency vet right away.
Buprenorphine is an opioid pain reliever for cats and is a U.S. Schedule III controlled substance; every refill requires direct veterinarian authorization. Under federal rules, if the prescriber authorizes refills, Schedule III medications may be refilled up to five times within six months from the date written, but state law and clinic policy may be stricter. Some buprenorphine products are hospital‑use only and are not dispensed for at‑home use; for any take‑home formulation, do not promise refills—route all requests to the veterinarian for review. Your veterinarian can advise whether a recheck exam is needed before approving more medication. ([deadiversion.usdoj.gov](https://www.deadiversion.usdoj.gov/schedules/orangebook/c_cs_alpha.pdf))
Standard workflow: collect the pet’s name and DOB, owner name, medication name and concentration exactly as on the label, how many doses/days remain, any new medications or side effects, and the client’s preference for in‑clinic pickup or an outside U.S. pharmacy. For outside pharmacies, controlled substances generally require a written or electronic prescription; electronic prescribing of controlled substances (EPCS) is allowed when DEA requirements are met and may be required by state law—confirm the pharmacy’s full name, address, and phone, plus the client’s contact details for verification. Allow 1–2 business days for routine processing; flag “out of medication today/tomorrow,” new concerning side effects, or pharmacy verification issues for same‑day review. ([law.cornell.edu](https://www.law.cornell.edu/cfr/text/21/1311.100?utm_source=openai))
Online pharmacy guidance: only send to U.S.‑licensed pharmacies that require a valid veterinary prescription. Red flags include websites that don’t require a prescription or list no U.S. address/phone. If a client asks about online options, advise them that FDA recommends using licensed pharmacies and watching for these red flags; the veterinarian can discuss whether an external pharmacy is appropriate for this patient. If the caller reports severe sedation, unresponsiveness, trouble breathing, collapse, or human exposure, instruct them to seek emergency care immediately and notify the medical team. ([fda.gov](https://www.fda.gov/animal-veterinary/animal-health-literacy/need-pet-meds-protect-yourself-and-your-pet-be-website-aware?utm_source=openai))
Front desk script: “Thanks for calling about a buprenorphine refill for your cat. Because this is a Schedule III controlled medication, the doctor must approve each refill. I’ll confirm your cat’s name, the exact medication and strength on your label, how much you have left, any new side effects, and whether you want clinic pickup or an approved U.S. pharmacy. Please allow 1–2 business days; if you’re nearly out, I’ll mark this for same‑day review. If your cat is extremely sleepy, unresponsive, or having any breathing trouble—or if a person was exposed—please go to the nearest emergency clinic now and call us on the way.”
Escalate immediately if a cat on buprenorphine has any breathing trouble (very slow/shallow breaths, gasping), blue or pale gums, collapse, is extremely hard to wake, or shows severe wobbliness or sudden profound lethargy. Although uncommon, opioids can cause dangerous respiratory depression and profound sedation; treat these signs as an emergency. In cats, abnormal body temperature can occur with buprenorphine—particularly with the in‑clinic skin solution (Zorbium). If the cat feels very hot or very cold, or if there is persistent agitation, restlessness, continuous vocalizing, or repeated vomiting, get a veterinarian or go to emergency care now. Your veterinarian can help determine what is expected versus unsafe for this medication. ([petpoisonhelpline.com](https://www.petpoisonhelpline.com/poison/opioids-opiates/?utm_source=openai))
Watch for severe allergic reaction: sudden facial/lip/tongue swelling, hives, or trouble breathing—treat as an emergency. If there is any concern for overdose or an accidental extra dose, or if severe side effects occur, escalate to a veterinarian immediately. If Zorbium or injectable buprenorphine contacts a person’s eyes, mouth, or skin, this carries human safety risks; advise the caller to contact Poison Control (800‑222‑1222) while we connect them with a veterinarian. ([dailymed.nlm.nih.gov](https://dailymed.nlm.nih.gov/dailymed/fda/fdaDrugXsl.cfm?setid=c00709bf-12fd-40fc-9cff-7a7e7390fcb8&utm_source=openai))
Front desk script: What you’re describing can be an emergency with buprenorphine. I’m getting a veterinarian or technician on the line now—if your cat is struggling to breathe, is limp or unresponsive, or gums are blue or very pale, please head to the nearest emergency hospital immediately while I alert our team. If your cat seems extremely agitated, very hot or very cold, or is vomiting repeatedly, this also needs urgent veterinary assessment today. If anyone had skin, eye, or mouth contact with the in‑clinic buprenorphine skin solution, please call Poison Control at 800‑222‑1222; our veterinarian will advise you on the pet’s next steps.
Key interaction to watch: buprenorphine is a sedating opioid. If an owner mentions any other sedating medicine, flag it for the veterinarian. Examples include gabapentin; trazodone or benzodiazepines; tranquilizers/sedatives used around procedures (acepromazine, dexmedetomidine); other opioids (e.g., fentanyl); and “CNS depressants” in general. Certain drugs can also change buprenorphine levels or effects, including azole antifungals (e.g., ketoconazole/itraconazole), macrolide antibiotics (e.g., erythromycin), MAOIs (e.g., selegiline), phenobarbital, tramadol, metoclopramide, cisapride, and desmopressin—always hand off these mentions to the veterinarian. ([vcahospitals.com](https://vcahospitals.com/crocker/know-your-pet/buprenorphine?utm_source=openai))
Commonly co-prescribed in cats: robenacoxib/Onsior (NSAID) and maropitant/Cerenia (anti‑nausea) are often used with buprenorphine and typically don’t cause sedation; document and proceed, but the veterinarian will confirm. Gabapentin is also frequently paired; because it adds sedation, notify the veterinarian to confirm the plan and monitoring. Buprenorphine is a partial mu‑opioid agonist; it can affect how other opioids work, so any concurrent opioid use should be reviewed by the veterinarian. ([fda.gov](https://www.fda.gov/animal-veterinary/cvm-updates/fda-approves-first-transdermal-buprenorphine-control-post-surgical-pain-cats?utm_source=openai))
OTC human meds owners may give that need a flag: diphenhydramine/Benadryl (sedating antihistamine; adds to drowsiness with opioids) and cough medicines with dextromethorphan (can interact with opioids and serotonergic/MAOI products). If an owner reports severe sleepiness, very slow or shallow breathing, collapse, or bluish/pale gums after combining medicines, instruct them to seek emergency care immediately and alert the veterinarian. Your veterinarian can discuss safe combinations and next steps. ([vcahospitals.com](https://vcahospitals.com/foster/know-your-pet/diphenhydramine?utm_source=openai))
Front desk script: Thanks for letting me know about the other medication. Because buprenorphine can add to sedation, I’m going to note this and check with the veterinarian right away. If you notice your cat is extremely hard to wake, breathing very slowly or shallowly, or collapses, please go to the nearest emergency clinic now and call us on the way. For any other questions about using these together, our veterinarian can advise you on the safest plan.
Clinic stock: Simbadol (buprenorphine injection for cats) should be stored at or below 77°F (25°C), protected from light and from excessive heat above 104°F (40°C). After the first vial puncture, label the date and use within 56 days. Per the label, Simbadol is not to be dispensed for owner administration. Buprenex/generic buprenorphine injection should be stored at controlled room temperature (68–77°F/20–25°C), protected from prolonged light, kept in the carton until use, and not frozen. Most Buprenex units supplied to clinics are single‑dose ampules or cartridges—discard any remainder after use. For any compounded oral liquid sent home, storage and the beyond‑use date vary by pharmacy and formulation—have owners follow the directions printed on their label and do not use past the labeled discard date; your veterinarian can discuss specifics if there’s any uncertainty.
Owner safety at pickup: This is a Schedule III opioid. Instruct owners to store it locked and out of sight, in the original labeled container. Child‑resistant caps are not pet‑proof; cats and other pets can chew through containers. Do not leave medication in hot cars or in places that can freeze. Disposal: The preferred option is a drug take‑back drop box or mail‑back program. If no take‑back is available, buprenorphine is on FDA’s Flush List; flushing unused medication is recommended rather than keeping it at home. Never place loose needles/syringes in household trash—used sharps should go into an FDA‑cleared sharps container for proper disposal per local rules (the clinic can advise on options). If a child, adult, or another pet is accidentally exposed and becomes extremely sleepy, has slow or difficult breathing, or is unresponsive, call 911 or go to the nearest emergency room; for animals, contact our veterinarian or a 24/7 animal poison control service immediately.
Scheduling: Confirm the doctor’s reassessment plan before discharge. If a long‑acting, in‑clinic buprenorphine was used, note the product and time given: Simbadol injection (effect up to 3 days) or a transdermal buprenorphine solution applied by staff (effect about 4 days). Arrange any check‑ins the doctor requests while the medication is active and make sure the routine post‑op visit is booked; your veterinarian can discuss exact timing based on the procedure and the cat’s response. [References emphasize reassessment and document product durations.]
Monitoring: During recovery, the team monitors vitals; at home, ask owners to watch for expected sleepiness or behavior changes (euphoria/restlessness), appetite changes, stooling, and especially breathing. Cats can have body‑temperature changes with buprenorphine; hyperthermia is reported after both injectable and transdermal products, so advise owners to keep the cat in a calm environment and to call if the cat seems overheated or unusually cold. Slowed or labored breathing is uncommon with buprenorphine, but any trouble breathing, extreme unresponsiveness, collapse, blue/pale gums, or severe agitation/overheating warrants immediate emergency care. Your veterinarian can advise on any additional monitoring specific to the case.
Bloodwork and safety: Routine bloodwork is not generally required solely for short‑term buprenorphine use; the veterinarian will advise if labs are needed (for example, in cats with liver disease or when multiple drugs are used). Remind owners that buprenorphine is a DEA Schedule III controlled substance and to store any take‑home product securely; transdermal buprenorphine has human exposure warnings and is applied only by veterinary staff.
Front desk script: Our doctor prescribed buprenorphine to keep your cat comfortable. I’ll schedule the recheck per the doctor’s plan and note when today’s pain medication will wear off. At home, please watch for sedation, unusual behavior, changes in breathing, or signs of being too hot or too cold. If your cat has trouble breathing, is very hard to wake, collapses, or seems dangerously overheated, go to the nearest emergency clinic right away and call us on the way. Any questions about whether labs are needed or when to reassess pain can be answered by your veterinarian.
Buprenorphine is an opioid pain reliever for cats. In clinics it may be given as a long‑acting injection formulated for cats (Simbadol); veterinarians may also prescribe a buprenorphine liquid (from human‑labeled Buprenex) for use in cats as extra‑label use. It is a Schedule III controlled medication—store it securely, never share it, and keep it away from children and other pets. Only trained veterinary staff should administer clinic‑only products; if a human is accidentally exposed, seek medical care right away. Your veterinarian can discuss the specific formulation your cat is using and how to give it safely.
What owners may notice: mild sleepiness, large pupils, or quieter behavior are common. Less commonly, cats can have constipation, changes in body temperature, or unusual behavior (e.g., agitation or restlessness). If the caller reports trouble or slow breathing, blue/pale gums, collapse, unresponsiveness, severe or persistent vomiting, or an accidental extra dose was given, treat this as an emergency and direct them to the nearest emergency veterinary hospital while we alert the medical team. Do not advise starting, stopping, or changing how the medication is given—your veterinarian must guide any dosing questions or concerns.
Front‑desk notes: emphasize that refills require doctor approval because this is a controlled medicine and may take time to process. Avoid phrases like “it’s safe to give more,” “just stop it,” or “use your own pain meds at home.” Use a warm handoff to a nurse or veterinarian for any questions about dosing, timing, interactions, or side effects beyond basic expectations.
Front desk script: Thanks for calling [Hospital], this is [Name]. You’re calling about buprenorphine for your cat—this is a prescription opioid pain reliever; some sleepiness and big pupils can be normal as long as breathing is comfortable. If you notice labored or very slow breathing, your cat can’t be easily woken, has blue gums, collapsed, or got an extra dose, please head to the nearest emergency vet now and call us on the way. Because this is a Schedule III controlled medication, the doctor must approve any refills—may I place you on a brief hold to bring a nurse or the veterinarian on the line to review your cat’s plan? I can also schedule a call‑back or appointment today, whichever you prefer.