Carprofen Drug Interactions: Checker for 20+ Medicines
Published 2026-05-08 · Updated 2026-10-19
Most dogs on carprofen also take something else: a joint supplement, gabapentin, a heart medicine, an allergy tablet. Most combinations are fine, a few need monitoring, and two (other NSAIDs and steroids) should never be given alongside carprofen unless your vet plans it. This guide lists the medicines and supplements owners ask about most, and what to do about each.
Carprofen Interaction Checker
| Medicine or supplement | Combine? | Why |
|---|---|---|
| Other NSAIDs: aspirin, ibuprofen (Advil), naproxen (Aleve), meloxicam (Metacam), deracoxib, firocoxib, robenacoxib, ketoprofen | Do not combine | Two NSAIDs together sharply raise the risk of stomach ulcers, bleeding and kidney injury. Never give a human painkiller on top of carprofen. |
| Steroids: prednisone, prednisolone, dexamethasone, methylprednisolone | Do not combine | Steroids plus an NSAID is one of the best-known causes of stomach ulcers in dogs. Switching between them needs a planned gap. |
| Bismuth subsalicylate (Pepto-Bismol), willow bark | Avoid | Both contain salicylates, which act like aspirin. |
| Galliprant (grapiprant) | Do not combine | Not an NSAID, but it acts on the same prostaglandin pathway, so the two are used one after the other, not together. |
| Diuretics: furosemide (Lasix), torsemide, spironolactone | Vet-supervised | Diuretics reduce blood volume, and NSAIDs reduce the kidneys' ability to cope with that. They are used together in some dogs, with kidney monitoring. |
| ACE inhibitors: enalapril, benazepril | Vet-supervised | Together with an NSAID they can reduce kidney blood flow. The risk is highest when a diuretic is used as well. |
| Pimobendan (Vetmedin) | Vet-supervised | No direct interaction is known, but dogs on it usually have heart disease and are often on furosemide and an ACE inhibitor too, which is where the kidney risk comes from. |
| Amlodipine and other blood pressure drugs | Vet-supervised | No major direct interaction, but high blood pressure in dogs is often linked to kidney disease, and NSAIDs can blunt blood-pressure control. |
| Clopidogrel (Plavix), rivaroxaban, warfarin and other blood thinners | Vet-supervised | Adds to the risk of bleeding if an NSAID causes a stomach ulcer. |
| Fluoxetine, clomipramine and other SSRI-type behavior drugs | Vet-supervised | These can slightly raise bleeding risk alongside NSAIDs. Usually manageable, but your vet should know. |
| Phenobarbital, itraconazole, ketoconazole | Vet-supervised | These are processed by the liver and can affect liver values, which makes monitoring for carprofen liver effects more important. |
| Aminoglycoside antibiotics (gentamicin, amikacin), chemotherapy | Vet-supervised | Drugs that can harm the kidneys add to NSAID kidney risk. |
| Gabapentin | Commonly combined | Works on nerve pain by a different route. A very common partner for carprofen in arthritis. |
| Tramadol | Commonly combined | No meaningful interaction with carprofen. Watch for extra drowsiness from the tramadol itself. |
| Amantadine | Commonly combined | Used alongside NSAIDs for chronic pain. |
| Methocarbamol (Robaxin) | Commonly combined | A muscle relaxant often given with carprofen after back or muscle injuries. |
| Apoquel (oclacitinib), Cytopoint | Commonly combined | Allergy medicines with no known interaction. In Apoquel's field studies, dogs also took NSAIDs. |
| Diphenhydramine (Benadryl), cetirizine (Zyrtec) | Generally fine | No known interaction. Check with your vet on the antihistamine dose, and make sure the product has no added decongestant or painkiller. |
| Librela (bedinvetmab) | Vet decision | A monthly antibody injection for arthritis pain. Vets sometimes overlap it with carprofen while Librela starts working, but there is little data on long-term use together. |
| Glucosamine, chondroitin, green-lipped mussel, UC-II collagen | Generally fine | Widely used with carprofen. These may let some dogs manage on a lower NSAID dose over time. |
| Fish oil (omega-3) | Generally fine | Commonly combined. Very high doses have a mild blood-thinning effect, so tell your vet the dose. |
| Turmeric or curcumin, CBD | Tell your vet | Turmeric can irritate the stomach and has mild anti-platelet effects. CBD can raise liver enzymes, which can be confused with a carprofen liver reaction. |
"Vet-supervised" means the combination is used, but with a planned dose and usually blood tests for kidney or liver values. It doesn't mean "avoid".
Why Other NSAIDs and Steroids Are the Big Two
NSAIDs relieve pain by blocking prostaglandins. Prostaglandins also protect the stomach lining and keep blood flowing to the kidneys. Two NSAIDs, or an NSAID plus a steroid, remove that protection far more than one drug alone, and stomach ulcers or perforations can follow within days. This includes aspirin and every human painkiller in the cabinet. Ibuprofen and naproxen are dangerous to dogs even on their own; see carprofen vs ibuprofen.
Switching From Another NSAID, Steroid or Galliprant
Switching between pain medicines usually involves a washout, a gap with no drug, so the first one has cleared before the second starts. There is no single official rule, and your vet's instruction is what to follow. Common practice:
- From another NSAID (meloxicam, deracoxib, firocoxib) to carprofen: often 5 to 7 days after a course of daily doses. Many vets use longer after aspirin.
- After a single injection of a different NSAID (for example ketoprofen or meloxicam at the clinic): vets generally wait at least until the next dose would be due, often 24 hours or more, before starting carprofen tablets. Ask the clinic that gave the injection.
- From a steroid such as prednisone: the gap depends on the steroid, dose and how long it was used, and can be a week or more.
- Between Galliprant and carprofen (either direction): Galliprant leaves the body quickly, and some vets use a short gap of a day or two. Others are more cautious, especially in dogs with a sensitive stomach.
- Rimadyl to a generic (Carprieve, Novox, Vetprofen) or back: no washout. It is the same drug, so just carry on at the same milligram dose on the next scheduled day.
During a washout your dog may be more uncomfortable. Ask your vet whether gabapentin or another non-NSAID can bridge the gap.
Heart, Blood Pressure and Kidney Medicines
A dog on furosemide (Lasix) and Vetmedin for heart disease, or amlodipine for high blood pressure, can still be given carprofen, but the decision is a balance. These dogs' kidneys depend more on prostaglandins to keep their blood supply, so an NSAID is more likely to tip them into kidney stress. Vets usually check kidney values before starting and a couple of weeks after, use the lowest dose that works, and watch for changes in thirst, appetite and weight. If you are asked to give carprofen to a dog on these medicines, it is reasonable to ask your vet when bloodwork will be repeated.
Pain-Relief Partners That Are Commonly Combined
Using medicines that work in different ways ("multimodal" pain relief) often gives better comfort at a lower NSAID dose. Gabapentin, amantadine, tramadol and methocarbamol are all routinely given with carprofen. Any extra drowsiness usually comes from the partner drug, not from carprofen. See carprofen and gabapentin.
Supplements
Joint supplements are the most common thing given alongside carprofen and are generally safe to combine. Two to mention to your vet: high-dose fish oil and turmeric, both for their mild effects on bleeding and the stomach. And avoid willow bark, which is a natural salicylate. If you are choosing a joint supplement, see our guide to joint supplements for dogs.
What to Tell Your Vet
Bring a list, or photos of the labels, of everything your dog takes: prescriptions, flea and worm products, supplements, CBD, and anything you've given "now and then" for pain. Mention any medicine another clinic or an emergency vet gave in the last two weeks, especially injections. That one list prevents most interaction problems. If you notice vomiting, black stool, or a change in drinking after starting a new combination, see our side effects guide and call your vet.
Frequently Asked Questions
Can I give my dog carprofen and prednisone together?
Not without explicit veterinary guidance — combining NSAIDs and corticosteroids significantly raises GI ulceration risk and requires a carefully managed transition if both are needed.
Can carprofen be combined with joint supplements?
Most joint supplements (glucosamine, chondroitin, omega-3s) are commonly used alongside carprofen, but mention all supplements to your vet, especially high-dose fish oil, which can have mild blood-thinning effects.
Can I give my dog carprofen and tramadol together?
Yes, this is a common combination with no meaningful drug interaction. Tramadol can make some dogs drowsy, so that effect comes from the tramadol rather than the carprofen.
Can carprofen be given with Apoquel or Benadryl?
Generally yes. No meaningful interactions are known with Apoquel (oclacitinib), Cytopoint, diphenhydramine (Benadryl) or cetirizine (Zyrtec). Check that any antihistamine product has no added decongestant or painkiller.
Is it OK to give carprofen to a dog taking Lasix and Vetmedin?
Sometimes, but only with your vet's plan. Furosemide (Lasix) and the heart disease behind it make the kidneys more sensitive to NSAIDs, so vets use the lowest effective dose and check kidney values before and after starting.
How long should I wait between meloxicam and carprofen?
There is no single rule, but 5 to 7 days after a course of another NSAID is a common washout. Follow the gap your vet gives you, and never give two NSAIDs on the same day.
Can I give my dog carprofen and gabapentin together?
Yes, this is a common combination — gabapentin works on a different pathway (nerve-related pain) than carprofen's NSAID mechanism, so they're generally considered safe to use together under veterinary guidance, and are often paired for more complete pain control.