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If your dog has become wobbly, weak in the back end, is dragging a foot, has had a seizure, or has started leaking urine or drinking far more than usual in the weeks after a Librela injection, call your vet today and do not give the next dose until they have examined the dog. Those are the signs the FDA wrote to veterinarians about in December 2024. Ask the practice to report it to Zoetis (1-888-963-8471) or directly to the FDA, with the lot number and the number of doses given. Reporting is how the safety picture gets clearer for every other dog.
The short answer: Librela (bedinvetmab) is a monthly injection that blocks nerve growth factor, one of the main chemical signals of osteoarthritis pain. It works for a lot of dogs, and it has real advantages over daily NSAIDs. It is also a newer drug with a thinner long-term safety record than the drugs it is replacing, and the two licensing trials disagree about how much it helps: in the European study it beat placebo by 27 points at one month; in the US study, by 11. In 2024 the FDA told vets about reports of wobbliness, seizures, weakness, incontinence, and in some cases death, and in 2025 the label was changed to require an owner information sheet before the first dose. This page sets out what the trials actually showed, the side-effect picture from trials and from the field, the cost, how it compares to Adequan and to NSAIDs, the questions to ask before the first shot, and where a hemp supplement sits alongside it.
Written by Marc Brannigan, Co-Founder & CEO of HempMy Pet. Last updated 15 October 2026.
What Librela Is, and How It Is Different
It is not a painkiller in the way carprofen or gabapentin are. It is an antibody.
Bedinvetmab is a fully canine monoclonal antibody that binds nerve growth factor (NGF). In an arthritic joint, NGF levels rise and amplify the pain signal; take the NGF out of circulation and the signal drops. It is given under the skin once a month at 0.5 to 1 mg/kg, by a vet, from vials sized to the dog's weight. It was approved in Europe in 2020 and in the US in May 2023, and Zoetis reports more than 25 million doses given worldwide.
Because it is an antibody rather than a small-molecule drug, it is not processed by the liver or kidneys the way NSAIDs are, which is the main reason it appeals for older dogs whose bloodwork is borderline. The flip side is that it is not cleared quickly either: the measured half-life is about 19 days, so a single dose is still partly active two months later and takes roughly three months to clear. If something goes wrong, you cannot stop it the way you can stop a pill.
Context worth knowing: anti-NGF antibodies were developed for human arthritis first (tanezumab, fasinumab) and never reached the market, in part because a minority of patients developed rapidly worsening joint damage. Dogs are not people and the canine data do not show the same thing so far, but it is the reason some vets watch the joints of dogs on Librela more closely than the label requires.
What the Two Licensing Trials Actually Showed
Both were randomised, double-blind and placebo-controlled, which is the right design. They did not get the same answer.
| European study (2021) | US study (2023) | |
|---|---|---|
| Dogs | 287 client-owned dogs with OA | 272 client-owned dogs with OA |
|
Treatment success at day 28 owner pain inventory: severity down ≥1, interference down ≥2 |
43.5% on Librela vs 16.9% on placebo | 47.4% on Librela vs 36.6% on placebo |
| Margin over placebo | About 27 percentage points | About 11 percentage points |
|
Number needed to treat how many dogs get the drug for one to benefit beyond placebo |
Roughly 4 at one month | 9.3 at one month, improving to 4.3 at three months with continued monthly dosing |
| Still working at day 84? | Yes: 48.2% success, placebo under 25% throughout | Yes, and the gap widened as placebo response faded from day 84 |
| Adverse events in trial | Similar in both groups, judged typical of arthritic dogs | Similar in both groups, not considered treatment-related |
Two honest readings. First, it works: in both studies more dogs improved on the drug than on saline, the effect held for three months, and the European study saw improvement from day 7. Second, the placebo response in arthritic dogs is enormous: in the US study more than a third of dogs "improved" on salt water, which is what you would expect when owners are rating pain in a disease that waxes and wanes. The US figure of one dog in nine benefiting beyond placebo at a month is the number nobody puts in the brochure, and it is the reason the right plan is a two-dose trial with a decision at day 60, not an open-ended monthly commitment.
Sources: Corral et al., Veterinary Anaesthesia and Analgesia 2021; Michels et al., Veterinary Anaesthesia and Analgesia 2023. A 2026 non-inferiority trial using force-plate gait analysis found Librela at least as effective as daily grapiprant (Galliprant) over six weeks: 68.8% vs 56.3% success.
Librela Side Effects: The Trial List and the Field List
These are two different lists, and most pages only print the first one.
On the label from the trials
The most common adverse reactions in the licensing studies were urinary tract infection, bacterial skin infection, dermatitis, pain at the injection site and inappropriate urination, at rates close to the placebo group. Raised BUN (a kidney value), vomiting, reduced appetite, lethargy, weight loss and diarrhoea are listed. Anaphylaxis is possible with any injected antibody. The label states that use for longer than nine months has not been evaluated, that it has not been studied in dogs under 12 months, and that it should not be given to pregnant, breeding or lactating dogs.
What came in after approval
On 16 December 2024 the FDA published a Dear Veterinarian letter about adverse events reported in dogs treated with Librela: ataxia (wobbliness), seizures, other neurological signs including paresis (weakness), recumbency (unable to get up) and urinary incontinence, polyuria and polydipsia (drinking and urinating far more). In the FDA's words, "in some cases, death (including euthanasia) was reported as an outcome of these adverse events." The letter did not say Librela caused them; adverse-event reports are associations, and the dogs receiving this drug are old and arthritic. It did ask vets to report every case with the dose count and lot number, and it noted the agency could not mandate a label change.
Zoetis changed the label voluntarily in February 2025: a new post-approval section listing those events, and a requirement that vets give owners a Client Information Sheet and discuss the risks before the first injection. If your vet did not hand you that sheet, ask for it. The European regulator's 2024 review classed the neurological events as rare, under 10 per 10,000 dogs treated.
A 2026 critical appraisal of the published safety evidence found the trials supported safety for courses under three months, that one pharmacovigilance analysis found musculoskeletal problems reported more often with Librela than with older arthritis drugs, and that the long-term picture is simply not well studied yet. That is the fair summary: a short course looks safe in the data we have; the drug is usually given for years.
Rare does not mean never, and a drug that stays in the body for three months is one you want to be sure about before the second dose, not after the sixth.
How Long Do Librela Side Effects Last?
This is the question owners ask after the fact, and the pharmacology answers it. With a 19-day half-life, roughly half the dose is gone at three weeks, three-quarters at six, and most of it by about three months. Mild signs such as lethargy or a sore injection site usually settle within days. Neurological signs reported to the FDA had variable courses; some dogs recovered as the drug cleared and some did not, which is why the right response to any new wobbliness or weakness is a same-week vet exam and a hold on the next injection, not waiting to see.
Why Are Vets Pushing Librela?
A fair question with several honest answers, not all of them about your dog.
- It solves real problems. No daily pill to hide in cheese, no NSAID-related stomach, kidney or liver monitoring, and an option for dogs who cannot take NSAIDs at all. For a 14-year-old Labrador with borderline kidneys, that is a meaningful advantage.
- Owners like it. A monthly visit is easier to comply with than twice-daily tablets, and the improvement in a responder is obvious.
- It is new, and heavily promoted. Zoetis is the largest animal-health company in the world and Librela is one of its flagship launches. Practices receive training, materials and incentives for new drugs in a way they do not for carprofen.
- It is profitable. A monthly injection with an exam fee is recurring revenue. That does not make it wrong for your dog, but it is worth knowing when you weigh a recommendation.
Is Librela Safe for Senior Dogs?
The trial populations were mostly older dogs, so age itself is not a contraindication, and the absence of NSAID-type organ load is the main reason it is chosen for seniors. The cautions that matter in an old dog are: heart disease (the label advises care), any existing neurological or back problem (because new wobbliness will be impossible to attribute), kidney values (BUN can rise), and a dog who is already unsteady on their feet. The most useful thing you can do before the first dose is film your dog walking, thirty seconds from behind and thirty from the side, so that "is he more wobbly than before?" has an answer a month later.
What Librela Costs
In the US, owners report roughly $75 to $300 per injection depending on the dog's weight (larger vial, higher price) and the practice, plus an exam fee at most clinics. For a medium dog that is typically $1,000 to $2,000 a year. It is not available without a vet, and online pharmacy listings still require the injection to be given at a practice in most states. If cost is the barrier, ask about a two-dose trial before committing to a year.
Librela vs Adequan
They are not alternatives to each other so much as different jobs, and they are often used together.
| Librela (bedinvetmab) | Adequan (polysulfated glycosaminoglycan) | |
|---|---|---|
| What it does | Blocks the pain signal (NGF). Does nothing to the joint itself. | Injected into muscle; labelled to support cartilage and joint fluid. Aims at the joint, not the pain signal. |
| Schedule | Once a month, indefinitely | A loading series (twice weekly for four weeks), then maintenance as the vet decides |
| Evidence | Two placebo-controlled trials, clear pain-score benefit; long-term safety thin | Older, smaller studies; modest, slower benefit; decades of safety data |
| Speed | Days to a few weeks | Weeks |
| Rough cost | $75–$300 per month | $30–$80 per injection; more up front, less long term |
| Best fit | Moderate to severe pain, NSAID-intolerant dogs, owners who struggle with daily pills | Early to moderate OA, dogs you want to keep on a lower drug load, alongside other therapy |
On the NSAID question: Librela is not a reason to stop a well-tolerated NSAID, and many dogs have both. It is a reason to review whether the NSAID is still needed once the injection is clearly working, which is a dose-by-dose vet conversation. We cover what each of the common ones does in what you can give a dog for pain.
Eight Questions to Ask Before the First Injection
- Can I have the Client Information Sheet? It has been required since February 2025. If the practice does not have it, that tells you something.
- What is our stopping rule? Agree in advance: two doses, then a decision at day 60 using a pain score, not a feeling.
- Can we do bloodwork and a neurological check first? Baseline kidney values and a note of how steady the dog is on their feet.
- Are we changing anything else at the same time? One change at a time, or you will not know what worked or what went wrong.
- What should I watch for, and what do I do if I see it? Wobbliness, back-end weakness, incontinence, big increase in drinking, any seizure. Call before the next dose.
- Does my dog's heart, kidney or back history change the picture?
- What does a year cost, honestly? Including the exam fees.
- Will you report it if something happens? The FDA has asked for lot numbers and dose counts; the reports are how the picture improves.
Where Hemp Fits Alongside Librela
We make hemp products, so read this with that in mind.
A dog on Librela is a dog with diagnosed osteoarthritis, and that is the one use where the canine evidence for hemp is real rather than hopeful: five published controlled trials, four positive, one of them ours. In our 90-day study of 37 dogs, 30 of the 32 that completed it showed a benefit and 94% of owners reported better quality of life. It is a daily supplement judged over weeks, not a monthly injection, and it does not replace one.
On interactions, the honest position is that there is no published study of CBD given with bedinvetmab. The reassuring part is mechanistic: the drug-interaction concern with CBD is about liver enzymes, and an antibody is not processed by those enzymes, so the usual CBD-and-medications worry does not apply in the same way. The cautious part is that nobody has looked. Tell your vet what you are giving, and if you are doing a two-dose Librela trial, do not start hemp in the same month, or you will not know which one did what. The broader interaction picture is in CBD and your dog's medications, and what to expect from hemp for joint comfort is on our joint and mobility page.
For daily joint comfort alongside whatever your vet prescribes
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1,000mg Hemp Seed Oil
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Large Dog Hemp Treats
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Grown on our own Colorado farm, third-party tested every batch, and the same full-spectrum extract used in our 90-day university trial. Serving by weight →
Frequently Asked Questions
Is Librela safe for senior dogs?
Age is not a contraindication and the licensing trials were mostly older dogs; the lack of liver and kidney load is the main reason it is chosen for seniors. The cautions are heart disease, existing neurological or spinal problems, raised kidney values, and a dog who is already unsteady. Film your dog walking before the first dose so that any change in steadiness can be judged against something.
What are the downsides of using Librela?
It stays in the body for about three months, so it cannot be stopped quickly; long-term safety beyond nine months has not been evaluated; the US trial showed a modest margin over placebo at one month (47% vs 37%); the FDA has received reports of wobbliness, seizures, weakness, incontinence and death; and it costs $75 to $300 a month indefinitely. It also does nothing for the joint itself; it blocks the pain signal.
Why are vets pushing Librela?
Partly because it solves real problems: no daily pill, no NSAID organ monitoring, and an option for dogs who cannot take NSAIDs. Partly because it is new, heavily promoted by the largest animal-health company in the world, and a monthly injection is recurring revenue for a practice. None of that makes it wrong for your dog; it is context for weighing the recommendation.
How long does it take for Librela side effects to go away?
The half-life is about 19 days, so half the dose is gone in three weeks and most of it in about three months. Mild effects such as lethargy or a sore injection site usually pass within days. Neurological signs reported to the FDA had variable outcomes; some dogs recovered as the drug cleared and some did not, which is why any new wobbliness or weakness means a vet exam before the next dose.
What is Librela used for in dogs?
Control of pain from osteoarthritis in dogs over 12 months old. It is not licensed for injuries, post-surgical pain, or any other kind of pain, and it is not for pregnant, breeding or lactating dogs.
How long does Librela take to work?
Some dogs improve within 7 days of the first injection; the European trial showed a significant difference from placebo at day 7. Most dogs need two doses before the effect is clear, and the US trial's benefit over placebo was much larger at day 84 than at day 28. A fair trial is two doses with a decision at day 60.
Can Librela be given with NSAIDs or gabapentin?
Yes; the trials allowed concurrent medication and many dogs are on both. It is not a reason to stop a well-tolerated NSAID, but once the injection is clearly working it is a reason to ask whether the NSAID is still needed. Change one thing at a time so you can tell what is doing what.
Librela vs Adequan: which is better?
Different jobs. Librela blocks the pain signal, works within weeks, and has the stronger trial evidence for pain relief. Adequan is injected into muscle to support the joint itself, works more slowly, has decades of safety data, and is often used alongside Librela or an NSAID rather than instead of one. For severe pain, Librela; for early disease or a dog you want on the lowest drug load, Adequan is the more conservative start.
Has Librela caused deaths in dogs?
The FDA's December 2024 letter said that in some reported cases death, including euthanasia, was the outcome of the neurological adverse events. The reports are associations, not proof of cause, in a population of old arthritic dogs, and the European regulator classed the events as rare at under 10 per 10,000 dogs. It is enough reason to know the warning signs, to hold the next dose if you see them, and to make sure your vet reports anything that happens.
The Short Version
Librela works for a meaningful share of arthritic dogs and spares the organs that NSAIDs tax. It also stays in the body for three months, has a thinner long-term safety record than the drugs it replaces, showed a smaller margin over placebo in the US trial than the marketing suggests, and has a 2024 FDA warning and a 2025 label change behind it. Treat it as a two-dose trial with a stopping rule, film your dog walking before the first shot, get the Client Information Sheet, and report anything that happens.
Hemp sits alongside it as a daily joint-comfort supplement, not as a replacement, and not started in the same month.
Hemp for Hip & Joint Mobility → All Hemp for Dogs
Arthritis in Dogs · What Can I Give My Dog for Pain? · Carprofen Side Effects · Gabapentin Side Effects · CBD and Medications · Serving by Weight
Marc co-founded HempMy Pet in 2016 with his business partner Natalie Mondine, the company's COO. HempMy Pet breeds its own hemp genetics, grows them on its certified-organic Colorado farm, and formulates every batch in-house under human-grade standards — seed to sale, nothing sourced overseas. Every batch is third-party tested and the certificates of analysis are published. More about us.
HempMy Pet ran its own 90-day study of 37 dogs with chronic joint discomfort. Of the 32 that completed it, 30 (93%) showed a benefit, and 94% of owners reported their dog's quality of life had improved. It was overseen by Dr. Robin Downing, DVM, MS of the Downing Center for Animal Pain Management, with Lori Kogan, Ph.D. and Peter W. Hellyer, DVM of Colorado State University's College of Veterinary Medicine & Biomedical Sciences, and published in the Journal of the American Holistic Veterinary Medical Association. Read the methodology.
Why Dr. Downing: in 2005 she became only the third veterinarian in the world credentialed as a Diplomate of the American Academy of Pain Management. She founded the International Veterinary Academy of Pain Management, is a Diplomate of the ACVSMR, a Certified Veterinary Pain Practitioner and a Certified Canine Rehabilitation Practitioner, and was the AVMA's 2020 Bustad Companion Animal Veterinarian of the Year. Chronic joint pain is her life's work. Read the published paper (PDF).
This article is general information for dog owners, not veterinary advice. Trial figures are taken from the published licensing studies and the FDA's December 2024 letter; it is reviewed and updated as new peer-reviewed evidence is published, and where the evidence is thin or negative we say so.
These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. This article is general information, not veterinary advice. If your dog is unwell, contact your veterinarian.
