Very few cats enjoy a trip to the vet. The carrier comes out, the car starts, and a calm housecat turns into a hissing, hiding, sometimes biting patient, no matter how gently the team handles them. That fear is one of the main reasons owners put off veterinary care.
Gabapentin is one of the tools vets use to make those visits easier. A single dose before the trip can take the edge off fear, and in other cats the same drug is given every day for arthritis pain or, alongside other medicines, for seizures. Below we cover what it does, how it is given, the published dose ranges for each use (with sources), who needs a lower dose, and which side effects mean you should call.
What Is Gabapentin and How Is It Used in Cats?
Gabapentin is a human medicine that is structurally related to GABA (gamma-aminobutyric acid), a calming messenger in the nervous system. Despite the resemblance, it does not work through GABA receptors. Its effects on pain and seizures are thought to come from blocking part of certain calcium channels in nerve cells (the alpha-2-delta subunit), which reduces the release of excitatory signals.
Gabapentin is not licensed for animals; only human products exist. Vets prescribe the human capsules or tablets, or a compounded liquid, as an extra-label drug. That is common practice, but it means the dose, timing and form are your vet's call rather than a label's. In cats it has three main uses:
- Fear and anxiety before a vet visit or trip. A single dose given at home before the carrier comes out.
- Chronic pain, especially arthritis in older cats and nerve (neuropathic) pain, often as part of a wider pain plan. The evidence here is thinner: the main feline trial was a two-week pilot in 20 arthritic cats, in which owners saw improvement in the activities their cats had struggled with.
- Seizures, as an add-on. The Merck Veterinary Manual notes that no studies support gabapentin as the only seizure drug in cats; it may help alongside other anticonvulsants.
The pre-visit use is the best studied. In a 2017 trial of 20 cats with a history of stress or fractious behavior at the vet, owners rated their cats as less stressed during transport and the exam, and the vet rated them as more cooperative, when the cats had gabapentin instead of a placebo. A 2018 trial in 53 trapped community cats found lower fear scores, with the biggest drop about 2 hours after the dose. And in a 2021 study of cats with fear-based aggression at the vet, the typical cat on gabapentin completed all 9 steps of a standard exam, while the typical cat on placebo managed less than one.
The 2022 AAFP/ISFM Cat Friendly Veterinary Interaction Guidelines include gabapentin among the medicines a vet can send home for a fearful cat before a visit. They are just as clear that medication works alongside low-stress handling and carrier training, not instead of them. If your cat is hard to handle, our guide to aggressive cats at the vet clinic covers the handling side.
Not every cat responds. Some cats on gabapentin are still too frightened for a full exam, and the vet may need injectable sedation. Your vet may still ask for the home dose in those cats: the AAFP/ISFM guidelines suggest lowering sedative doses when gabapentin was given before the visit.
How Is Gabapentin Given to Cats?
Gabapentin is given by mouth. It comes as capsules, tablets, or a liquid that a compounding pharmacy makes for pets. Many owners open the capsule and mix the powder into a small amount of wet food, or hide the capsule in a soft treat. A 2025 systematic review of feline studies suggests giving it with food; vomiting was one of the reported side effects in the 2017 trial. Ask your vet which form suits your cat if pills are a fight.
Timing before a visit. The 2017 trial gave the dose 90 minutes before the cat went into the carrier, the 2021 trial 2 hours before the visit, and the AAFP/ISFM guidelines advise 2 to 3 hours before the first stressful moment (the carrier, the car or arrival at the clinic). Fear scores were lowest about 2 to 3 hours after the dose. Your vet will tell you exactly when to give it; follow their timing.
After the dose. Expect a sleepy, wobbly cat. The guidelines advise keeping the cat indoors for at least 8 hours afterward and, for some cats, blocking access to high perches and stairs so they can't fall. Don't be surprised if your cat looks drowsier at home than it did at the clinic.
Long-term use. If your cat takes gabapentin every day for pain or seizures, give it on the schedule your vet set. Don't stop it suddenly without talking to your vet: the human drug label warns that abruptly stopping an antiseizure drug can increase seizures. If you miss a dose, ask your vet what to do rather than doubling up.
Storage. Capsules and tablets are kept at room temperature. The human oral solution is stored in the fridge; a compounded liquid should be stored the way the pharmacy label says.
Gabapentin Dosage Chart for Cats
All uses below are extra-label: your vet decides whether gabapentin is right for your cat, and at what dose.
For information only. These are typical published dose ranges, not a prescription and not medically verified for your pet. Your veterinarian sets the dose after examining your pet. Never start, stop or change a medicine without their OK.
Species | Use | Dose (per kg and per lb) | How often | Route | Source |
|---|---|---|---|---|---|
Cat | Fear and anxiety before a vet visit or trip | 20 to 30 mg/kg (9.1 to 13.6 mg/lb), no more than 200 mg per dose; published fixed doses are 100 to 200 mg per cat | Once, 90 minutes to 3 hours before the carrier or car | By mouth | AAFP/ISFM 2022 guidelines (100 to 200 mg per cat or 20 mg/kg); van Haaften 2017; Kruszka 2021; Papich handbook, as cited in Di Cesare 2023 (20 to 30 mg/kg) |
Cat | Chronic pain (arthritis, nerve pain) | 5 to 10 mg/kg (2.3 to 4.5 mg/lb) | Every 12 hours | By mouth | Papich handbook, as cited in Di Cesare 2023; Guedes 2018 (10 mg/kg every 12 hours in arthritic cats) |
Cat | Seizures, as an add-on to other drugs | 5 to 10 mg/kg (2.3 to 4.5 mg/lb); some cats need up to 20 mg/kg (9.1 mg/lb) every 8 to 12 hours | Every 12 hours | By mouth | Papich handbook, as cited in Di Cesare 2023; Merck Veterinary Manual (add-on use only) |
Cat | Kidney disease, small, older or frail cats | Lower than the rows above, set by your vet | Set by your vet | By mouth | AAFP/ISFM 2022; Quimby 2022; Merck Veterinary Manual |
Dose calculator · Gabapentin
Gabapentin dose calculator for cats
Not a prescription. For information only. These are typical published dose ranges, not a prescription and not medically verified for your pet. Your veterinarian sets the dose after examining your pet. Never start, stop or change a medicine without their OK.
Only give what your vet prescribed.
All doses in this calculator
| Pet | Use | Typical dose | How often | Route | Source |
|---|---|---|---|---|---|
| Cat | Fear and anxiety before a vet visit or trip | 20 to 30 mg per kg (9.07 to 13.6 mg per lb), max 200 mg per doseExtra-label: your vet decides. Published fixed doses are 100 to 200 mg per cat (van Haaften 2017 and others); your vet picks the dose. Never give both a fixed dose and a per-kg dose. Lower dose in kidney disease and in small, older or frail cats; your vet sets it. Expect sleepiness and wobbliness; keep your cat indoors for at least 8 hours. | once, 90 minutes to 3 hours before the carrier or car | by mouth | AAFP/ISFM 2022 (100 to 200 mg per cat or 20 mg/kg); van Haaften 2017; Kruszka 2021; Papich handbook as cited in Di Cesare 2023 (20 to 30 mg/kg) |
| Cat | Chronic pain (arthritis, nerve pain) | 5 to 10 mg per kg (2.27 to 4.54 mg per lb)Extra-label: your vet decides. Vets often start low and raise the dose in steps because cats can become very sleepy. Lower dose in kidney disease; your vet sets it. | every 12 hours | by mouth | Papich handbook as cited in Di Cesare 2023; Guedes 2018 (10 mg/kg every 12 hours in arthritic cats) |
| Cat | Seizures, as an add-on to other drugs | 5 to 10 mg per kg (2.27 to 4.54 mg per lb)Extra-label, add-on use only: your vet decides. Some cats need up to 20 mg/kg (9.1 mg/lb) every 8 to 12 hours. Do not stop it suddenly. Lower dose in kidney disease; your vet sets it. | every 12 hours | by mouth | Papich handbook as cited in Di Cesare 2023; Merck Veterinary Manual (add-on use only) |
Only give what your vet prescribed, at the dose they set.
Call now if your cat got more than prescribed, cannot stand or is very hard to wake: call your vet, the ASPCA Animal Poison Control Center at (888) 426-4435, or the Pet Poison Helpline at (855) 764-7661. Side effects and who should not take gabapentin are covered below.
A few things the chart can't show. Most pre-visit trials gave a fixed amount per cat rather than a dose by weight: one 100 mg capsule in the 2017 trial, 100 or 200 mg in the 2021 trial. The per-kg range in the chart is the same dose written by weight, so your vet will prescribe one or the other, never both added together. Researchers have not settled on a single best dose: a 2025 review of 20 feline studies found the effects may depend on dose, but no specific dosage is established. For pain, vets often start low and raise the dose in steps, because cats can become very sedated. Mg/lb figures are converted from the per-kg doses.
Cats With Kidney Disease Need Lower Doses
Gabapentin leaves a cat's body through the kidneys. In a 2022 study, cats with chronic kidney disease were given half the pre-visit dose that healthy cats received, yet their blood levels were higher relative to the dose, and levels rose as kidney values worsened. The authors concluded that cats with kidney disease likely need a reduced dose, and the AAFP/ISFM guidelines suggest a lower dose for these cats and for small, frail or debilitated cats. Sedation can also last longer in older cats and cats with reduced kidney function.
If your cat is a senior, ask whether recent bloodwork is needed before gabapentin is prescribed, and always tell your vet if your cat has been diagnosed with kidney disease. Our guide to kidney disease in cats explains the stages.
Side Effects of Gabapentin in Cats
Gabapentin is generally well tolerated in the published feline studies. The effects owners notice most are an extension of what the drug is meant to do:
- Sleepiness (sedation). The most common effect.
- Wobbliness (ataxia), a drunken, unsteady walk. In the 2017 trial these effects were gone within 8 hours; in the 2021 trial, within 10 hours.
- Drooling and vomiting, reported in some cats.
- Weakness, muscle tremors and lower activity, seen in some arthritic cats on twice-daily doses for two weeks.
- Rarely, the opposite effect: restlessness, agitation or more fear. Call your vet if this happens.
For clinics: in a 2024 study, a single dose lowered Doppler blood pressure readings by a median of about 12 mmHg in healthy cats and in cats with kidney disease, so note gabapentin in the record when you measure blood pressure. Other studies, and the AAFP/ISFM guidelines, describe minimal cardiovascular effects and no interference with cardiac exams.
When to call:
- Mention at your next visit: mild sleepiness or wobbliness that wears off the same day after a pre-visit dose.
- See your vet soon: your cat on long-term gabapentin seems more sedated than usual, is wobbly day after day, eats less, or vomits more than once; or your cat is restless or more fearful instead of calmer.
- Call now: your cat got more than was prescribed, cannot stand or seems collapsed, is very hard to wake, or a dog in the house got into a gabapentin liquid. Call your vet, the ASPCA Animal Poison Control Center at (888) 426-4435, or the Pet Poison Helpline at (855) 764-7661.
Who Should Not Take Gabapentin, and the Xylitol Question
Tell your vet before your cat takes gabapentin if your cat:
- has ever had an allergic reaction to gabapentin (a cat with a known allergy to a drug should not be given it again);
- has kidney disease or is old, small or frail;
- is pregnant or nursing;
- takes any other medicine or supplement.
Liquid gabapentin and xylitol. The human oral solution (Neurontin) lists xylitol as an ingredient. Xylitol is dangerous for dogs: it can cause a sudden drop in blood sugar and liver failure (see xylitol toxicity in dogs). The Merck Veterinary Manual warns that the xylitol in the commercial liquid can be toxic and cause liver failure in dogs and cats. The evidence in cats is limited: one small 2018 study gave xylitol to six cats and found no toxic effects. Either way, if your cat needs a liquid, ask for a compounded liquid made without xylitol, and if you have a dog, keep any human gabapentin liquid well out of reach. Dogs get gabapentin too; our guide to gabapentin for dogs covers them.
Gabapentin Drug Interactions and Monitoring
Tell your vet about everything your cat takes, including vitamins, supplements and herbal products. Other medicines that cause sleepiness, such as opioid pain relievers or other sedatives, can add to gabapentin's sedation, and your vet may adjust doses when they are used together. Gabapentin is often part of a wider pain plan, so the combination is your vet's choice.
Blood levels do not usually need to be checked. Your vet will want to see a cat on long-term gabapentin from time to time to check that the dose still controls pain or seizures without too much sedation, and, in cats with kidney disease, to recheck kidney values.
Summary
Gabapentin earns its place in feline practice. A single dose before a vet visit can turn a frightened, defensive cat into one that can be examined properly, and daily doses may help some cats with arthritic or neuropathic pain and support seizure control, although the evidence for long-term pain use is still limited. It is generally well tolerated; sleepiness and wobbliness are the price, so keep your cat safe for the rest of the day after a dose.
The dose depends on why it is given, your cat's weight and, above all, kidney function. Use the chart and the calculator to understand what your vet prescribed, not to choose a dose yourself, and call if your cat gets more than prescribed or cannot stand.
Originally written by Dr. Catharina Hjorth. Updated by the I Love Veterinary editorial team.
Sources
- 2022 AAFP/ISFM Cat Friendly Veterinary Interaction Guidelines: Approach and Handling Techniques (J Feline Med Surg)
- Merck Veterinary Manual: Anticonvulsants for Treatment of Animals (gabapentin)
- Di Cesare F et al. (2023): Gabapentin: Clinical Use and Pharmacokinetics in Dogs, Cats, and Horses (Animals; doses from Papich, Handbook of Veterinary Drugs, 5th ed.)
- van Haaften KA et al. (2017): Effects of a single preappointment dose of gabapentin on signs of stress in cats (JAVMA)
- Pankratz KE et al. (2018): Single-dose oral gabapentin in cage-trap confined community cats (J Feline Med Surg)
- Kruszka M et al. (2021): A single oral dose of gabapentin and fear-based aggressive behaviors in cats (JAVMA)
- Guedes AGP et al. (2018): Gabapentin in osteoarthritic geriatric cats (JAVMA)
- Quimby JM et al. (2022): Serum concentrations of gabapentin in cats with chronic kidney disease (J Feline Med Surg)
- Quimby JM et al. (2024): Effect of gabapentin on blood pressure in cats with and without chronic kidney disease (J Feline Med Surg)
- Tuleski GLR et al. (2022): Behavioral and cardiovascular effects of a single dose of gabapentin or melatonin in cats
- Laguardia MV et al. (2025): A systematic review of the effects of gabapentin in cats (Veterinary Sciences)
- Jerzsele Á et al. (2018): Effects of orally administered xylitol in cats (J Vet Pharmacol Ther)
- U.S. National Library of Medicine, DailyMed: Neurontin (gabapentin) prescribing information
- Cat Specialist Services: Using gabapentin or pregabalin to sedate your cat for travel
- Fairhaven Veterinary: Gabapentin for Cats (client handout)
This article is for general information and is not a substitute for advice from your veterinarian.
