Gabapentin and Breathing Changes in Cats

Name: Gabapentin and Breathing Changes in Cats
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-03

Gabapentin can change how a cat breathes, but in most cases the change is mild and expected. The drug often makes cats sleepy and relaxed, and their breathing may look slower or shallower than usual while the medication is working. The tricky part is telling ordinary sedation apart from a breathing problem that needs a veterinarian right away.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

Gabapentin is a sedative, pain, and anxiety medication. Sleepiness and calmer behavior are the expected effects, and breathing can slow slightly along with them [1].
A relaxed cat with a normal pink gum color, steady breathing, and a normal response to touch is usually just sedated.
Call your veterinarian the same day if breathing looks noticeably slow, if your cat is hard to wake, or if you are unsure whether the breathing is normal.
Go to an emergency clinic now if your cat is gasping, breathing with an open mouth, has blue or gray gums, or is struggling to get air.
Never give a second dose or a different sedative to "top up" the effect without talking to your veterinarian first.

What Gabapentin Is and Why Veterinarians Prescribe It

Gabapentin is a human medication that veterinarians also use in cats. It has three main jobs in feline medicine: reducing anxiety, providing sedation, and helping with pain [1]. It is used often because it is generally well tolerated and does not appear to disturb the cardiovascular system in the ways some other sedatives can [1].

You will most often see gabapentin prescribed for a few situations:

Vet visit stress. A cat that panics in the carrier or fights handling can be given gabapentin before an appointment to make the visit safer and less frightening for everyone [1].
Pain support. It is used as part of a pain plan, often alongside other medications, for issues such as joint pain or after surgery.
Hospital or procedure sedation. It is commonly given before anesthesia or other sedating drugs to help a cat settle and to reduce the amount of injectable anesthetic needed [2][3].

If you want the broader picture on what this drug does, see Gabapentin For Cats.

How Gabapentin Works and Why It Can Affect Breathing

Gabapentin calms overactive nerve signals. That is why it helps with both anxiety and certain kinds of pain. The same calming effect on the nervous system is what produces sedation, and sedation is what changes breathing.

When a cat is deeply relaxed or asleep, the normal drive to breathe can ease off a little. Breaths may become slower, and the chest may rise and fall less dramatically. This is the same pattern you would see in a cat napping deeply after a long day. In studies of gabapentin used before sedation and anesthesia, researchers tracked respiratory rate as a standard safety variable, and gabapentin did not cause dangerous cardiovascular changes in the cats studied [1][4].

That said, gabapentin is often not given alone. It is frequently combined with other sedatives or pain medications such as acepromazine, methadone, dexmedetomidine, butorphanol, or midazolam [2][4][5]. When drugs are stacked, the total sedation is deeper, and breathing changes are more likely. This is one reason your veterinarian asks what else your cat is taking.

Dosing Basics: Who Decides and How It Is Given

Your veterinarian decides the dose. There is no single standard gabapentin dose for cats, and the effect appears to be dose dependent, meaning more drug generally means more sedation [1]. Those numbers come from research settings, not from a dosing chart for your cat. Your veterinarian calculates the right amount based on your cat's weight, health, and the reason for the prescription.

A few practical points:

Giving it with food is suggested. Offering gabapentin in wet or dry food can make it easier to give and may help with stomach upset [1].
Timing matters. In research, gabapentin was given anywhere from 90 minutes to 4 hours before a procedure, depending on the study [2][6][3][7]. Your veterinarian will tell you when to give it for your cat's specific appointment.
Missed dose. If you forget a dose, do not double up. Call your veterinarian's office for instructions. For a pre-visit dose, a missed dose may mean the appointment needs to be rescheduled or handled differently.
Do not share. Never give your cat gabapentin prescribed for another pet or a human, and never adjust the amount on your own.

For more on how dosing is approached for stress and pain, see Gabapentin for Cats: Pre-Vet Visit Stress Dosing and Joint Pain Support.

Cat Breathing on Gabapentin: What Is Expected

Most owners notice that their cat is sleepy, a little unsteady, or unusually quiet. Breathing may look slower and more relaxed. Here is how to judge what you are seeing.

Signs that fit normal sedation:

Your cat is drowsy but wakes when you call or touch.
Breathing is slow but steady and effortless.
Gums are pink, not pale, blue, or gray.
Your cat swallows normally and can hold its head up if needed.
The sedation wears off over hours and your cat gradually returns to normal.

Signs that need a call or a visit:

Breathing that looks labored, with the belly pulling in and out.
Breathing that is much faster than normal while the cat is resting.
Open-mouth breathing, which is not normal in cats.
Noisy breathing or a raspy sound.
A cat that will not wake up or does not respond to a firm touch.

One study of hospitalized cats tracked stress behaviors including mouth breathing after gabapentin or placebo, and most gabapentin-treated cats showed fewer stress behaviors overall [7]. That is reassuring for the typical case, but it does not replace your own eyes on your cat. If something looks wrong, treat it as wrong.

Common and Serious Side Effects

Side effect	How common or serious	What to do
Sleepiness and sedation	Common and expected, especially at higher doses [1]	Let your cat rest in a quiet, safe spot. Do not leave a wobbly cat on stairs or high furniture.
Unsteady walking or wobbling	Common with sedation	Block off stairs and keep your cat on the floor or a low bed until it wears off.
Slightly slower breathing	Common with sedation	Watch gum color and effort. If breathing is easy and gums are pink, this is usually fine.
Vomiting or drooling	Possible, especially if given on an empty stomach	Offer food with the next dose if your vet agrees. Call if vomiting repeats.
Agitation or the opposite of calm	Uncommon	Call your veterinarian. Some cats react differently than expected.
Labored, fast, or open-mouth breathing	Serious	Treat as an emergency. Call your vet or an emergency clinic now.
Blue, gray, or very pale gums	Serious	Emergency. Go now.
Cannot be roused	Serious	Emergency. Go now.

For a fuller list of reactions, see What Are the Side Effects of Gabapentin for Cats?.

Who Should Not Take Gabapentin and What Interacts With It

Gabapentin is not right for every cat. Your veterinarian will weigh the risks if your cat has kidney disease, liver problems, or a history of unusual reactions to sedatives. Cats with chronic kidney disease are sometimes sedated for imaging, and one study found that sedation did not significantly change kidney function markers measured during or shortly after the procedure [5]. That is useful information, but it does not mean every cat with kidney disease should take gabapentin. The decision belongs to your veterinarian.

Drug interactions matter a great deal with gabapentin because it is so often combined with other sedatives. In clinical studies, gabapentin has been given alongside acepromazine, methadone, dexmedetomidine, buprenorphine, butorphanol, midazolam, and propofol [2][4][3][5]. Each of those combinations can deepen sedation and change breathing. Tell your veterinarian about everything your cat takes, including:

Other prescription medications
Over-the-counter products
Supplements
Anything given by another clinic or a previous owner

Never mix gabapentin with alcohol-based products, human sleep aids, or leftover sedatives from another pet. If you are unsure whether a product is safe, call before you give it.

Overdose and When to Call for Help

An overdose can cause heavy sedation, severe wobbliness, slow or difficult breathing, and a cat that cannot be woken. If you think your cat got too much gabapentin, or got into a bottle and you are not sure how much was eaten, act right away.

Call your veterinarian or an emergency clinic immediately. You can also contact poison control for guidance:

ASPCA Animal Poison Control Center: (888) 426-4435
Pet Poison Helpline: (855) 764-7661

Have the medication bottle with you so you can tell them the strength and how much may have been taken. Do not wait for symptoms to appear before calling. Do not try to make your cat vomit unless a veterinarian tells you to.

Limitations and When to Contact a Veterinarian

No article can tell you whether your specific cat's breathing is safe. That judgment needs a veterinarian who can examine your cat, listen to its lungs, check gum color, and measure oxygen levels if needed.

Call your veterinarian the same day if:

Breathing looks slower or shallower than you expected and you are not comfortable with it.
Your cat is more sedated than you were told to expect.
Your cat vomits, drools heavily, or refuses food after the dose.
Your cat seems agitated instead of calm.
You gave the wrong amount, even if your cat seems fine.

Go to an emergency clinic now if:

Your cat is breathing with an open mouth.
Breathing is fast, labored, or the belly is working hard to move air.
Gums are blue, gray, or white.
Your cat will not wake up or does not respond to a firm touch.
Your cat collapses, has a seizure, or seems to be struggling for air.

Bring up at a routine visit:

Any breathing change you noticed, even if it passed.
How long the sedation lasted and how deep it was.
Whether the dose felt too strong or too weak for the job.
Any other medications or supplements your cat takes.

If your cat's anxiety is the main reason for the prescription, Gabapentin for Cat Anxiety: How It Works and What to Expect covers that use in more detail.

Frequently Asked Questions

Is it normal for a cat to breathe slower on gabapentin?

Yes, mild slowing of breathing can be a normal part of sedation. A relaxed cat with pink gums and easy, steady breathing is usually fine. If breathing looks labored, very slow, or your cat is hard to wake, call your veterinarian right away.

How long does gabapentin sedation last in cats?

The duration varies with the dose, the cat, and what other medications were given. In research settings, sedation has been measured from about 30 minutes up to several hours after dosing [6][4]. Your veterinarian can give you a realistic window for your cat's specific situation.

Can gabapentin cause breathing problems in cats?

Gabapentin by itself has not been shown to cause dangerous breathing problems in the cats studied, and it did not disrupt cardiovascular measures in a systematic review [1]. Problems are more likely when gabapentin is combined with other sedatives or given at a high dose. Watch for labored breathing, open-mouth breathing, or blue gums and seek help immediately.

What should I do if my cat seems too sedated after gabapentin?

Keep your cat warm, quiet, and on the floor away from stairs, and check that the gums are pink and breathing is easy. Try to rouse your cat gently. If it will not wake, is breathing oddly, or you are worried at all, call your veterinarian or an emergency clinic.

Can I give my cat a smaller dose next time to avoid heavy sedation?

Do not change the dose on your own. Call your veterinarian and describe what happened, including how long the sedation lasted and how deep it was. Your veterinarian can adjust the amount or choose a different medication for the next visit.

References

A Systematic Review of the Sedative, Behavioral, Analgesic and Cardiovascular Effects of Gabapentin in Cats. Veterinary sciences, 2025.
Influence of gabapentin on the degree of sedation, physiological variables and propofol dosage in cats premedicated with acepromazine and methadone: a randomized, prospective, blinded, clinical study. Veterinary research communications, 2024.
Gabapentin and alprazolam pretreatment enhance sedation and reduce propofol requirements but do not improve intravenous catheter placement in cats undergoing elective ovariohysterectomy. Journal of the American Veterinary Medical Association, 2025.
Influence of prior administration of gabapentin and integrative practices on sedation scores, physiological parameters, and propofol requirement in cats sedated with dexmedetomidine. Topics in companion animal medicine, 2026.
Short-term effect of sedation on kidney function markers in cats with chronic kidney disease. American journal of veterinary research, 2026.
Evaluation of the effects of gabapentin on stress and pain in shelter cats undergoing ovariohysterectomy. Journal of the American Veterinary Medical Association, 2026.
EXPRESS: Effect of oral gabapentin administered in-hospital on behavioral stress, compliance, and physiologic stress markers: a randomized, double-blind, placebo-controlled trial. Journal of feline medicine and surgery, 2026.