Gabapentin vs Fluoxetine (Prozac) for Cats: Bonqat, State Laws
Quick answer
Gabapentin and fluoxetine are not competitors: they solve different problems. Gabapentin is a fast, as-needed drug, given 90 minutes to 2 hours before a vet visit or trip; several trials (2017-2026) show less stress and easier handling, at the cost of sleepiness and wobbliness for a few hours. Fluoxetine (Prozac) is a daily SSRI for ongoing anxiety or urine spraying; it takes 3 to 4 weeks to start working and up to 6 weeks for full effect. Bonqat (pregabalin) is the only FDA-approved cat anxiety drug (17 November 2023), for transport and vet visits, given about 1.5 hours before. Gabapentin is not federally controlled but is Schedule V in several states, including Montana since 1 October 2025; pregabalin is federal Schedule V. Cats with kidney disease need lower gabapentin doses. Vets can combine a daily SSRI with a pre-visit drug. Your veterinarian sets every dose.
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Gabapentin vs fluoxetine vs Bonqat: side by side
| Gabapentin | Fluoxetine (Prozac) | Bonqat (pregabalin) | |
|---|---|---|---|
| Drug class | Gabapentinoid | SSRI antidepressant | Gabapentinoid, closely related to gabapentin |
| FDA status in cats | Extra-label (human drug) | Extra-label; the vet product Reconcile is approved for dogs only | Approved for cats, 17 November 2023 |
| Federal control | None | None | Schedule V |
| How it's used | Once, before a stressful event | Every day, long term | Once before transport or a visit; up to two consecutive days |
| Onset | Given 90 min-2 h before; peak at 2-3 h | 3-4 weeks; full effect up to 6 weeks | Given about 1.5 h before |
| Published doses (vet sets the dose) | Trials used 50, 100 or 200 mg per cat | 0.5-1.5 mg/kg once daily; trials used 1 mg/kg | Label: 5 mg/kg (0.1 mL/kg) |
| Main side effects | Sleepiness, wobbliness, vomiting | Low appetite, sleepiness, GI upset, irritability | Wobbliness 4.6%, lethargy 2.8%, vomiting 1.9% |
| Kidney disease | Cleared by the kidneys: dose reduction needed | Effects may last longer | Use with caution |
| Evidence | Several randomized trials, 2017-2026 | Two trials in cats that spray urine | Field studies of 209 to 238 cats |
| Cost | Ask your clinic or pharmacy for a written quote | ||
The question "gabapentin vs Prozac" usually hides two different needs. If your cat panics in the carrier or at the clinic, you need something for that moment: gabapentin or Bonqat. If your cat is anxious every day, hides constantly, sprays or over-grooms, you need a daily treatment plan, where fluoxetine may fit. Many fearful cats need both, along with changes at home.
Gabapentin: the pre-visit drug
Gabapentin is a human medicine approved for postherpetic neuralgia and as an add-on for partial seizures. Veterinarians may prescribe it extra-label for cats under federal law (AMDUCA), within a valid veterinarian-client-patient relationship. It binds a subunit of nerve calcium channels; despite its name, it does not act on GABA receptors.
| Study | Cats | What it found |
|---|---|---|
| van Haaften et al. 2017 | 20, crossover; 100 mg 90 min before transport | Lower stress scores, better compliance; vomiting in 2 cats, ataxia in 6 of 15 owner reports; all effects gone within 8 hours |
| Pankratz et al. 2018 | 53 trapped community cats; 50 or 100 mg | Less fear, greatest at 2 hours |
| Kruszka et al. 2021 | 55 cats, including 26 fear-aggressive; 100 or 200 mg 2 h before | Better compliance; drowsiness and ataxia resolved within 10 hours |
| Canosa and Summers 2026 | 30 cats in hospital; 100 mg | Fewer stress behaviors (86% vs 20%), better exam compliance (73% vs 26%), no difference during blood draw; effect called "modest" |
- Timing: give it as directed, usually 90 minutes to 2 hours before leaving; Merck puts peak effect at 2 to 3 hours.
- Do a test run: many vets suggest trying the dose at home on a calm day, so you know how your cat reacts.
- Neurological exams: gabapentin changed exam findings in two studies (2023, 2024). Tell your vet if your cat is being checked for a nerve or spine problem.
- Kidney disease: in a 2022 study, cats with chronic kidney disease given 10 mg/kg reached higher blood levels than healthy cats given 20 mg/kg; the authors concluded there is a "need to dose-reduce".
- Epilepsy: VCA advises not to stop gabapentin abruptly in pets with seizures.
If your cat vomits or drools in the carrier, the issue may be motion sickness as well as fear: see cat vomiting in the carrier.
Leaving the carrier out at home as a resting place makes travel days easier, with or without medication.
Bonqat: the FDA-approved option
The FDA approved Bonqat on 17 November 2023 "for the alleviation of acute anxiety and fear associated with transportation and veterinary visits in cats", calling it "the first FDA-approved animal drug containing pregabalin". It is a 50 mg/mL oral solution sold in the US by Zoetis.
| Point | Label information |
|---|---|
| Dose (your vet sets it) | 5 mg/kg (0.1 mL/kg) by mouth about 1.5 hours before transport or the visit; can be given on two consecutive days |
| Owner-rated transport response "excellent/good" | 54.3% vs 27.1% on placebo |
| Vet-rated exam response "excellent/good" | 52% vs 30% on placebo |
| Side effects vs placebo | Ataxia 4.6%, lethargy 2.8%, vomiting 1.9% (none on placebo) |
| If drowsy | Keep the cat warm; no food or water until the effects pass |
| Precautions | Kidney disease, heart disease or high blood pressure; not evaluated under 7 months, in breeding cats, or with opioids or other sedatives |
| Large cats | Over 22 lb, the label says to give the total in two separate doses |
| Legal status | Pregabalin is federal Schedule V |
A published trial of 209 cats (Lamminen et al. 2023) found significantly less travel and vet-visit anxiety versus placebo, with only a few cats showing transient, slight incoordination or tiredness; owners found the liquid easy to give. Is Bonqat better than gabapentin? No head-to-head trial was found. Bonqat offers an approved product with a fixed dose; gabapentin has more independent studies and may be cheaper.
Fluoxetine (Prozac): the daily drug
Fluoxetine is an SSRI. Its only FDA veterinary approval is for canine separation anxiety; in cats it is extra-label. Its evidence in cats comes mainly from urine spraying.
- Pryor 2001: in 17 neutered males over 8 weeks, spraying fell from 8.6 times a week to 1.7 by week 2 and 0.4 by weeks 7 and 8; on placebo it stayed around 5.5. Four of 9 treated cats ate less.
- Hart 2005: in 22 cats over 16 weeks, fluoxetine (1 mg/kg daily) and clomipramine worked equally well; improvement continued past 8 weeks; marking returned in most cats after an abrupt stop, and a second course worked about as well.
- Onset: Merck says it "may take 3 to 4 weeks"; a board-certified behaviorist's handout says full effect may take up to 6 weeks.
- Published dose range (your vet sets the dose): 0.5 to 1.5 mg/kg once daily; trials used 1 mg/kg.
- Side effects: reduced appetite and sleepiness are most common; less often GI upset, more anxiety, irritability or litter-box changes; seizures have been reported.
- Long half-life: about 47 hours for fluoxetine and 55 hours for its active metabolite in cats, so changes take time to show; never stop abruptly, taper as directed.
- Transdermal gels: reached only about 10 percent of the oral level in a 2003 study, so they are a poor substitute.
Spraying, door scratching or constant hiding can also signal pain, urinary disease or stress at home: see cat scratching the door and cat sleeping in the litter box.
Using gabapentin and fluoxetine together
| Combination | What is known | Concern |
|---|---|---|
| Daily fluoxetine + gabapentin before visits | No feline trial found; gabapentin is not on the Prozac label's serotonin list; no metabolic interaction expected (human data) | Extra sleepiness, low appetite |
| Fluoxetine + Bonqat | Use with other sedatives "not evaluated" on the label | Same; your vet decides |
| Fluoxetine + trazodone | Both serotonergic | Use with caution |
| Fluoxetine + tramadol, tricyclics or buspirone | On the Prozac label's serotonin-syndrome list | Avoid unless closely supervised |
| Fluoxetine + amitraz collar or other MAOIs | Contraindicated | Never combine |
| Gabapentin + opioids | Breathing-depression warning on the human label | Vet supervision |
Vets commonly pair a daily SSRI with a pre-visit drug, and a behaviorist's handout notes that "there are no studies on combinations". In practice, the watch-points are extra sleepiness, wobbliness and reduced appetite on visit days. Tell your vet about every product your cat receives, including flea and tick collars.
What to expect, hour by hour and week by week
| Time | Gabapentin (pre-visit) | Bonqat | Fluoxetine (daily) |
|---|---|---|---|
| Before the event | Given 90 min-2 h before | Given about 1.5 h before | – |
| First hours | Peak at 2-3 h; mild sedation up to about 6 h | Possible wobbliness or lethargy | – |
| Same day | Effects gone within 8-10 h in trials | If drowsy, keep warm; no food or water until it wears off | – |
| Next day | Only if prescribed | A second consecutive day is allowed | – |
| Weeks 1-4 | – | – | Spraying already down by week 2 in one trial; usual onset 3-4 weeks |
| Weeks 4-8 | – | – | Full effect up to 6 weeks |
| Beyond 8 weeks | – | – | Still improving over 16 weeks in one study |
| Stopping | Don't stop abruptly in cats with seizures | Single-event use | Relapse common after an abrupt stop; taper as directed |
Constant hiding is a reason to talk to your vet: daily anxiety needs a daily plan, not only a pre-visit pill.
Gabapentin state laws in 2026
The DEA's April 2026 drug sheet states: "Gabapentin is not controlled under the Controlled Substances Act." Pregabalin, the drug in Bonqat, is federal Schedule V. States can go further:
| Jurisdiction | Gabapentin status | Since | Source |
|---|---|---|---|
| Federal | Not controlled | – | DEA (primary) |
| Montana | Schedule V; reported to the state prescription registry; prescriptions valid 6 months, max 5 refills; ID checked at pickup | 1 October 2025 | Montana Board of Pharmacy (primary) |
| North Dakota | Schedule V | – | State code (primary) |
| Virginia | Schedule V | – | State code (primary) |
| Utah | Schedule V; a 2025 bill proposed a veterinary exemption; check whether it passed | 1 May 2024 | Bill summaries |
| Alabama, Kentucky, Tennessee, West Virginia | Schedule V | Dates vary by source | Secondary sources |
| Michigan | De-scheduled; no longer reported | Late May 2024 | Secondary sources |
| North Carolina | Not controlled, but veterinary dispensing reported to the state system | 1 March 2025 | NC DHHS (primary) |
What this means for you: in a scheduling state, expect stricter refill rules, ID at pickup, and sometimes a DEA-registered prescriber. Rules change; check with your state board of pharmacy. Telemedicine prescribing of controlled drugs has its own limits: see cat telemedicine in 2026.
Xylitol, liquids and compounding
- Human gabapentin oral solution is 250 mg per 5 mL (50 mg/mL) and contains xylitol.
- For cats, xylitol is not the main danger: Merck states that dogs are the only domestic species in which xylitol toxicosis has been reported and that "cats are not at risk for hypoglycemia or liver injury"; a 2018 study gave 6 cats very high doses without toxicity.
- The real risks are the concentration, which makes small-dose mistakes easy, and dogs in the household, for whom xylitol can be deadly: see xylitol and dogs.
- Never substitute a human product or adjust a dose yourself; use what your vet prescribes.
- Compounded liquids or treats can make dosing easier; compounding must follow FDA rules for animal drugs, and transdermal versions of fluoxetine absorb poorly.
Other options: trazodone, clomipramine, Feliway
Trazodone
50 mg per cat reduced transport anxiety in a 10-cat study (2016); sleepiness was the main side effect. It is serotonergic, so caution with fluoxetine.
Clomipramine
As effective as fluoxetine for urine marking in a 2005 trial.
Buspirone, amitriptyline
Used for spraying and marking; buspirone takes 1 to 4 weeks.
Paroxetine
Anticholinergic effects make it a concern in cats with urinary signs.
Feliway and pheromones
Evidence is weak: a 2010 review called it insufficient, and a 2011 meta-analysis found no significant effect on stopping spraying. Low-risk as an add-on.
Oral diazepam
Fatal liver damage has been reported in cats; it is not a home anxiety option.
Medication works best alongside changes: a carrier left out as a bed, short car rides with treats, a quiet waiting room or "cat-friendly" clinic, and enough hiding and climbing spaces at home. Pain also drives anxiety; arthritis is common in older cats: see Solensia for cat arthritis.
Vet-visit day: a plan that makes any medication work better
- Weeks before: leave the carrier open in a favorite room with a soft blanket and treats, so it becomes a place to rest, not a trap.
- Practice short trips: a few minutes in the car, then home and a reward.
- Do a medication trial at home on a calm day if your vet suggests it, and note how sleepy or wobbly your cat gets.
- On the day: give the dose exactly as prescribed and on time, usually 90 minutes to 2 hours before leaving; ask whether food should be withheld.
- Cover the carrier with a towel in the car and the waiting room, and keep it level and off the floor.
- Ask for a quiet room or to wait in the car until the vet is ready; some clinics offer cat-only hours.
- After the visit: a quiet room, water and food once your cat is steady, and space from other pets until the sedation wears off; returning cats can smell unfamiliar to housemates.
- Write it down: what you gave, when, and how your cat reacted, so the plan can be adjusted next time.
Questions to ask your veterinarian
- Is this for a single event or an ongoing problem? The answer decides between a pre-visit drug and a daily one.
- Should we do a trial dose at home first?
- Do my cat's kidneys, heart or blood pressure change the choice or the dose?
- Is gabapentin controlled in my state, and what does that mean for refills?
- Which formulation (capsule, liquid, compounded) is easiest for my cat?
- Can these drugs be combined with my cat's other medicines or flea products?
- How will we know it's working, and when do we review the plan?
Frequently asked questions
Is gabapentin FDA-approved for cats?
No; it's a human drug vets prescribe extra-label.
What is Bonqat?
A pregabalin oral solution, FDA-approved in November 2023 for cat transport and vet-visit fear.
How is Bonqat given?
Label dose 5 mg/kg by mouth about 1.5 hours before; your vet sets the dose.
Is Bonqat better than gabapentin?
No head-to-head trial exists; it depends on your cat and your state.
How long does fluoxetine take?
Usually 3 to 4 weeks, full effect up to 6.
Can they be combined?
Vets do combine them; watch for extra sleepiness and low appetite.
Gabapentin side effects?
Sleepiness, wobbliness, vomiting; gone within 8-10 hours in trials.
Fluoxetine side effects?
Mainly reduced appetite and sleepiness; never stop abruptly.
Is gabapentin controlled?
Not federally; Schedule V in several states, including Montana since 2025.
Is xylitol in human liquid a risk for cats?
Merck says cats are not at risk, but dogs are; don't substitute human liquids.
Does kidney disease matter?
Yes, cats with kidney disease need lower gabapentin doses.
Does Feliway work?
Evidence is weak; use it as an add-on only.
Sources, accessed 27 October 2026
- FDA: Bonqat approval (17 November 2023) and label (NADA 141-580); AMDUCA guidance. EMA: Bonqat EPAR. DEA: gabapentin drug sheet (April 2026) and controlled substances list. DailyMed: Neurontin (revised 4/2025) and Prozac labels.
- Trials and reviews: van Haaften KA et al., JAVMA 2017; Buckley LA, Veterinary Evidence 2019; Pankratz KE et al., JFMS 2018; Kruszka M et al., JAVMA 2021; de Azevedo AF et al., JFMS 2023; DuPont A et al., JVIM 2024; Canosa C, Summers SC, JFMS (online 28 August 2026); Quimby JM et al., JFMS 2022; Laguardia MV et al., Veterinary Sciences 2025; Lamminen T et al., Animals 2023; Pryor PA et al., JAVMA 2001; Hart BL et al., JAVMA 2005; Mills DS et al., PLoS ONE 2011; Ciribassi J et al., AJVR 2003; Stevens BJ et al., JAVMA 2016; Frank D et al., JAVMA 2010; Jerzsele Á et al., JVPT 2018.
- Merck Veterinary Manual: psychotropic agents (2025), cat and dog behavior drug tables, xylitol toxicosis (2025). VCA: gabapentin (2024), fluoxetine (2024). Lilly ML, DACVB, feline psychopharmacology handout (AVSAB, October 2025).
- States: Montana Board of Pharmacy gabapentin fact sheet (September 2025); North Dakota Century Code 19-03.1; Code of Virginia 54.1-3454; NC DHHS gabapentin FAQ for veterinarians; Utah HB 260 (2024) and SB 120 (2025) via summaries; LegalClarity (April 2026) and Addiction Resource (June 2026) as secondary sources.
