Cerenia for Cats — Uses, Dosage, Side Effects & Safety

Cerenia (maropitant citrate) is the most effective anti-vomiting medication available for cats, per Cat Calculators (March 2026) and multiple veterinary reviews. Developed by Zoetis and first approved for dogs in 2007, the injectable form was FDA-approved for use in cats in 2012. The oral tablet form is not FDA-approved for cats (it is only approved for dogs), but veterinarians widely prescribe it off-label for cats based on substantial clinical evidence. Understanding how Cerenia works, what its real side effects are, why “Cerenia killed my cat” searches are appearing online, and when it is truly appropriate for chronic conditions like kidney disease helps cat owners make better-informed decisions with their veterinarian.

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  What does Cerenia do for cats — what is it used for? Cerenia stops nausea and vomiting by blocking NK1 receptors in the brainstem’s vomiting center · Effective against virtually any cause of vomiting · Common uses: acute gastric upset · chronic kidney disease (CKD) nausea · motion sickness · chemotherapy-induced vomiting · pancreatitis · post-surgical/anesthesia nausea · pre-operative sedation (reduces retching rate from 36% to 13%) · It controls the symptom but does not treat the underlying cause — diagnosis is still essential

  Cerenia’s active ingredient, maropitant citrate, is a selective NK1 (neurokinin-1) receptor antagonist. It blocks the binding of substance P — a neurotransmitter in the brainstem’s chemoreceptor trigger zone and vomiting center — preventing the vomiting reflex from being triggered. This central mechanism means Cerenia works against almost any source of nausea signal: gastrointestinal disease, uremic toxins from kidney failure, chemotherapy agents, motion-related signals, or anesthesia. Per GoodRx (2025), common uses in cats include: acute vomiting from gastrointestinal upset; chronic kidney disease (CKD), where uremic toxins stimulate the chemoreceptor trigger zone; motion sickness; chemotherapy-induced vomiting; pancreatitis; and post-surgical nausea. Per Innovet Pet (February 2026), in cats given maropitant before sedation, the retching rate dropped from 36% to 13% in one study. A key clinical principle: Cerenia is powerful at masking vomiting — which means vomiting that returns when the medication ends is important clinical information that should be reported to the veterinarian. Per GoodRx: “Cerenia does not treat the cause of nausea and vomiting. But it can be used to reduce nausea and help your cat feel better, giving your veterinarian time to diagnose the underlying problem.” Chronic vomiting without diagnosis and treatment of the root cause is not an appropriate long-term use of Cerenia alone.
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  Is Cerenia FDA-approved for cats — can vets legally prescribe it? The injectable form of Cerenia is FDA-approved for cats (for treatment of vomiting, cats 4 months and older) · The oral tablet form is NOT FDA-approved for cats — tablets are only FDA-approved for dogs · Vets commonly prescribe the tablets to cats as “off-label” use — this is legal, standard veterinary practice · Off-label use is common in veterinary medicine and does not mean the drug is unsafe for cats; it means FDA has not reviewed that specific label claim · Always follow your veterinarian’s specific directions for off-label use

  The FDA regulatory status of Cerenia for cats is a point of confusion that matters clinically. Per PetMD (January 2026) and Great Pet Care (July 2025): the injectable form of Cerenia (maropitant citrate injectable solution, NADA 141-263) was FDA-approved for use in cats in 2012, specifically for the treatment of vomiting in cats aged 4 months or older. The injectable can be given subcutaneously (under the skin) in cats. The oral tablet form of Cerenia is FDA-approved only for dogs — for prevention of acute vomiting and prevention of vomiting due to motion sickness. Per VCA Animal Hospitals (vcahospitals.com): “Use of the tablets in cats to treat nausea and vomiting is off label (extra label). Many drugs are commonly prescribed for off-label use in veterinary medicine.” Off-label use simply means the drug is being used in a way not specifically reviewed and approved by the FDA — it does not mean the use is experimental or unsafe. The off-label prescription of Cerenia tablets to cats is standard, accepted veterinary practice supported by clinical evidence including the landmark 2015 Quimby et al. blinded, placebo-controlled trial in CKD cats (Colorado State University / PubMed PMID 25336450). Vets prescribing Cerenia tablets to cats are acting within their professional scope and based on published evidence.
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  What is the correct Cerenia dosage for cats by weight? Standard dose: 1 mg per kilogram (kg) of body weight (0.45 mg per pound) once daily · All uses share the same dose — what varies is timing and duration, not the amount · Liver disease: dose may be reduced by 50% — always follow vet’s instructions · Minimum age: 16 weeks (4 months); minimum weight: not under 1 kg without specific vet guidance · Tablet sizes: 16 mg, 24 mg, 60 mg, 160 mg · A 4 kg (8.8 lb) cat receives 4 mg — use a half tablet of the 16 mg tablet · Injectable dose: 1 mg/kg SC (subcutaneously) once daily, up to 5 consecutive days

  The dosing of Cerenia for cats is standardized across all uses at 1 mg per kilogram of body weight once daily, per the FDA product label and Cat Calculators (March 2026). Unlike some medications where dose changes based on the condition being treated, maropitant’s dose is always 1 mg/kg — what changes is the timing, frequency, and duration. For injectable Cerenia in cats: 1 mg/kg given as a subcutaneous (under the skin) injection once daily for up to five consecutive days, per the FDA-approved product label. Subcutaneous injection is the only route approved for cats (intravenous injection is approved for dogs but not listed in the FDA cat-specific label). For off-label oral tablets: Cat Calculators (March 2026) notes: for cats weighing 4 kg (about 8.8 lbs), the 4 mg dose is achieved with half a 16 mg tablet. Cats between 9–16 kg use one 16 mg tablet; cats 17–24 kg use one 24 mg tablet. The 60 mg and 160 mg tablets are generally used for larger dogs; cats rarely require these. Important exceptions: cats with liver disease may require a 50% dose reduction (as the liver metabolizes maropitant) — always follow the veterinarian’s specific instructions. Do not give to cats under 4 months of age or under 1 kg unless specifically instructed by a veterinarian. Never adjust the dose without veterinary guidance — underdosing reduces effectiveness and overdosing carries risk.
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  How is Cerenia given to cats — injection, nasal drops, or tablets? Three forms exist for cats: (1) Injectable: FDA-approved for cats; given subcutaneously (under the skin) by a vet or at home if trained; usually in the scruff of the neck; works within 30–60 minutes (2) Oral tablets: off-label for cats; given by mouth; work in 1–2 hours; available in 16, 24, 60, 160 mg sizes (3) Nasal drops: used for cats with upper respiratory disease — allows the drug to reach the affected area directly; per Fetch pet insurance: vets may prescribe nasal drops specifically for URIs · Injectable vials should be refrigerated; they remain stable for 3 months after first use when refrigerated

  Cerenia is available in three primary forms used in cats. The injectable solution contains 10 mg/mL of maropitant and is FDA-approved for cats. Per Catster (July 2025), the typical injection site for cats is the scruff of the neck (subcutaneous injection into the loose skin at the back of the neck), though other subcutaneous sites may be used. The injection works rapidly — typically within 30–60 minutes, per VetLens (March 2026). Per Great Pet Care (July 2025): the injectable vial, once punctured, remains stable for up to 3 months if stored in the refrigerator. Room-temperature injection causes more pain — refrigerating the vial before administration significantly reduces the pain response (per cats.com, April 2026; Catster, July 2025; and the Zoetis product information). The oral tablets are not FDA-approved for cats but are commonly prescribed off-label. They take 1–2 hours to reach full effect and last approximately 24 hours, per VetLens (March 2026). Nasal drops are a specialized formulation used specifically for cats with upper respiratory disease, per Fetch Pet (October 2022): “If your cat’s struggling with an upper respiratory disease, your vet will probably prescribe nasal drops as it can get right into the affected area.” Not all veterinary practices stock the nasal drop formulation — ask your vet if this form is available and appropriate for your cat.
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  How long does Cerenia take to work in cats — how long does it last? Injectable Cerenia: works within 30–60 minutes · Oral tablets: full effect within 1–2 hours · Duration of both forms: approximately 24 hours — which is why it is dosed once daily · For motion sickness: give tablets 2 hours before travel for best effect · For surgery preparation: typically given before induction, allowing time for full effect before anesthesia begins · Maximum approved duration: up to 5 consecutive days for injectable use

  The onset and duration of Cerenia differ between the injectable and oral forms. Per VetLens (March 2026): injectable Cerenia works within 30–60 minutes of administration, while oral tablets take 1–2 hours to reach full effect. In both cases, the anti-nausea effect lasts approximately 24 hours — which is the clinical basis for the once-daily dosing schedule. This 24-hour duration is significantly longer than antihistamines like diphenhydramine (4–6 hours) or dimenhydrinate (3–6 hours), making Cerenia particularly valuable for situations like post-surgical recovery, chemotherapy support, or managing nausea throughout a car journey. For motion sickness prevention, the standard recommendation is to give the oral tablet at least 2 hours before travel begins and with a small amount of food — both to allow full onset and to reduce the possibility of the medication being vomited before it is absorbed. Per the FDA label for injectable use: the drug can be administered for up to five consecutive days. For chronic conditions such as CKD, the 2015 Quimby et al. placebo-controlled trial (PubMed PMID 25336450) used daily oral administration for two weeks and documented it was well tolerated without significant adverse effects. Long-term chronic use requires veterinary monitoring at regular intervals.
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  What are the side effects of Cerenia in cats — what is really common versus rare? Most common (in decreasing order per FDA adverse event reporting for cats): Depression/lethargy · Anorexia (reduced appetite) · Hypersalivation (drooling) · Pain/vocalization at injection site (approximately 1 in 3 cats; resolves within minutes; refrigerating reduces this) · Less common (<1–2% of cases): Dyspnea · Ataxia (stumbling) · Fever · Recumbency (lying flat/unable to rise) · Vomiting · Panting · Convulsions · Muscle tremors · Rare but documented: Cases of death (including euthanasia) reported in post-approval FDA adverse event data for both cats and dogs — not proven causal, context unknown

  The FDA product label for Cerenia injectable solution (accessed via FDA accessdata.fda.gov and DailyMed) lists the post-approval adverse events reported for cats in decreasing order of reporting frequency: depression/lethargy, anorexia, hypersalivation (drooling), pain/vocalization upon injection, dyspnea (breathing difficulty), ataxia (loss of coordination), fever, recumbency, vomiting (unrelated to the drug’s action), panting, convulsions, and muscle tremors. The FDA label also explicitly states: “Cases of death (including euthanasia) have been reported.” Per cats.com (April 2026): the pain/vocalization upon injection occurs in approximately 1 in 3 cats; it resolves within minutes without treatment and can be significantly mitigated by refrigerating the vial before use. The rarer effects (dyspnea, ataxia, convulsions, fever, recumbency) occur in less than 1–2% of cases per cats.com. Per Great Pet Care (July 2025), citing board-certified DVM Catherine Barnette: “Serious side effects are very rare. The only common side effect of Cerenia includes pain on injection, which resolves within seconds.” The death cases listed in FDA post-approval adverse event data represent reports submitted voluntarily — not necessarily proving Cerenia caused the death (the animal may have been seriously ill with the underlying condition, or in end-stage disease). The FDA explicitly notes: “It is not always possible to reliably estimate the adverse event frequency or establish a causal relationship to product exposure using these data.” These are important context points for the “Cerenia killed my cat” concern discussed next.
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  “Cerenia killed my cat” — what does the evidence actually show? The FDA adverse event reporting system lists “cases of death (including euthanasia)” in the post-approval data for Cerenia in cats and dogs · The FDA explicitly states these reports cannot establish a causal relationship — cats and dogs receiving Cerenia are typically already seriously ill · The most plausible explanations for adverse outcomes: underlying conditions (CKD, liver disease, heart disease) that were already causing the vomiting; incorrect dose; allergic/anaphylactic reaction; interaction with other medications; pre-existing condition missed before administration · Cerenia’s broad safety profile is well-documented — it has been in clinical use since 2007 and toxicity studies show cats tolerate doses up to 10× the therapeutic dose · This does not mean concerns should be dismissed — report any serious adverse event to your vet and to FDA CVM at 1-888-FDA-VETS

  “Cerenia killed my cat” is a search phrase that reflects the real anguish of cat owners who lost a pet after Cerenia was administered. This deserves a direct, honest, evidence-based response. The FDA’s official adverse event data (DailyMed/accessdata.fda.gov) does list “cases of death (including euthanasia)” in the post-approval experience section for Cerenia in cats — this is factual. However, the FDA also explicitly states on the same label: “Not all adverse events are reported to FDA CVM. It is not always possible to reliably estimate the adverse event frequency or establish a causal relationship to product exposure using these data.” This is the critical context. The FDA’s adverse event reporting system collects voluntary reports of bad outcomes that occurred after a medication was used — it cannot determine whether the drug caused the outcome. Cats receiving Cerenia are typically sick animals whose vomiting prompted a vet visit. Many of these cats have serious underlying illnesses (chronic kidney disease, pancreatitis, cancer, heart disease). When a seriously ill cat dies in the days after receiving any medication, the death may be attributed to the medication by grieving owners — this is entirely understandable but not necessarily accurate. Per dayspets.com (December 2024), the plausible risk factors for adverse outcomes include: an underlying health condition (particularly kidney or liver disease) that was not fully diagnosed before Cerenia was prescribed; an incorrect or excessive dose; a true allergic or anaphylactic reaction (rare but possible with any drug); interaction with other protein-bound medications (NSAIDs, cardiac drugs, anticonvulsants); or a pre-existing condition that was simply progressing. Per Innovet Pet (February 2026): “Safety studies show cats tolerated maropitant doses up to 10 times higher than the effective antiemetic dose without adverse clinical signs.” If your cat experienced a serious adverse event after Cerenia, report it to your veterinarian and to the FDA’s Center for Veterinary Medicine at 1-888-FDA-VETS (1-888-332-8387) or at fda.gov/reportproblem. These reports are important — they help FDA monitor real-world safety.
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  Can Cerenia be used for cats with kidney disease (CKD) — does it work long-term? Yes — maropitant has the strongest published evidence for use in CKD cats among any anti-nausea drug for this condition · 2015 Quimby et al. blinded, placebo-controlled trial (Colorado State University; PubMed PMID 25336450): 41 cats with Stage II–III CKD; orally administered maropitant (4 mg daily, median ~1.1 mg/kg) for 2 weeks significantly reduced vomiting (P<0.01) · Appetite and weight did not significantly improve in the 2-week study period — CKD cats need comprehensive care beyond nausea management · Long-term pharmacokinetic studies: maropitant appears safe in cats at therapeutic doses · Liver disease requires dose reduction — CKD does not, but kidney monitoring during treatment is standard of care

  Chronic kidney disease (CKD) is one of the most common conditions in senior cats, affecting at least 50% of elderly cats according to the Quimby et al. study background. Uremic toxins generated by failing kidneys stimulate the chemoreceptor trigger zone of the area postrema in the brainstem — the same center that Cerenia targets. This is why maropitant is particularly rational for CKD-related nausea. The landmark blinded, placebo-controlled clinical trial by Quimby et al. (published in Journal of Feline Medicine and Surgery, 2015; PubMed PMID 25336450; Colorado State University) enrolled 41 cats with stable IRIS Stage II or III CKD and measured outcomes over two weeks. The study found that orally administered maropitant at 4 mg daily (approximately 1.1 mg/kg) produced a statistically significant reduction in vomiting episodes compared to placebo (P<0.01). However — as EveryCat Health Foundation carefully notes — appetite and weight did not improve significantly within the 2-week trial period, suggesting that nausea control alone is not sufficient for full CKD management and that longer studies are needed for weight and appetite outcomes. La Petite Labs (February 2026) reinforces this clinical reality: CKD cats receiving Cerenia should be managed with a comprehensive plan including hydration support (subcutaneous fluids in many cases), a kidney-appropriate diet, regular weight monitoring, and regular blood and urine testing — not Cerenia alone. Vomiting that returns when Cerenia stops is clinically important information to report to the vet. CKD does not require dose reduction of maropitant, but cats with concurrent liver disease may need a 50% dose reduction.
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  Does Cerenia make cats lose appetite — is that a side effect? Paradoxically, reduced appetite (anorexia) appears in the FDA adverse event data as a listed side effect · However, in cats with CKD or GI disease, nausea itself suppresses appetite — so controlling nausea with Cerenia often improves appetite and eating · The 2015 CKD trial did not find a statistically significant improvement in appetite in the 2-week period, but the trial was limited in duration · If your cat was prescribed Cerenia specifically to improve appetite as part of CKD management: monitor food intake and report any decrease to your vet · Cerenia alone is rarely sufficient for appetite restoration in seriously ill cats — mirtazapine and other appetite stimulants may be used alongside it

  The relationship between Cerenia and appetite in cats is clinically nuanced. The FDA adverse event data for cats lists anorexia (reduced appetite) as a reported adverse event — making it a legitimate concern. However, this must be understood in context. Cats that are prescribed Cerenia are almost always nauseous — and nausea itself is one of the most powerful suppressors of appetite in any species. When Cerenia controls nausea effectively, many cats eat better because the nausea driving their food refusal has been resolved. Per VetLens (March 2026): “decreased appetite initially” is listed as a paradoxical side effect that “some cats eat less at first.” The 2015 Quimby et al. CKD trial did not find a statistically significant improvement in appetite or weight gain during the 2-week study period despite significant reduction in vomiting — suggesting that appetite recovery in sick cats requires more than just vomiting control. The reason for this may be that CKD cats have multiple overlapping contributors to inappetence beyond vomiting alone: oral ulceration, phosphorus accumulation, nausea that occurs even without visible vomiting, and systemic malaise. For cats with serious appetite loss alongside nausea, veterinarians often combine Cerenia (for nausea/vomiting) with mirtazapine (an appetite stimulant also used as an anti-nausea agent; per EveryCat Health Foundation, Quimby and Lunn 2013 crossover trial confirmed mirtazapine’s appetite-stimulating effects in CKD cats). If your cat’s appetite worsens after starting Cerenia, this should be reported to your veterinarian immediately rather than interpreted as a normal expected outcome.
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  When should Cerenia NOT be given to cats — what are the contraindications? Do NOT give Cerenia to a cat if: · Known hypersensitivity (allergy) to maropitant or any component of the formulation · Kittens under 16 weeks (4 months) of age — per Zoetis and FDA label · Cat weighing under 1 kg unless specifically prescribed by vet · Gastrointestinal obstruction (blocked intestine/stomach) suspected — Cerenia masks symptoms; obstruction requires surgery, not anti-nausea medication · Toxin ingestion suspected — Cerenia may mask symptoms needed for diagnosis · Use with caution in cats with liver disease (hepatic dysfunction) — may require 50% dose reduction · Cats taking protein-bound drugs (NSAIDs, cardiac medications, anticonvulsants) — drug interaction not fully studied · Breeding, pregnant, or nursing cats — safety not established

  Certain situations make Cerenia use genuinely dangerous for cats — not merely cautionary. Per the FDA product label (zoetisus.com dosing chart; accessdata.fda.gov; DailyMed) and cats.com (April 2026): Cerenia should not be used in cats where gastrointestinal obstruction is suspected — the drug’s powerful vomiting suppression would mask the vomiting that is a critical symptom of obstruction, delaying potentially lifesaving surgical intervention. Similarly, it should not be given to a cat that may have ingested a toxin, because vomiting in that context may be protective and masking it could worsen the outcome. Per Zoetis: “Safe use has not been evaluated in cats and dogs with gastrointestinal obstruction, or those that have ingested toxins.” Liver disease (hepatic dysfunction) requires caution because maropitant is extensively metabolized by the liver — impaired liver function leads to higher drug concentrations and longer duration, potentially causing adverse effects at standard doses. A 50% dose reduction is standard for liver disease patients. Per cats.com: Cerenia is a protein-bound drug, and its concurrent use with other protein-bound drugs (NSAIDs such as meloxicam, cardiac medications, certain anticonvulsants) has not been studied — drug displacement interactions are theoretically possible. The safety of Cerenia in breeding, pregnant, or nursing cats has not been established. Per dogcatcare.org: cats with known hypersensitivity to maropitant or any formulation component should not receive it. Always provide your veterinarian with a complete medication list before Cerenia is prescribed — including all supplements, flea/tick products, and any OTC medications.

Sources: FDA/DailyMed (dailymed.nlm.nih.gov/fda accessdata.fda.gov — Cerenia injectable label NADA 141-263; cats 4 months+; 1 mg/kg SC; adverse events cats in decreasing order: depression/lethargy, anorexia, hypersalivation, pain/vocalization, dyspnea, ataxia, fever, recumbency, vomiting, panting, convulsion, muscle tremor; cases of death reported; cannot establish causal relationship; GI obstruction/toxin contraindicated; hepatic dysfunction caution); PetMD Jan 2026 (Cerenia cats; injectable FDA approved cats 2012; tablets off-label cats; petmd.com); GoodRx/Dr. Sarah Wooten DVM 2025 (Cerenia cats; fast-acting; not treat underlying cause; side effects; CKD/motion/chemo/pancreatitis; goodrx.com); Great Pet Care/Catherine Barnette DVM Jul 2025 (serious side effects very rare; injection pain resolves seconds; refrigerate vial; 3 months after opening refrigerated; greatpetcare.com); VetLens Mar 2026 (1 mg/kg all uses; injectable 30–60 min; tablets 1–2 hr; 24-hr effect; decreased appetite paradoxical; vetlens.com); Catster/Catherine Barnette DVM Jul 2025 (injection scruff; 16/24/60/160 mg tablets; off-label tablets cats; catster.com); Cats.com Apr 2026 (1 in 3 cats injection pain/vocalization; <1–2% rare effects; protein-bound drug interactions; refrigerate reduces pain; cats.com); Innovet Pet Feb 2026 (retching 36% → 13% pre-sedation; 10× safety margin; NK1 mechanism; CKD trial context; innovetpet.com); La Petite Labs Feb 2026 (CKD context; comprehensive care; rebound vomiting; litter box monitoring; lapetitelabs.com); Quimby JM et al. 2015 PubMed (PMID 25336450; pmc.ncbi.nlm.nih.gov/articles/PMC11104052; Colorado State University; 41 cats Stage II–III CKD; 4 mg orally daily 2 weeks; P<0.01 vomiting reduction; long-term pharmacokinetic safe); EveryCat Health Foundation (everycat.org — CKD trial; appetite/weight not significant 2-week period; longer trials needed; Quimby Lunn 2013 mirtazapine); Cat Calculators Mar 2026 (1 mg/kg all uses; liver disease 50% dose reduction; tablet sizing guide; catcalculators.com); Zoetis dosing chart 2025 (zoetisus.com — cats 4 months+; SC only cats; 24-hour; GI obstruction/toxin caution; hepatic caution); DaysPets Dec 2024 (Cerenia killed my cat context; underlying conditions; overdose; allergic reaction; dayspets.com); Fetch Pet Oct 2022 (nasal drops URIs; tabs vs injection; fetchpet.com); Dog Cat Care (dogcatcare.org — hypersensitivity contraindication; protein-bound interactions; pregnancy safety not established); VCA Animal Hospitals (vcahospitals.com — off-label tablets cats; follow vet directions)

Sources: FDA product label / Cat Calculators Mar 2026 (1 mg/kg; 50% liver disease); VetLens Mar 2026 (onset/duration; $5–$10); Quimby JM et al. 2015 JFMS/PubMed PMID 25336450 (CKD P<0.01); GoodRx (generic pricing)

Sources: Great Pet Care/Barnette DVM Jul 2025 (injection pain resolves; serious rare; greatpetcare.com); Cats.com Apr 2026 (1 in 3 injection pain; <1–2% rare; protein-bound; cats.com); Quimby JM et al. 2015 PubMed PMID 25336450 (Colorado State; CKD P<0.01; appetite/weight 2-week result); EveryCat Health Foundation (CKD trial; appetite/weight not significant; everycat.org); La Petite Labs Feb 2026 (CKD monitoring; rebound vomiting; lapetitelabs.com); VetLens Mar 2026 (motion sickness; tablets 1–2 hr onset; vetlens.com); FDA (accessdata.fda.gov — GI obstruction/toxin contraindicated; hepatic caution; pregnancy not established; protein-bound interaction not studied); Cat Calculators Mar 2026 (liver 50% dose reduction; tablet sizing; catcalculators.com); DaysPets Dec 2024 (risk factors adverse outcomes; dayspets.com); Zoetis (1-888-963-8471; manufacturer adverse event reporting); FDA CVM (1-888-332-8387; fda.gov/reportproblem)

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