# How Long Does Cerenia Last in Cats? Cerenia for cats how long does it last? In most cats, a single dose of Cerenia (maropitant) helps control vomiting for about 24 hours, which is why veterinarians commonly give it once daily. Your own cat's duration can be a little shorter or longer depending on the dose, the route used, and how sick your cat is. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - A single dose of Cerenia generally suppresses vomiting for roughly 24 hours in cats, so it is usually given once a day. - Cerenia comes as an injectable solution and as tablets, and both are labeled for use in cats. - A compounded transdermal form has been studied in cats at 4 mg per cat once daily for five consecutive days, applied to the inner ear [1]. - Your veterinarian calculates the exact dose from your cat's weight and health, so never split or guess a dose on your own. - If your cat keeps vomiting after a dose, call your veterinarian instead of giving extra medicine. ## What Cerenia Is and What Veterinarians Use It For Cerenia is the brand name for maropitant citrate. It is a prescription antiemetic, which means it is used to stop or prevent vomiting. It is labeled for the treatment of vomiting in dogs and cats [2]. Veterinarians reach for Cerenia in several everyday situations. They use it for sudden vomiting, for vomiting tied to stomach or intestinal upset, and before surgery or chemotherapy when nausea is expected. It is also used when a cat is vomiting and cannot keep oral medicine or food down, because the injectable form can be given by a veterinarian even when the stomach is unsettled. Some cats vomit because of a problem somewhere else in the body, such as liver disease or a respiratory infection. In those cases Cerenia may be one part of a larger treatment plan. For example, cats with acute cholangiohepatitis, a liver and bile duct condition, have been managed with a combination of antimicrobials, liver support, stomach protectants, and antiemetic drugs [3]. Cerenia treats the symptom, not the underlying disease, so finding the cause still matters. If your cat is not urinating normally or is recovering from surgery, vomiting can be a sign of a separate urgent problem. You can read more about that in [How Long Can A Cat Safely Go Without Urinating](/knowledge/veterinary-medicine/toxicology-and-food-safety/how-long-can-a-cat-safely-go-without-urinating) and [How Long Can A Cat Go Without Peeing After Surgery](/knowledge/veterinary-medicine/symptom-guides/how-long-can-a-cat-go-without-peeing-after-surgery). ## How Cerenia Works in Cats Vomiting is triggered when the brain's vomiting center gets a signal. One of the chemicals that carries that signal is substance P, and it works by docking onto neurokinin-1 (NK-1) receptors. Cerenia is an NK-1 receptor antagonist, which means it blocks those receptors so the vomiting signal cannot get through [2]. Because it acts on the brain's trigger point instead of only on the stomach, Cerenia can quiet nausea and vomiting from many different causes. That is part of why it is so widely used. One thing owners sometimes notice is that Cerenia can slow the movement of the stomach and intestines. In a study of healthy adult dogs, a 1 mg/kg subcutaneous dose of maropitant significantly decreased the rate of peristalsis (the wave-like muscle contractions that move food along) in the stomach and jejunum [2]. The same study did not find significant changes in intestinal diameter or wall thickness [2]. This effect is one reason veterinarians use Cerenia thoughtfully, especially in cats with suspected intestinal blockage, because slowed gut movement can blur the picture on imaging. ## Cerenia Dosing Basics for Cats ### Who decides the dose Your veterinarian does. The dose depends on your cat's weight, the reason for vomiting, and whether the medicine is given by injection, by mouth, or through the skin. Never use a dose meant for a dog, and never repeat a dose early because you think it wore off. ### How it is given Cerenia is available as tablets and as an injectable solution, and both routes are used in cats [1]. The injectable form is typically given by a veterinarian in the clinic. Tablets are usually given at home, often with a small amount of food, though some cats take them plain. A third option is a compounded transdermal gel. In one study, eight cats with vomiting were given compounded transdermal maropitant at 4 mg per cat once daily, applied to the inner surface of the ear, for five consecutive days [1]. This is not the same as the commercial product, and it must be prepared by a compounding pharmacy. Ask your veterinarian whether this route makes sense for your cat. ### Missed doses If you miss a dose, give it when you remember, unless it is almost time for the next one. In that case, skip the missed dose and go back to your regular schedule. Do not double up. If your cat has vomited the dose back up, call your veterinarian before giving another one. ### How long a course can continue There is no single number that fits every cat. A cat with a short bout of vomiting may need only one or two doses. A cat with a longer-term problem may stay on it longer under veterinary supervision. In the transdermal study, cats received maropitant once daily for five consecutive days [1]. In a shelter study of cats with upper respiratory disease, maropitant was given every 12 hours for 7 days [4]. Those are study conditions, not a general rule for your cat. The length of treatment should be set by your veterinarian based on what is causing the vomiting. ## Common and Serious Side Effects | Side effect | How common or serious | What to do | |---|---|---| | Sleepiness or mild sedation | Common and usually mild | Let your cat rest. Mention it at the next visit if it persists. | | Drooling or lip smacking after a tablet | Common, often from the taste | Give with a small treat or food if your vet approves. | | Vomiting that continues despite the dose | Serious, means the cause is not controlled | Call your veterinarian the same day. | | Slowed stomach and intestinal movement | Possible, seen as decreased peristalsis in dogs given maropitant [2] | Report any bloating, no appetite, or no bowel movement to your vet. | | Signs of an allergic reaction such as facial swelling, hives, or trouble breathing | Rare but an emergency | Stop and seek emergency veterinary care right away. | | Injection site reaction | Uncommon, usually mild | Have your veterinarian check the site if it looks sore or swollen. | Most cats tolerate Cerenia well. The most reliable sign that something is wrong is not a side effect at all, it is vomiting that will not stop. That points to the underlying problem, not the medicine. ## Who Should Not Take Cerenia and What It Interacts With Cerenia is a prescription medicine, and your veterinarian will decide whether it is safe for your cat. Cats with liver disease need extra care, because maropitant is processed by the liver. Cats who are pregnant, nursing, or used for breeding are usually not given it unless the veterinarian decides the benefit clearly outweighs the risk. Tell your veterinarian about every medicine, supplement, and home remedy your cat takes. This matters most for other drugs that affect the liver or the nervous system. Do not start any new medicine, including over-the-counter products, without asking first. Cerenia is not a treatment for a blocked intestine, a foreign body, or a metabolic disease. If your cat is vomiting because of one of those, Cerenia may quiet the symptom while the real problem gets worse. That is why a veterinary exam and sometimes blood work or imaging come first. ## Overdose and When to Call for Help If your cat gets more Cerenia than prescribed, call your veterinarian or a pet poison control hotline right away. Do not wait for symptoms. Bring the packaging with you so the veterinarian knows the strength and how much was taken. Watch for vomiting, drooling, wobbliness, unusual sleepiness, or a cat who will not eat or drink. These can be signs of too much medicine or of the illness itself. Either way, your cat needs to be seen. If your cat cannot keep water down, is vomiting repeatedly, or seems painful or depressed, that is an emergency. Go to an emergency clinic instead of waiting for a callback. ## Limitations and When to Contact a Veterinarian Cerenia controls vomiting, but it does not tell you why your cat is vomiting. That answer comes from an exam, a history, and often lab work or imaging. Every cat is different, and only your veterinarian can judge what is safe and appropriate for yours. Contact your veterinarian the same day if your cat vomits more than a few times in a day, vomits blood, refuses food for more than 24 hours, or seems to improve and then gets worse again. Go to an emergency clinic now if your cat is straining to vomit with nothing coming up, has a swollen or painful belly, is breathing fast or open-mouthed, collapses, has a seizure, or cannot stand. A cat who has not urinated in many hours also needs urgent care. For more on that, see [How Long Can A Cat Go Without Peeing Or Pooping](/knowledge/veterinary-medicine/symptom-guides/how-long-can-a-cat-go-without-peeing-or-pooping) and [How Long Can A Cat Live Without Peeing](/knowledge/veterinary-medicine/symptom-guides/how-long-can-a-cat-live-without-peeing). Schedule a routine visit if your cat has repeated bouts of vomiting over weeks, is losing weight, or has vomiting that always happens after meals. Older cats with ongoing vomiting and other signs may need screening for chronic conditions. You can read about one of them in [How Long Can An Older Cat Live With Kidney Disease](/knowledge/veterinary-medicine/clinical-methods/how-long-can-an-older-cat-live-with-kidney-disease). ## Frequently Asked Questions ### Can I give my cat Cerenia every day? Yes, in many cases a veterinarian will prescribe it once daily, and longer schedules exist for specific conditions. In one study, cats with upper respiratory disease received maropitant every 12 hours for 7 days [4]. How long your cat stays on it depends on the cause of the vomiting and how your cat responds. ### How fast does Cerenia start working in a cat? It starts working within a few hours of being given, which is why many cats stop vomiting the same day. The injectable form tends to act quickly because it goes straight into the body. If your cat is still vomiting several hours after a dose, call your veterinarian. ### Can I stop Cerenia on my own once my cat stops vomiting? You can usually stop once your cat is eating and drinking normally, but ask your veterinarian first. Stopping too early can let vomiting return if the underlying problem is not resolved. Your veterinarian will tell you whether to finish a set course or stop when signs clear. ### Is Cerenia safe to give with other medicines? Often yes, but it depends on the other medicines. Cerenia is processed by the liver, so drugs that also affect the liver deserve extra caution. Always give your veterinarian a complete list of everything your cat takes, including supplements and flea or worm products. ### What if my cat vomits right after taking Cerenia? Call your veterinarian before giving another dose. The tablet may not have been absorbed, and giving a second dose could mean your cat gets more medicine than intended. Your veterinarian may switch to the injectable form or adjust the plan. ### Does Cerenia work for nausea without vomiting? It can help with nausea, and veterinarians often use it when a cat is drooling, lip smacking, or refusing food without actually vomiting. Nausea is harder to measure than vomiting, so your veterinarian will judge by your cat's appetite and behavior. If your cat still will not eat after treatment, that needs a recheck. ## Related Articles - [How Long Can An Older Cat Live With Kidney Disease](/knowledge/veterinary-medicine/clinical-methods/how-long-can-an-older-cat-live-with-kidney-disease) - [How Long Can A Cat Safely Go Without Urinating](/knowledge/veterinary-medicine/toxicology-and-food-safety/how-long-can-a-cat-safely-go-without-urinating) - [How Long Can A Cat Go Without Peeing Or Pooping](/knowledge/veterinary-medicine/symptom-guides/how-long-can-a-cat-go-without-peeing-or-pooping) - [How Long Can A Cat Live Without Peeing](/knowledge/veterinary-medicine/symptom-guides/how-long-can-a-cat-live-without-peeing) - [How Long Can A Cat Go Without Peeing After Surgery](/knowledge/veterinary-medicine/symptom-guides/how-long-can-a-cat-go-without-peeing-after-surgery) - [How Long Can A Healthy Cat Go Without Peeing](/knowledge/veterinary-medicine/symptom-guides/how-long-can-a-healthy-cat-go-without-peeing) - [Cerenia for Cats: Side Effects and Dosing Basics](/knowledge/veterinary-medicine/pet-medication-guide/cerenia-cats-side-effects-dosage) - [How to Give Cerenia to a Cat: Tips That Work](/knowledge/veterinary-medicine/pet-medication-guide/how-to-give-cerenia-cats) - [Cerenia Nasal Drops and Injections for Cats](/knowledge/veterinary-medicine/pet-medication-guide/cerenia-nasal-drops-injection-cats) ## References 1. [Evaluation of the efficacy of transdermal administration of maropitant in managing vomiting in cats](https://pubmed.ncbi.nlm.nih.gov/36589400/). Open veterinary journal, 2022. 2. [Maropitant Citrate Administration Significantly Decreases the Rate of Peristalsis in the Stomach and Jejunum and Does Not Significantly Alter Intestinal Diameter or Intestinal Wall Thickness in Healthy Adult Dogs](https://pubmed.ncbi.nlm.nih.gov/42083426/). Veterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association, 2026. 3. [Case Report: Transient myocardial thickening in a cat secondary to acute cholangiohepatitis](https://pubmed.ncbi.nlm.nih.gov/41624289/). Frontiers in veterinary science, 2025. 4. [Effects of intranasal maropitant on clinical signs of naturally acquired upper respiratory disease in shelter cats](https://pubmed.ncbi.nlm.nih.gov/40008570/). Journal of feline medicine and surgery, 2025. ## Further Reading - [American Veterinary Medical Association: First Aid Tips for Pet Owners](https://www.avma.org/resources-tools/pet-owners/emergencycare/first-aid-tips-pet-owners) - [Merck Veterinary Manual: Cat Owners](https://www.merckvetmanual.com/cat-owners) - [Cornell Feline Health Center: Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information)