What Is Cerenia and What Does It Treat?
Cerenia is the brand name for maropitant citrate, a prescription anti-nausea and anti-vomiting medication (an antiemetic) for dogs. It is FDA-approved for dogs and is one of the most widely used and effective anti-sickness medicines in veterinary practice.
Cerenia works in a clever, targeted way. It is a neurokinin-1 (NK-1) receptor antagonist: it blocks the action of a chemical messenger called substance P at the receptors in the brain’s “vomiting centre.” Because substance P is a final common pathway for many different vomiting triggers, blocking it makes Cerenia effective against vomiting from a wide variety of causes.
Veterinarians use Cerenia for two main, distinct purposes:
- Prevention and treatment of acute vomiting — for example from gastrointestinal upset, infections, or as supportive care during the treatment of other illnesses, and to control nausea and vomiting associated with chemotherapy or some other medications.
- Prevention of vomiting due to motion sickness — helping dogs that get carsick or struggle with travel.
The single most important thing to understand about Cerenia is that these two uses require very different doses — the motion-sickness dose is four times higher than the acute-vomiting dose. Using the wrong one is a common mistake, which is why the calculator above asks you to choose the use first.
Cerenia is a prescription medicine, and vomiting can be a sign of a serious problem, so it should be used under veterinary direction. For more, see PuppaDogs’ guide to Cerenia (maropitant citrate) for dogs.
How the Cerenia Dosage Calculator Works
The calculator first asks what the Cerenia is for, because the dose is so different, and then estimates the dose from your dog’s body weight. It:
- Applies 2 mg/kg for acute vomiting or 8 mg/kg for motion sickness.
- Converts it into a number of 16, 24, 60 or 160 mg tablets.
- Shows the correct schedule and timing for each use.
- Flags liver disease and the minimum-age considerations.
Enter your dog’s weight, choose the use, select the tablet strength, tick any health considerations, then press Calculate Dose.
How Cerenia Doses Are Calculated for Dogs
Two Doses for Two Jobs
| Use | Dose | Schedule |
|---|---|---|
| Acute vomiting | 2 mg/kg once daily | Once daily until vomiting resolves (commonly up to 5 days) |
| Motion sickness | 8 mg/kg once daily | Once daily, up to 2 consecutive days, given ≥2 hours before travel |
For acute vomiting, Cerenia tablets are labelled for dogs 7 months of age and older. For motion sickness, the tablets are labelled for dogs 4 months of age and older. An injectable form of Cerenia also exists for in-clinic use.
Why the Motion-Sickness Dose Is Higher
This often surprises owners. The 8 mg/kg motion-sickness dose is four times the 2 mg/kg vomiting dose. The higher dose reflects what is needed to reliably prevent travel-induced vomiting before it starts. Always be certain which dose you are using — the calculator keeps them separate for exactly this reason.
Cerenia Dosage Chart for Dogs
This chart shows both doses. It is a reference only — your veterinarian’s prescription takes priority.
| Dog weight | Acute vomiting (2 mg/kg) | Motion sickness (8 mg/kg) |
|---|---|---|
| 5 kg (11 lb) | ~10 mg | ~40 mg |
| 10 kg (22 lb) | ~20 mg | ~80 mg |
| 20 kg (44 lb) | ~40 mg | ~160 mg |
| 30 kg (66 lb) | ~60 mg | ~240 mg |
| 40 kg (88 lb) | ~80 mg | ~320 mg |
How to Give Cerenia to Your Dog
For Acute Vomiting
- Give 2 mg/kg once daily, at roughly the same time each day.
- It can be given with or without food.
- Continue until the vomiting resolves — commonly up to 5 consecutive days — as directed by your vet.
For Motion Sickness
- Give 8 mg/kg once daily, at least 2 hours before travel.
- Give it with a small amount of food — taking the larger motion-sickness dose on a completely empty stomach can itself cause some dogs to vomit, so a small snack helps.
- It can be used for up to 2 consecutive days.
Side Effects and Safety
Cerenia is generally very well tolerated. Side effects are uncommon and usually mild — occasionally drooling, mild lethargy or a reduced appetite, and rarely diarrhoea. With the injectable form, some dogs show a brief reaction at the injection site, but this is not relevant to the oral tablets.
When to Use Caution
- Liver disease — maropitant is processed by the liver; use with veterinary caution.
- Young puppies — note the minimum ages (7 months for vomiting, 4 months for motion sickness on the tablet label); younger puppies need specific veterinary direction.
- Pregnant or nursing dogs — use only with veterinary approval.
The Most Important Point: Why Is Your Dog Vomiting?
Cerenia is excellent at stopping vomiting — but vomiting is a symptom, not a diagnosis. It can be caused by something minor, or by something serious such as a gastrointestinal obstruction (a swallowed foreign object), poisoning, pancreatitis, kidney disease or organ failure.
The danger of simply suppressing vomiting without understanding the cause is that it can mask a serious, worsening problem. Repeated or severe vomiting also rapidly causes dehydration. So while Cerenia is a valuable tool, persistent vomiting, vomiting with other signs (lethargy, a painful or bloated belly, no appetite, blood in the vomit), or any vomiting in a dog that might have swallowed something it should not have, needs a prompt veterinary examination — not just an anti-sickness tablet.
PuppaDogs also covers related options for travel and nausea, including the metoclopramide calculator and a guide to Dramamine for travel sickness.
Treatment Duration
For acute vomiting, Cerenia is typically used as a short course, commonly up to 5 consecutive days, until the vomiting settles. For motion sickness, it is used as needed, up to 2 consecutive days around travel. Your veterinarian will set the appropriate length for your dog’s situation.
Conclusion
Cerenia (maropitant) is a highly effective, FDA-approved anti-sickness medication for dogs — but the key to using it correctly is remembering it has two doses for two jobs: 2 mg/kg once daily for acute vomiting, and 8 mg/kg once daily for motion sickness, given at least 2 hours before travel with a small snack. The calculator above keeps these separate and gives you the right figure. Above all, remember that Cerenia stops the *symptom* of vomiting — so any persistent, severe or unexplained vomiting still needs your veterinarian to find and treat the *cause*.
Frequently Asked Questions
How much Cerenia do I give my dog?
It depends on the purpose. For acute vomiting, the Cerenia (maropitant) dose for dogs is 2 mg/kg of body weight once daily. For motion sickness, the dose is much higher – 8 mg/kg once daily, given at least 2 hours before travel. Always be sure which use you are dosing for, and confirm with your veterinarian.
Why is the Cerenia motion sickness dose higher than the vomiting dose?
The motion-sickness dose (8 mg/kg) is four times the acute-vomiting dose (2 mg/kg). The higher dose is what is needed to reliably prevent travel-induced vomiting before it starts. It is important not to confuse the two – the calculator above keeps them separate for this reason.
When should I give my dog Cerenia for car sickness?
For motion sickness, give Cerenia at the 8 mg/kg dose at least 2 hours before travel, with a small amount of food. Taking the larger motion-sickness dose on a completely empty stomach can itself cause some dogs to vomit, so a small snack helps. It can be used for up to 2 consecutive days.
How long can a dog take Cerenia?
For acute vomiting, Cerenia is typically given once daily until the vomiting resolves, commonly up to 5 consecutive days. For motion sickness it is used as needed for up to 2 consecutive days around travel. Your veterinarian sets the appropriate length for your dog’s situation.
What are the side effects of Cerenia in dogs?
Cerenia is generally very well tolerated. Side effects are uncommon and usually mild, such as occasional drooling, mild lethargy or a reduced appetite, and rarely diarrhoea. Tell your veterinarian if any side effects are marked or persistent.
Is it safe to just stop my dog’s vomiting with Cerenia?
Cerenia is excellent at stopping vomiting, but vomiting is a symptom rather than a diagnosis. It can be caused by serious problems such as an intestinal obstruction, poisoning or organ disease, and simply suppressing it can mask a worsening illness. Persistent, severe or unexplained vomiting always needs a prompt veterinary examination to find the cause.
Related PuppaDogs Calculators
Continue building your dog’s personalised care plan with these related PuppaDogs calculators:
- Dog Pregnancy / Whelping Due-Date Calculator
- Puppy Weight Predictor (Adult Weight Calculator)
- Heatstroke Risk Calculator for Dogs
- Bloat (GDV) Risk Calculator for Dogs
- Dog Life Expectancy Calculator (Breed, Body Condition, Lifestyle)
- Spay/Neuter Timing Calculator for Dogs (Breed-Specific)
References & Further Reading
The dosing ranges and safety information on this page are drawn from the following veterinary references. Always defer to your own veterinarian and the manufacturer’s label for your specific product.
- Cerenia (maropitant citrate) – FDA-approved veterinary label and prescribing information, Zoetis. dailymed.nlm.nih.gov.
- Plumb DC. Plumb’s Veterinary Drug Handbook. 10th ed. Hoboken, NJ: Wiley-Blackwell, 2023 – maropitant citrate monograph.
- Merck Veterinary Manual. Antiemetic drugs; vomiting in small animals. merckvetmanual.com.
- American Animal Hospital Association (AAHA). Management of acute vomiting in dogs. aaha.org.
- PuppaDogs. Cerenia (Maropitant Citrate) for Dogs: Benefits, Dosage, Side Effects, and More. puppadogs.com.
Veronica Troso, RVN
Veronica Troso is a Registered Veterinary Nurse with experience in small animal practice in the United Kingdom. She works closely with veterinary surgeons in the diagnosis, treatment, and ongoing care of companion animals, with particular interests in preventive healthcare, client education, nutrition, and animal welfare. She is also a SIUA canine behaviourist and has a certificate in Feline Medicine with ISFM Throughout her career, Veronica has been involved in educating pet owners on a wide range of topics, including preventative medicine, weight management, post-operative care, and long-term health conditions. She is passionate about making veterinary information accessible, accurate, and easy for pet owners to understand. As an expert reviewer, Veronica helps ensure veterinary content is clinically accurate, practical, and aligned with current standards of care while remaining clear and engaging for readers.
