Maropitant (Cerenia) for Dogs: Uses, Dosage & Side Effects

See your vet immediately if your dog is vomiting repeatedly, cannot keep water down, seems weak, has a swollen belly, has blood in the vomit, may have eaten a toxin, or could have swallowed a foreign object. Anti-nausea medication can help your dog feel better, but it does not replace finding the cause.

Maropitant citrate, sold as Cerenia, is a prescription medication. It should only be used under your vet's guidance because the right dose, timing, and formulation depend on your dog's age, weight, reason for vomiting, and overall health.

This article is for education only. It is not a diagnosis or a treatment plan for your individual dog.

Maropitant citrate is a prescription anti-nausea and anti-vomiting medication for dogs. The best-known brand name is Cerenia. It works by blocking substance P at NK1 receptors in the brain's vomiting center, which helps reduce vomiting from many different triggers.

That broad action is why your vet may use it for stomach upset, pancreatitis support, recovery after anesthesia, travel-related vomiting, or nausea linked to other diseases. It is often given once daily, and many dogs start feeling better within hours.

Cerenia helps control the symptom of vomiting, but it does not tell you why your dog is vomiting. A dog with ongoing vomiting may still need an exam, lab work, X-rays, ultrasound, or other testing to look for dehydration, obstruction, toxin exposure, infection, or organ disease.

Your vet may prescribe maropitant for acute vomiting from many causes, including dietary upset, gastroenteritis, pancreatitis support, medication-related nausea, or recovery after procedures. It is also FDA-approved in dogs for vomiting due to motion sickness.

In practice, vets also use maropitant as part of a broader nausea-control plan. That may include fluids, a bland diet, pain control, stomach protectants, deworming, or diagnostics to address the underlying problem. In some dogs, your vet may combine it with another anti-nausea medication if symptoms are severe or persistent.

Because vomiting can be protective in some situations, maropitant is not always the first step at home. If your dog may have eaten a toxin or swallowed a foreign object, your vet may want to evaluate your dog before suppressing vomiting.

Always follow your vet's instructions and the prescription label. Typical labeled dosing in dogs is 2 mg/kg by mouth once daily for acute vomiting, 1 mg/kg by injection once daily for acute vomiting, and 8 mg/kg by mouth once daily for up to 2 days for motion sickness. For travel, it is commonly given at least 2 hours before the trip.

Cerenia tablets come in 16 mg, 24 mg, 60 mg, and 160 mg strengths. Your vet will match the tablet size to your dog's body weight and treatment goal. Puppies have age-related restrictions: oral use for acute vomiting is generally not for dogs under 8 weeks, and oral use for motion sickness is generally not for dogs under 16 weeks.

Many dogs tolerate the tablet best with a small meal or light snack. Avoid wrapping it tightly in a large, fatty treat, which can delay dissolution. If your dog vomits after a dose, misses a dose, or seems worse instead of better, contact your vet before giving more medication.

Most dogs tolerate maropitant well, but side effects can happen. The more common ones include vomiting or drooling after dosing, especially at the higher motion-sickness dose, plus decreased appetite, diarrhea, and tiredness.

Less common but more concerning effects include unsteady walking, muscle tremors, allergic reactions, or continued vomiting despite treatment. Injectable maropitant can also cause pain, stinging, swelling, or vocalization at the injection site.

Call your vet promptly if side effects are persistent, if your dog seems weak or dehydrated, or if vomiting continues even though your dog received Cerenia. That can be a sign the underlying problem needs more attention.

Maropitant is highly protein bound and is metabolized by the liver, so your vet should review all medications and supplements your dog takes before prescribing it. Extra caution is recommended when it is used with other highly protein-bound drugs, including some NSAIDs, cardiac medications, anticonvulsants, and behavior medications.

Your vet may also be more cautious if your dog is taking medications that can affect liver metabolism. Published veterinary guidance specifically notes caution with drugs such as phenobarbital, erythromycin, ketoconazole, itraconazole, and chloramphenicol.

This does not mean maropitant cannot be used with other medications. It means your vet may adjust the plan, monitor more closely, or choose a different anti-nausea option depending on your dog's full medical picture.