Cerenia (Maropitant) for Dogs & Cats

Cerenia (Maropitant) for Dogs & Cats is a vet-prescribed medication for vomiting. Cerenia (maropitant) is a prescription anti-nausea and anti-vomiting medication for dogs and cats, widely used for motion sickness and vomiting. A licensed veterinarian sets the right dose — never a website.

What it is

Cerenia (maropitant) is a prescription anti-nausea and anti-vomiting medication for dogs and cats, widely used for motion sickness and vomiting.

What it is used for

Veterinarians prescribe it for vomiting, nausea, motion sickness. Whether it is right for your pet, and at what dose, is a decision your veterinarian makes.

How dosing works

The correct amount depends on your pet's weight, species, other medications, and health — which is why a licensed veterinarian sets it, not a website. Your veterinarian reviews your pet and sets the prescription and dose for your animal.

How it works

Nausea and vomiting are triggered when a signaling molecule called substance P binds to NK-1 receptors in the brain's vomiting center. Maropitant is an NK-1 receptor antagonist: it blocks those receptors, so the vomiting signal is interrupted whether the trigger is motion, another medication, or an upset stomach from illness. Because it acts centrally, it covers a broad range of causes rather than just one, which is part of why veterinarians reach for it so often.

What to expect

Dogs and cats given maropitant usually stop vomiting and settle within a few hours, and the effect lasts about a day. For motion sickness it is given ahead of travel; for illness it is part of a larger plan that also looks for and treats the underlying cause. Controlling the vomiting helps a pet keep down food, water, and other medicines, which supports recovery. It is supportive care, though, not a cure for whatever is causing the nausea, so your veterinarian will still want to find that cause.

Side effects and what to watch for

Most pets tolerate it well. With the injectable form, a brief sting at the injection site is common; some pets drool, seem a little tired, or eat less. Serious effects are uncommon. Because ongoing vomiting can signal a problem that needs its own treatment, tell your veterinarian if it continues, if your pet seems painful or lethargic, or if there is blood in the vomit. Your veterinarian will decide whether the vomiting needs further workup.

Before giving it: cautions

Whether maropitant is right, and the right amount, depends on your pet's age, weight, species, and what is causing the nausea, which is why a veterinarian sets it rather than a website. It is used carefully in very young animals and in pets with liver disease, and your veterinarian will want to know every other medication your pet takes. Masking vomiting without finding the cause can delay the correct diagnosis, so it is used as part of a workup, not instead of one.

Where it fits

Maropitant is a first-line anti-nausea medicine in many clinics because it is effective and well tolerated across a wide range of causes, from car sickness to the nausea that comes with kidney disease or chemotherapy. It is often paired with other treatments such as fluids, a bland diet, acid reducers, or medicine for the underlying illness. Your veterinarian will decide how it fits your pet's situation and when it should be combined with other care.

Frequently asked questions