# Cerenia Maropitant Anti-Nausea Dose: Motion Sickness Dosing Chart for Pets


## Key Takeaways

-   Cerenia (maropitant citrate) is a neurokinin-1 (NK1) receptor antagonist that effectively blocks Substance P, a key neurotransmitter in the vomiting reflex and nausea pathway, making it a true anti-nausea agent.
-   The standard oral dose for motion sickness in dogs and cats is 2 mg/kg, administered 1-2 hours prior to travel, with efficacy lasting for 24 hours.
-   While approved for vomiting prevention/treatment in dogs and cats, its use for motion sickness in cats is considered off-label in many regions, requiring veterinary prescription based on clinical judgment.
-   Maropitant's efficacy in reducing nausea behaviors and lowering arginine vasopressin (AVP) levels has been scientifically validated, distinguishing it from agents that primarily suppress vomiting.
-   Contraindications and precautions include caution with severe liver disease, young animals, and potential breed sensitivities (e.g., MDR1 mutation in collies), necessitating veterinary consultation for appropriate use.
-   In cases of severe vomiting (more than twice in 24 hours), inability to retain water, abdominal pain, or a distended abdomen, immediate veterinary attention is required, and home administration of medication should be avoided.

---

If your [dog](/knowledge/veterinary-medicine/clinical-methods/dog) or [cat](/knowledge/veterinary-medicine/clinical-methods/cat) suffers from motion sickness, you are likely looking for a reliable way to stop the drooling, lip-licking, and vomiting before the car ride begins. The most common veterinary prescription for this is Cerenia (maropitant citrate). The standard anti-nausea dose for dogs is 2 mg per kilogram (or 1 mg per pound) given orally once daily, ideally 1 to 2 hours before travel. For cats, the oral dose is also 2 mg per kilogram once daily, but it is used off-label for motion sickness in many regions. This article provides a clear dosing chart, explains how maropitant works, compares it to other antiemetics like ondansetron, and outlines when you must contact your veterinarian.

**Owner Triage Summary:** If your pet has vomited more than twice in 24 hours, cannot keep water down, shows signs of abdominal pain (praying posture, whining), or has a bloated, firm abdomen, do not give any medication at home. Go to an emergency veterinarian immediately. Cerenia is a prescription medication. You must obtain it from your veterinarian, who will confirm the correct dose for your pet's specific weight and health status.

---

## At a Glance: Maropitant Dosing and Comparison Table

This table offers a rapid clinical reference for the most common antiemetic and anti-nausea medications used in small animal practice. It is not a substitute for professional advice.

| Feature | Cerenia (Maropitant) | Ondansetron (Zofran) | Metoclopramide (Reglan) |
| :--- | :--- | :--- | :--- |
| **Drug Class** | Neurokinin-1 (NK1) receptor antagonist | 5-HT3 receptor antagonist | D2 dopamine receptor antagonist |
| **Primary Action** | Blocks Substance P in the brain and gut | Blocks serotonin in the gut and brain | Blocks dopamine; increases GI motility |
| **Labeled Use (Dogs)** | Prevention of vomiting due to motion sickness; prevention and treatment of vomiting from other causes | Not labeled for dogs (used off-label) | Not labeled for dogs (used off-label) |
| **Typical Oral Dose (Dogs)** | 2 mg/kg once daily (motion sickness: give 1-2 hours before travel) | 0.5 to 1 mg/kg every 12 to 24 hours | 0.2 to 0.5 mg/kg every 8 hours |
| **Typical Oral Dose (Cats)** | 2 mg/kg once daily (off-label for motion sickness) | 0.5 mg/kg every 12 to 24 hours | 0.2 to 0.4 mg/kg every 8 hours |
| **Onset of Action (Oral)** | ~2 hours | ~1 to 2 hours | ~30 to 60 minutes |
| **Duration of Action** | 24 hours | 6 to 12 hours | 4 to 8 hours |
| **Key Evidence Strength** | Strong for vomiting prevention; good for nausea [<a href="#ref-1">1</a>] | Strong for reducing nausea behaviours in vestibular disease [<a href="#ref-2">2</a>] | Weak for nausea control [<a href="#ref-1">1</a>] |
| **Common Side Effects** | Drooling, vomiting (at injection), lack of appetite | Sedation, diarrhea (or diarrhoea) | Restlessness, facial twitching, GI upset |

---

## Understanding Nausea and Vomiting in Pets

To understand how Cerenia works, it is first necessary to understand the difference between nausea and vomiting. Vomiting is a physical reflex that results in the forceful expulsion of stomach contents. Nausea is the subjective, unpleasant sensation of needing to vomit [<a href="#ref-1">1</a>]. We cannot ask a dog or cat if they feel nauseous. Instead, veterinarians rely on behavioural signs.

### Behavioural Signs of Nausea

Research has identified specific behaviours that correlate with nausea in dogs. In a 2017 study by Kenward et al., dogs were observed for nausea-like behaviours after being given a chemotherapy drug (cisplatin) that induces nausea and vomiting [<a href="#ref-1">1</a>]. The behaviours scored included:

- **Lip licking**
- **Excessive salivation (drooling)**
- **Vocalization (whining)**
- **Restlessness**
- **Lethargy or depression**
- **Yawning**

These signs often appear before vomiting occurs. In the study, the onset of nausea-like behaviour in untreated dogs occurred at approximately 3.5 hours after the nausea trigger, peaking at 4.75 hours [<a href="#ref-1">1</a>]. If you see these signs in your pet during a car ride, they are likely experiencing nausea, not just anxiety.

### The Role of Arginine Vasopressin (AVP)

Scientists have identified a biological marker for nausea: arginine vasopressin (AVP). This hormone is released from the brain during nausea in both humans and dogs. In the 2017 study, plasma samples were collected to measure AVP and cortisol levels [<a href="#ref-1">1</a>]. In a later 2022 study on vestibular disease, serum AVP concentration was shown to correlate with clinical signs of nausea in dogs [<a href="#ref-2">2</a>]. When a treatment successfully reduces nausea, AVP levels decrease [<a href="#ref-2">2</a>]. This provides an objective measure for researchers to evaluate anti-nausea drugs.

---

## What is Cerenia (Maropitant)?

Cerenia is the brand name for the active ingredient **maropitant citrate**. It is a neurokinin-1 (NK1) receptor antagonist. Its mechanism of action is unique among antiemetics. It works by blocking the action of **Substance P**, a neuropeptide involved in the transmission of pain and the vomiting reflex.

Substance P binds to NK1 receptors located in the vomiting centre of the brain (the area postrema and nucleus tractus solitarius) and in the gastrointestinal tract. By blocking these receptors, maropitant prevents the signals that trigger the vomiting reflex and, importantly, reduces the sensation of nausea [<a href="#ref-1">1</a>].

### Approved Uses

Maropitant is approved by regulatory bodies (such as the EMA in Europe and the FDA in the United States) for use in dogs for:

1.  **Prevention of acute vomiting** (e.g., due to dietary indiscretion, gastroenteritis, or chemotherapy).
2.  **Prevention of vomiting due to motion sickness**.
3.  **Treatment of vomiting** in combination with other supportive care.

In cats, maropitant is approved for the prevention and treatment of vomiting, but its use for motion sickness is considered **off-label** in many countries. Off-label use means the drug is not specifically tested and approved for that condition, but veterinarians are legally allowed to prescribe it based on their clinical judgment and evidence.

---

## The Science: How Effective is Maropitant for Nausea?

Historically, many antiemetics were effective at stopping vomiting but did little to relieve the feeling of nausea. This is a significant clinical problem, as nausea can cause a pet to refuse food and water, leading to dehydration and prolonged recovery.

A pivotal study by Kenward et al. (2017) directly compared the anti-nausea effects of maropitant, ondansetron, and metoclopramide in a dog model of nausea [<a href="#ref-1">1</a>]. The study used a low dose of cisplatin to induce a state of nausea and vomiting in beagle dogs.

**Key Findings from the Study:**

- **Vomiting Prevention:** Both maropitant (1 mg/kg IV) and ondansetron (0.5 mg/kg IV) completely prevented vomiting in all dogs during the 8-hour observation period. The placebo (untreated) group vomited an average of 7 times [<a href="#ref-1">1</a>].
- **Nausea Reduction:** This was the most critical finding. The study measured nausea behaviours over time. The placebo group showed a significant increase in nausea scores. **Both maropitant and ondansetron significantly reduced the nausea behaviour score compared to placebo** [<a href="#ref-1">1</a>].
- **Metoclopramide Performance:** Metoclopramide was less effective. While it may have had some effect on vomiting, it did not significantly reduce nausea-like behaviours in this model [<a href="#ref-1">1</a>].

**Conclusion:** This study provided strong evidence that maropitant is not just an antiemetic (stops vomiting) but is also a true **anti-nausea** medication. It targets the NK1 receptor, which is a key player in the brain's nausea pathway [<a href="#ref-1">1</a>].

### Maropitant vs. Ondansetron for Nausea

The 2017 study showed both maropitant and ondansetron are effective for nausea [<a href="#ref-1">1</a>]. However, they work on different pathways. Ondansetron is a 5-HT3 receptor antagonist, which primarily blocks serotonin signals in the gut and brain.

A 2022 study by Henze et al. focused specifically on ondansetron for nausea in dogs with vestibular syndrome (a condition affecting balance that often causes severe nausea) [<a href="#ref-2">2</a>]. This study confirmed that ondansetron (0.5 mg/kg IV) effectively reduced nausea behaviours and lowered AVP levels within 1 hour of administration [<a href="#ref-2">2</a>].

**Which is better?** It depends on the cause of the nausea.

- **Motion Sickness:** Maropitant is often preferred because it is long-acting (24 hours) and approved for this use. It also works in the brain where motion signals are processed.
- **Vestibular Disease (e.g., "old dog vestibular syndrome"):** Ondansetron showed excellent results in the 2022 study [<a href="#ref-2">2</a>]. Some neurologists prefer it for severe nausea associated with balance issues.
- **Chemotherapy-Induced Nausea:** Both have shown efficacy, but maropitant is often used prophylactically [<a href="#ref-1">1</a>].

Your veterinarian will choose the best drug based on the underlying cause, your pet's health, and the drug's specific mechanism of action.

---

## Cerenia (Maropitant) Dosing Chart for Motion Sickness

The following chart provides standard dosages. **Always confirm the exact dose and tablet strength with your prescribing veterinarian.** Cerenia tablets come in multiple strengths (e.g., 16 mg, 24 mg, 60 mg, 160 mg), and it is easy to make a calculation error.

### Canine Dosing Chart (Oral)

The standard label dose for motion sickness in dogs is **2 mg per kilogram (or 1 mg per pound)** of body weight, given once daily.

| Dog Weight (lbs) | Dog Weight (kg) | Approximate Dose (mg) | Typical Tablet Strength |
| :--- | :--- | :--- | :--- |
| 5 lbs | 2.3 kg | 4.5 mg | 16 mg tablet (give a portion) |
| 10 lbs | 4.5 kg | 9 mg | 16 mg tablet (give a portion) |
| 15 lbs | 6.8 kg | 13.6 mg | 16 mg tablet (give a portion) |
| 20 lbs | 9.1 kg | 18.2 mg | 24 mg tablet (give a portion) |
| 30 lbs | 13.6 kg | 27.2 mg | 24 mg or 60 mg tablet |
| 40 lbs | 18.2 kg | 36.4 mg | 60 mg tablet (give a portion) |
| 50 lbs | 22.7 kg | 45.4 mg | 60 mg tablet (give a portion) |
| 60 lbs | 27.3 kg | 54.6 mg | 60 mg tablet (give a portion) |
| 70 lbs | 31.8 kg | 63.6 mg | 60 mg or 160 mg tablet |
| 80 lbs | 36.4 kg | 72.8 mg | 160 mg tablet (give a portion) |
| 90 lbs | 40.9 kg | 81.8 mg | 160 mg tablet (give a portion) |
| 100+ lbs | 45.5+ kg | 91+ mg | 160 mg tablet (give a portion) |

**Important Instructions for Dogs:**

- **Timing:** Give the medication at least 1 to 2 hours before the car ride. This allows enough time for the drug to be absorbed and reach effective levels in the brain.
- **Food:** Cerenia can be given with or without food. However, if your dog has a sensitive stomach, giving it with a small meal may help prevent any mild gastrointestinal upset.
- **Duration:** For motion sickness, it is typically given on an "as-needed" basis for travel. For other conditions, it is given once daily for a specified duration as directed by your vet.
- **Tablet Splitting:** If you need to split a tablet, do so carefully. The tablets are scored for splitting in some cases, but not all. Ask your pharmacist or vet if splitting is appropriate for the specific formulation you have.

### Feline Dosing Chart (Oral)

The dose for cats is also **2 mg per kilogram** once daily. However, this is an off-label use for motion sickness, so your vet's specific instructions may vary.

| Cat Weight (lbs) | Cat Weight (kg) | Approximate Dose (mg) | Typical Tablet Strength |
| :--- | :--- | :--- | :--- |
| 5 lbs | 2.3 kg | 4.5 mg | 16 mg tablet (give a portion) |
| 8 lbs | 3.6 kg | 7.2 mg | 16 mg tablet (give a portion) |
| 10 lbs | 4.5 kg | 9 mg | 16 mg tablet (give a portion) |
| 12 lbs | 5.4 kg | 10.8 mg | 16 mg tablet (give a portion) |
| 15 lbs | 6.8 kg | 13.6 mg | 16 mg tablet (give a portion) |

**Important Instructions for Cats:**

- **Off-Label Use:** In the US and many other countries, Cerenia is not FDA-approved for motion sickness in cats. Your vet must prescribe it for this purpose. This is a common and accepted practice.
- **Pilling Difficulty:** Cats can be difficult to pill. You may need to hide the tablet in a pill pocket or a small amount of a highly palatable treat (like tuna or chicken baby food). Do not crush the tablet unless your vet advises it, as it tastes bitter.
- **Duration:** Similar to dogs, it is used for the duration of travel.

---

## How to Give Cerenia: A Step-by-Step Guide

1.  **Weigh Your Pet:** Use a digital scale for accuracy. Do not guess the weight, as an incorrect dose can be ineffective or, in rare cases, cause side effects.
2.  **Confirm the Dose:** Re-check the dose with your veterinarian. State the weight and the tablet strength you have. For example, "My dog is 23 kg, and I have the 60 mg tablets. How many milligrams should I give?"
3.  **Administer the Tablet:** Give the tablet directly or hidden in a small treat.
4.  **Monitor:** Watch for any signs of an adverse reaction, such as excessive drooling, vomiting, or facial swelling. These are rare but warrant a call to your vet.
5.  **Plan Ahead:** Set a reminder on your phone to give the medication 1 to 2 hours before you need to leave.

---

## Safety, Side Effects, and Contraindications

### Common Side Effects

Maropitant is generally very safe. The most common side effects reported include:

- **Drooling (Hypersalivation):** This is often due to the bitter taste of the tablet, especially in cats.
- **Vomiting:** Paradoxically, some pets may vomit shortly after receiving the oral dose, especially if they have an empty stomach.
- **Lethargy or Sedation:** Some pets may seem tired.
- **Loss of Appetite:** This is usually temporary.

### Contraindications and Precautions

- **Liver Disease:** Maropitant is metabolized by the liver. Use with caution in pets with severe liver dysfunction. Your vet may recommend blood work to check liver enzymes before prescribing.
- **Young Puppies and Kittens:** The safety of maropitant has not been fully established in very young animals (typically under 8 to 16 weeks of age, depending on the region and product labeling). Your vet will determine if the benefits outweigh the risks.
- **Pregnancy and Lactation:** The safety of maropitant in pregnant or nursing pets has not been established. It should only be used if the potential benefit clearly justifies the potential risk to the fetus or nursing offspring.
- **Breed Sensitivities:** Some collie breeds (e.g., Rough Collies, Border Collies) have a genetic mutation (MDR1) that makes them sensitive to certain drugs. Maropitant is a substrate for the P-glycoprotein efflux pump, which is affected by the MDR1 gene. While it is generally considered safe, pets with the MDR1 mutation may be at higher risk for neurological side effects. Discuss this with your vet if your dog is a herding breed.

### Overdose

If you accidentally give too much Cerenia, contact your veterinarian or an animal poison control center immediately. Signs of overdose may include severe lethargy, tremors, and ataxia (wobbliness).

---

## Beyond Motion Sickness: Other Clinical Uses

While this article focuses on motion sickness, it is helpful to know that maropitant is a versatile drug used for many other conditions:

- **Gastroenteritis:** It is often used to stop vomiting and reduce nausea in dogs with upset stomachs.
- **Pancreatitis:** It is a key part of managing the severe nausea and vomiting associated with this painful condition.
- **Chemotherapy:** It is given prophylactically to prevent the nausea and vomiting caused by chemotherapeutic drugs like cisplatin [<a href="#ref-1">1</a>].
- **Renal Disease:** It helps manage the nausea associated with kidney failure.
- **Post-Operative Nausea:** It can be used to prevent vomiting after surgery.

In all these cases, the dose is typically the same (2 mg/kg once daily), but the duration of treatment will vary based on the underlying condition.

---

## Regional Considerations for Pet Owners

- **United States & Canada:** Cerenia is available by prescription. Generic maropitant is also becoming available in some regions, which may be more cost-effective. Always ensure you are getting the correct formulation.
- **Europe (UK, EU):** Cerenia is also a prescription-only medicine (POM-V in the UK). The product labeling may differ slightly, but the active ingredient and dose are the same. The European Medicines Agency (EMA) has approved maropitant for use in dogs and cats.
- **Australia:** Cerenia is available by prescription from your veterinarian. It is registered for use in dogs and cats. Always follow the instructions on the label provided by your Australian vet.

---

## Unsafe Home Remedies and What to Avoid

It is critical to avoid giving your pet human anti-nausea medications without veterinary approval. Many are toxic.

- **Never give Ibuprofen, Aspirin, or Acetaminophen (Paracetamol):** These are not antiemetics and are highly toxic to pets.
- **Never give Human Motion Sickness Patches (Scopolamine):** These can cause severe side effects in pets, including disorientation, dilated pupils, and dangerously high heart rates.
- **Avoid "Rescue Remedy" or Essential Oils:** These are not proven to be effective and some essential oils are toxic to cats and dogs.
- **Do Not Induce Vomiting:** Unless specifically instructed by a veterinarian or poison control, do not try to make your pet vomit.

---

## Prevention and Management of Motion Sickness

Medication is only one part of managing motion sickness. Here are other strategies to help your pet:

- **Create a Positive Association:** Make the car a fun place. Take short, non-scary trips to the park or for a treat, so the car is not always associated with a negative experience (like going to the vet).
- **Use a Carrier or Harness:** Securing your pet in a well-ventilated carrier or with a crash-tested harness can reduce anxiety and physical swaying.
- **Ventilation:** Ensure the car is well-ventilated. Fresh air can help reduce nausea.
- **Limit Food and Water:** For some pets, an empty stomach is better. For others, a small, bland snack is helpful. Experiment to see what works best, but avoid a large meal right before travel.
- **Take Breaks:** On long trips, stop every 2 to 3 hours to let your pet stretch their legs, drink a little water, and relieve themselves.
- **Pheromone Therapy:** Products like Adaptil (for dogs) or Feliway (for cats) can help reduce anxiety, which may be a contributing factor to motion sickness.

---

## Limitations and When to Contact a Veterinarian

This article provides general dosing guidelines. It cannot predict how your individual pet will respond. Breed, age, genetics (like the MDR1 mutation), and concurrent health conditions can all influence the safety and efficacy of maropitant.

**Contact your veterinarian immediately if:**

- Your pet vomits after receiving the medication.
- Your pet shows signs of an allergic reaction (hives, facial swelling, difficulty breathing).
- Your pet becomes unusually lethargic or unresponsive.
- Your pet's motion sickness does not improve with the prescribed dose.
- Your pet is showing signs of severe illness that are not related to motion sickness, such as a painful abdomen, bloody vomit or diarrhea (diarrhoea), or a persistent fever.

**Emergency Red Flags (Go to the ER now):**

- A bloated, hard, or painful abdomen (could be Gastric Dilatation-Volvulus, a life-threatening emergency).
- Repeated, unproductive retching (dry heaving).
- Inability to stand or severe weakness.
- Seizures.

---

## Frequently Asked Questions

### 1. How long does it take for Cerenia to start working for motion sickness?
Cerenia should be given 1 to 2 hours before travel. It reaches peak effectiveness in the bloodstream approximately 2 hours after oral administration, and its effects last for a full 24 hours.

### 2. Can I give my dog Cerenia every day for motion sickness?
Yes, Cerenia is safe for daily use in dogs at the labeled dose of 2 mg/kg. It is often prescribed for a few days during long trips. For chronic daily use, your vet should monitor your dog's health, but it is generally well-tolerated.

### 3. Is Cerenia safe for cats?
Yes, Cerenia is approved for use in cats to prevent and treat vomiting. However, its use for motion sickness is considered off-label. Your veterinarian must prescribe it and will confirm the correct dose, which is typically 2 mg/kg once daily.

### 4. What is the difference between Cerenia and ondansetron?
Cerenia (maropitant) blocks Substance P (NK1 receptor), while ondansetron blocks serotonin (5-HT3 receptor). Both are effective anti-nausea drugs, but they work on different pathways [<a href="#ref-1">1</a>]. Cerenia is longer-acting (24 hours) and is the go-to for motion sickness. Ondansetron is often used for severe nausea associated with conditions like vestibular disease, where it has shown rapid efficacy [<a href="#ref-2">2</a>].

### 5. Can I use human motion sickness medication like Dramamine for my dog?
You should never give human medication without explicit veterinary approval. While some human antihistamines like diphenhydramine (Benadryl) are sometimes used for mild motion sickness, they are not as effective as Cerenia and can cause significant sedation or other side effects. Always consult your vet first.

### 6. What if my pet vomits up the Cerenia tablet?
If your pet vomits within 30 minutes of receiving the dose, the medication may not have been fully absorbed. Contact your veterinarian for advice. They may recommend an injectable form of Cerenia (given at the clinic) or an alternative medication.

### 7. Does Cerenia make dogs sleepy?
Yes, lethargy or sedation is a potential, though not the most common, side effect of Cerenia. Some pets may seem more tired than usual after taking it. This is usually mild and temporary.

### 8. Can I give Cerenia to my pregnant dog?
The safety of maropitant in pregnant or lactating animals has not been fully established. It should only be used if the veterinarian determines that the potential benefit to the mother clearly outweighs the potential risk to the developing fetuses or nursing puppies. Always discuss this with your vet.

---


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## Sources

<a id="ref-1"></a>[<a href="#ref-1">1</a>] [Anti-nausea effects and pharmacokinetics of ondansetron, maropitant and metoclopramide in a low-dose cisplatin model of nausea and vomiting in the dog: a blinded crossover study.](https://pubmed.ncbi.nlm.nih.gov/28814338/)

<a id="ref-2"></a>[<a href="#ref-2">2</a>] [Ondansetron in dogs with nausea associated with vestibular disease: A double-blinded, randomized placebo-controlled crossover study.](https://pubmed.ncbi.nlm.nih.gov/35906792/)

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