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Home » How Much Miralax to Give a Cat: Safe Dosage Guide

How Much Miralax to Give a Cat: Safe Dosage Guide

Posted on August 11, 2023 @

Last Updated on May 9, 2024 by Ian Dossary

If your cat is struggling with constipation, you may be wondering how much Miralax to give them. Miralax is a commonly used medication for cats with constipation, but it is crucial to administer it safely and in the correct dosage.

In this section, we will discuss the safe dosage of Miralax for cats and compare it to lactulose, another common medication for constipation. We will also address any potential risks or concerns associated with administering Miralax to cats.

Key Takeaways:

  • Miralax is a safe and effective medication for treating constipation in cats, but it must be administered in the correct dosage.
  • It is crucial to consult with your veterinarian before giving your cat any medication, including Miralax.
  • Miralax can be more effective than lactulose for treating severe or chronic constipation in cats.

Understanding Miralax and Lactulose for Cats

As a cat owner, you may have heard of Miralax and lactulose as treatments for cat constipation. Both medications work by drawing water into the colon, softening the stool and making it easier for your cat to pass.

Miralax, also known by its generic name polyethylene glycol, is a flavorless powder that can be mixed with food or water. It is commonly used in humans and has been approved by the FDA for use in cats. Lactulose, on the other hand, is a sweet-tasting liquid that can also be mixed with food or water. It is a synthetic sugar that is not absorbed in the intestine, which means it remains in the colon and draws water into the stool.

While both medications are effective in treating constipation, there are some differences to consider. Miralax may be a better option for cats who don’t like the taste of lactulose, while lactulose may be better suited for cats with liver disease, as it can help reduce the buildup of ammonia in the blood. Your veterinarian can help determine which medication is best for your cat’s specific needs.

Consult Your Veterinarian First

Before administering Miralax or any other medication to your cat, it is essential to consult with your veterinarian. Your vet can guide you on the appropriate dosage of Miralax for your cat, based on their specific needs and medical history. They can also advise you on any potential risks or side effects of using Miralax and recommend alternative treatments if necessary.

Determining the Correct Dosage of Miralax

When it comes to giving Miralax to your cat, it’s important to determine the correct dosage to ensure optimal effectiveness and safety. The appropriate dosage can vary depending on your cat’s weight, severity of constipation, and overall health conditions.

Cat’s WeightMiralax Dosage
less than 10 pounds1/8 to 1/4 teaspoon once a day
10 to 20 pounds1/4 to 1/2 teaspoon once a day
over 20 pounds1/2 to 3/4 teaspoon once a day

It’s important to note that these are general guidelines, and you should always consult with your veterinarian before administering any medication to your cat. Based on your cat’s individual needs and medical history, your veterinarian may recommend a different dosage or frequency of Miralax.

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It’s also important to follow your veterinarian’s instructions regarding the duration of treatment. Miralax is not a long-term solution for constipation, and using it excessively may lead to other health issues.

Administering Miralax to Your Cat

Administering Miralax to your cat may seem like a daunting task, but with the right method and approach, it can be done smoothly. When giving any medication to your cat, it’s important to ensure that they take the correct dosage and that it is done safely and effectively.

Mixing with Food or Water

One of the most common ways to administer Miralax to your cat is by mixing it with their food or water. This method has the advantage of being easy and convenient. To do this, simply measure out the correct dosage of Miralax and mix it thoroughly with your cat’s food or water. Ensure that your cat consumes the entire mixture to ensure they receive the correct dose.

Using a Syringe

Another method to administer Miralax to your cat is by using a syringe. This method is generally used for cats that have difficulty taking medication with their food or water. To administer Miralax with a syringe, measure the correct dosage and mix it with a small amount of water to form a paste. Use the syringe to place the paste in your cat’s mouth slowly. Give them time to swallow before administering another dose.

It’s important to note that you should never force your cat to take medication or shove it down their throat. Doing so could result in injury or cause your cat to become fearful of future medication administration.

How Often to Give Miralax to Your Cat

The frequency of administering Miralax to your cat will depend on several factors, including the severity of their constipation and their response to the medication. Generally, Miralax can be given once a day until your cat’s bowel movements return to normal. Your veterinarian may recommend a different dosage or frequency based on your cat’s specific needs.

If you are unsure about the proper dosage or administration method for your cat, consult your veterinarian. They can provide personalized guidance and ensure that your cat receives the appropriate treatment.

Potential Risks and Side Effects

While Miralax is generally considered safe for cats, there are potential risks and side effects to be aware of.

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Potential RisksSymptoms to Watch For
DehydrationExcessive thirst, dry mouth, lethargy
Electrolyte ImbalanceWeakness, muscle tremors, seizures
Allergic ReactionHives, difficulty breathing, swelling

If you notice any of these symptoms or any other concerning changes in your cat’s behavior after administering Miralax, it’s important to contact your veterinarian immediately. They can assess your cat and determine the appropriate course of action.

It’s also important to note that Miralax should not be administered to cats with known allergies to polyethylene glycol (PEG) or any other ingredients in the medication.

Overall, while Miralax is generally considered safe and effective for cats, it’s important to monitor your cat for any potential side effects and seek veterinary assistance if needed.

Miralax vs Lactulose: Which Is Better for Cats?

When it comes to treating cat constipation, Miralax and lactulose are two commonly used medications. Each medication has its pros and cons, which may make one more suitable than the other for your cat’s needs.

Miralax for Cats

Miralax, also known as polyethylene glycol 3350, is a laxative that works by drawing water into the colon to soften the stool. It is typically administered orally in a powder form mixed in food or water. The maximum recommended dose of Miralax for cats is 1/8 to 1/4 teaspoon per day, depending on your cat’s weight and severity of constipation.

Lactulose for Cats

Lactulose is a laxative that works by increasing the amount of water and stool in the intestines. It also promotes the growth of beneficial bacteria in the colon. Lactulose is typically administered orally in a liquid form directly into the mouth or mixed in food or water. The recommended dose of lactulose for cats is 1-2 milliliters per day, depending on your cat’s weight and severity of constipation.

Pros and Cons

MiralaxEffective at softening stool and relieving constipationMay take longer to work than lactulose
LactuloseCan help improve colon health by promoting the growth of beneficial bacteriaMay cause abdominal discomfort and bloating

In conclusion, both Miralax and lactulose can be effective in treating cat constipation. The choice between the two medications depends on your cat’s individual needs and preferences. Consulting with your veterinarian can help you determine the best medication and dosage for your cat’s constipation.

Where to Buy Miralax for Cats

If you have decided to use Miralax for your cat’s constipation, you may be wondering where to purchase it. There are several options available for buying Miralax, including:

  • Online retailers such as Amazon, Chewy, and Petco
  • Local pet stores such as PetSmart and Pet Supplies Plus
  • Veterinary clinics and pharmacies
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When purchasing Miralax online, make sure to select a reputable seller and check the expiration date of the product. You may also be able to find discounts or coupons to save money on your purchase.

If you choose to buy Miralax in-store, check with the staff to ensure they carry the product and the specific dosage you need. Some stores may only carry a certain strength or type of Miralax.

Regardless of where you choose to buy Miralax, always follow the dosage instructions provided by your veterinarian and monitor your cat’s condition closely. If you have any questions or concerns, don’t hesitate to contact your veterinarian for guidance.

Tips for Preventing Cat Constipation

Preventing cat constipation is a crucial part of maintaining your cat’s digestive health. Here are some tips to help reduce the likelihood of constipation:

  • Provide plenty of fresh water to help keep your cat hydrated.
  • Incorporate wet food into your cat’s diet, as it can help prevent constipation and promote digestion.
  • Ensure your cat has adequate exercise and playtime to help keep their digestive system functioning properly.
  • Consider adding a fiber supplement to your cat’s diet, such as canned pumpkin or psyllium husk.
  • Monitor your cat’s litter box habits, as constipation can be caused or worsened by stress or a dirty litter box.

By implementing these preventive measures, you can help maintain your cat’s digestive health and reduce the need for medications such as Miralax.

Monitoring Your Cat’s Progress

After administering Miralax to your cat, it’s essential to monitor their progress to ensure the medication is working effectively. Here are some tips to help you keep track of your cat’s response:

  • Observe your cat’s bowel movements and note any changes. Ideally, your cat should pass stool at least once a day. However, depending on the severity of the constipation, it may take a few days for the Miralax to take effect.
  • If you notice your cat straining or showing signs of discomfort while using the litter box, it may be a sign that the Miralax dosage needs adjusting. Consult your veterinarian for further guidance.
  • Keep an eye on your cat’s appetite and water intake. If your cat’s constipation is severe, they may lose their appetite or become dehydrated. These are signs that you need to contact your veterinarian immediately.
  • It’s essential to follow the recommended dosage and not exceed it. Giving your cat too much Miralax can lead to other health issues.

If, after a few days, you notice no improvements in your cat’s bowel movements or constipation symptoms, consult your veterinarian. They may need to recommend a different treatment plan or adjust the Miralax dosage.


Cat constipation can be addressed using Miralax, but always consult your veterinarian before giving any medication. While both Miralax and lactulose can treat constipation, Miralax is often preferred for its safety and ease of use.

Follow dosage instructions and monitor your cat closely. To prevent constipation, ensure your cat gets enough water, a proper diet, and exercise. Prioritize your cat’s digestive health and consult a vet as needed.