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Heartgard (ivermectin) Chewables for Cats Rx

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Heartgard (ivermectin) Chewables for Cats


Why has my veterinarian prescribed Heartgard Chewables for Cats?

Ivermectin is an intestinal de-wormer and is prescribed as a preventative for heartworm. It is also prescribed to treat various types of mites.


How do I give Heartgard Chewables for Cats?

  • First, READ THE LABEL CAREFULLY.                       
  • Give Ivermectin to your pet as directed by your veterinarian. 
  • If Ivermectin is prescribed as a liquid measure the dose carefully. 
  • Try to give this medication at the same time each day. 
  • DO NOT give your pet more medicine than directed. 
  • DO NOT give your pet medicine more often than prescribed. 
  • Try not to miss giving any doses.


If I miss a dose, what do I do?

If you miss a dose, give it to your pet as soon as possible. If it is almost time for the next dose, skip the missed dose, then continue with the regular dosing schedule. Do not give your pet two doses at once.


How do I store Heartgard Chewables for Cats?

Keep this medicine out of reach of children.


Store this medicine at room temperature in a dry, cool place. Keep this medicine away from heat and direct sunlight.


Do not store this medicine in damp places, in the bathroom, or near the kitchen sink. This medication can break down when exposed to moisture or heat.


What are the potential side effects of Heartgard Chewables for Cats?

Use this medication with caution in collie or collie-cross breeds and observe them closely for adverse effects.


There are very few side effects when this medication is given at the usual dose.

Ivermectin may cause a shock-like reaction in dogs. If this occurs, notify your veterinarian.


Other side effects may occur. If you notice anything unusual, contact your veterinarian.


What about possible drug interactions?

Be sure to tell your veterinarian about any other medications you are giving to your pet.


It’s not uncommon for your veterinarian to prescribe two different medications, which may cause a drug interaction to occur. If this happens, your veterinarian may change the dose and/or monitor your pet more closely.


Contact your veterinarian if your pet experiences any unusual reactions when different medications are given together.



You can find a Client Information Sheet which provides a summary of information about Heartgard Chewables for Cats by following the link below:

Heartgard for Cats Client Information Sheet*


If you have questions or concerns about Heartgard for Cats, or conditions related to its use, contact your pet's veterinarian or pharmacist.


*This link opens in a new window.

You can find a package insert which provides more detailed information on Heartgard Chewables for Cats' indications, forms of administration, and side effects along with other clinical information by following the link below:

Heartgard for Cats Package Insert*


Heartgard for Cats' Package Insert does not take the place of instructions from your veterinarian. Talk to your veterinarian if you do not understand the information provided in this document or if you have questions about Heartgard Chewables for Cats.


*This link opens in a new window.


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MerialHeartgard (ivermectin) Chewables for Cats

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I always buy Heartgard to protect our cats...


from Marysville, CA, USA

Verified Buyer
Site Member

Comments about Merial Heartgard (ivermectin) Chewables for Cats:

Our 4 cats our indoor cats, but have access to "outside" on a screened deck (but mosquitoes can still get to them). �I feel secure in knowing that a monthly dose of Heargard for each will protect them from an incurable disease caused by the bite of an infected mosquito. �They can have their "outside time", and I know they will always be safe through my use of this product.

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