Heartgard for Cats



Heartgard for Cats is a once-a-month chewable heartworm preventative and dewormer used in cats and kittens.

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Heartgard for Cats Basics

Heartgard for Cats prevents feline heartworm disease in cats and kittens. The active ingredient in this product is ivermectin. Ivermectin kills heartworms in the larval stage. It also helps to eliminate intestinal parasites, such as hookworms. Ivermectin works by interfering with the nerve transmission of the immature heartworms and hookworms.

Heartgard for Cats requires a prescription from your veterinarian. It comes in flavored chewable tablets.

Heartgard for Cats Directions

Use as directed by your veterinarian, and follow all instructions printed on the prescription label. Give Heartgard once a month, year-round. Dosage is based on your cat’s weight. For cats weighing over 15 pounds, use a combination of 2 Heartgard tablets.

Store at room temperature, protected from light and moisture.

Dosage for Cats

  • 0 – 5 lbs (red box):  Give one tablet by mouth once every 30 days.
  • 5 – 15 lbs (purple box): Give one tablet by mouth once every 30 days.

Heartgard for Cats Warnings

Keep out of the reach of children and pets. Heartgard for Cats is not intended for human consumption. Use in cats only. Do not use this medication in kittens less than 6 weeks old. This medication should be given monthly. In the case of a missed dose, give it as soon as you remember. Do not give a double dose of this medication. If you notice any behavioral or physiological changes in your cat while administering this product, contact your veterinarian immediately.

If you have any additional questions regarding this product, please contact us at (877)220-6337. A member of our pharmacy staff will be happy to assist you!

Additional information

Weight Range

0-5lbs, 5-15lbs

Package Size

6 month

Any refills you have will remain on file, however if you don’t see them in your online account, don't worry!
During checkout, select the option that lets us know your refill is on file.