Tri-Heart Plus Chewables

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$21.99 to $37.99

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Tri-Heart Plus Chewable Tablets by Merck is an oral medication used to help prevent heartworms in dogs. Tri-Heart Plus contains the same ingredients (ivermectin and pyrantel) as the leading heartworm brands, but for a lower price. It’s tasty, too - over ninety percent of dogs like the taste. Tri-Heart Plus is available in three different sizes so you can get the appropriate dose for your individual dog.


  • Same active ingredients as Heartgard Plus: Ivermectin and Pyrantel
  • Over ninety percent of dogs like the taste
  • Easy to give
  • Monthly tablets provide protection against heartworms


Tri-Heart Plus must be administered monthly, preferably on the same date each month. It is recommend for use year round. If only used during mosquito season, the first dose should be given within 30 days of the dog's first exposure to mosquitoes. The last dose must be given within 30 days after the dog's last exposure to mosquitoes.

Give Tri-Heart in a way that encourages your dog to chew the tablet, rather than swallow it whole.


  • Your dog should be tested for an active heartworm infestation before beginning Tri-Heart Plus
  • Tri-Heart Plus has been shown to be generally safe in pregnant dogs and puppies older than six weeks of age
  • Always ensure your veterinarian knows all the other medications your dog is taking
  • Keep away from children and pets

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