Tri-Heart Plus Chewables

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$22.99 to $39.99


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.


Prescription Drug Policy:

Prescriptions CAN NOT be shipped to North Carolina, Hawaii or Alaska at this time.

Prescription drugs can only be shipped upon receipt of an original prescription from a licensed veterinarian. FarmVet can accept an original prescription in one of the following ways:
  • The original prescription may be mailed to:
    1254 Old Hillsboro Rd, Franklin,TN 37069 
  • A licensed veterinarian may fax the Rx to 615-370-8502.
    The fax must originate from the veterinarian's office.
  • A licensed veterinarian can call & leave a voicemail with your prescription information with our pharmacy at 615-277-5602.

Prescriptions are non-refundable. Prescriptions are refillable if indicated by your vet, for up to one year from the original date. At the end of one year, prescriptions must be updated. Written prescriptions must include the veterinarian's license number, telephone number, and address. Federal law restricts the use of Rx drugs to use by, or on the order of a licensed veterinarian.


  • 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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