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Heartgard for Cats (Rx)

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Product Description

Heartgard for Cats 1-5 lbs, 6 Month (Red) is a monthly cat medicine that prevents heartworm infestations and heartworm disease in cats. The ivermectin in this heartworm medicine for cats is a broad-spectrum antiparasitic that kills heartworm larvae in the tissue stage.

This heartworm meds by Merial Limited prevents feline heartworm disease in cats weighing 1- 5 lbs.

Buy this pet prescription medication as well as other prescription drugs for pets from our online pet pharmacy based in Texas. Buy pet medicine online and get veterinary medicines delivered at your doorstep.





  • Prevents infection by heartworms and feline heartworm disease
  • Kills heartworm larvae in the tissue stage
  • Offers month-long protection against heartworm disease in cats


Federal (U.S.A.) law restricts this cat medicine to use by or on the order of a licensed veterinarian.


For use in cats to prevent feline heartworm disease by eliminating the tissue stage of heartworm larvae (Dirofilaria immitis) for a month (30 days) after infection, and for the removal and control of adult and immature hookworms (Ancylostoma tubaeforme and A. braziliense).


HEARTGARD for Cats should be administered orally at monthly intervals at the recommended minimum dose level of 24 mcg of ivermectin per kg (10.9 mcg/lb) of body weight. The recommended dosage schedule for prevention of feline heartworm disease and control of hookworm is as follows:

Cat Weight lbHEARTGARD for Cats Chewables per monthIvermectin content
Up to 5 lb155 mcg
5 to 15 lb1165 mcg

For cats over 15 lb, use the appropriate combination of chewables.

HEARTGARD for Cats is recommended for use in cats 6 weeks of age and older.


Remove only one chewable at a time from the foil-backed blister card. Return the card with the remaining chewables to its box to protect the product from light. HEARTGARD for Cats can be offered to the cat by hand or may be added to a small amount of cat food. If manual dosing is required, the chewable should be broken into pieces for administration. Food should be routinely available during the day of treatment administration. If cats are fasted, or if the chewable is not broken into pieces for manual dosing of this cat medicine, then reduced absorption may result. A relationship between reduced absorption and reduced efficacy has not been established.

Care should be taken to see that the cat consumes the complete dose. Treated animals with this medicine for cats should be observed for a few minutes after administration to ensure that part of the dose is not lost or rejected. If it is suspected that any of the doses has been lost, redosing with a new chewable is recommended. Fragments of chewables have occasionally been observed in the feces of some cats; efficacy of the product was not adversely affected.

HEARTGARD for Cats to treat feline heartworm disease should be given at monthly intervals when mosquitoes potentially carrying infective heartworm larvae are active. The initial dose must be given within a month (30 days) after the cat’s first exposure to mosquitoes. The final dose must be given within a month (30 days) after the cat’s last exposure to mosquitoes. For optimal performance, HEARTGARD for Cats must be given once a month on or about the same date. If treatment is delayed, whether by a few days or many, immediate treatment with this cat heartworm preventive medicine and resumption of the recommended dosing regimen will minimize the opportunity for development of adult heartworm.

It is recommended that cats should be tested for existing heartworm infection prior to starting treatment with HEARTGARD for Cats. Cats already infected with adult heartworms can be given HEARTGARD chewables for cats monthly to prevent further infections.

Monthly treatment with HEARTGARD for Cats also provides effective removal and control of adult and immature hookworms.


In the clinical studies involving more than 3000 doses of HEARTGARD for Cats, observations reported within 24 hours of treatment included vomition in ≤ 0.3% and diarrhea in ≤ 0.2% of the doses administered. There were no statistical differences between HEARTGARD for Cats and the product vehicle (control) for these observations.

A wide margin of safety was demonstrated in clinical trials at the recommended dose level in cats and kittens 6 weeks of age and older and in laboratory studies in cats with circulating microfilariae of D. immitis. A wide margin of safety has also been demonstrated at 3 times the recommended dose in pregnant or breeding queens and breeding toms. No adverse effects of this cat medicine were observed in either male or female cats or their offspring in breeding studies. A 30-fold safety margin over the minimum recommended dosage was established in a single dose tolerance study. In growing kittens dosed monthly for 8 consecutive doses, one cat given 5 times the market dose vomited and a second cat in this group experienced diarrhea within 24 hours of the initial treatment. In clinical trials, many commonly used flea control products, anthelmintic, vaccines, antibiotics and steroid preparations were administered with HEARTGARD for Cats without incident.

Keep this and all pet medications out of the reach of children.

In case of ingestion of this cat medicine by humans, clients should be advised to contact a physician immediately.


HEARTGARD Chewables for Cats are stable for 3 years when stored below 77°F (25°C) and protected from light. Store this heartworm meds at controlled room temperature of 68°F-77°F (20°C-25°C). Excursions between 59°F-86°F (15°C-30°C) are permitted.


HEARTGARD for Cats heartworm medicine is available in two dosage strengths (see DOSAGE section) for cats of different weights. Each cat medicine strengths comes in a convenient carton of 6 chewables, packed 10 cartons per tray.

®HEARTGARD and the Cat & Hand logo are registered trademarks of Merial.

For customer assistance, please contact Merial at 1-888-637-4251.

Marketed by Merial Limited, 3239 Satellite Blvd., Duluth, GA 30096

Made in USA

Merial Limited, a company limited in shares registered in England and Wales (registered number 3332751) with a registered office at PO Box 327, Sandringham House, Sandringham Avenue, Harlow Business Park, Harlow, Essex CM19 5QA, England, and domesticated in Delaware, USA as Merial LLC.

NADA 141-078, Approved by the FDA.

©2010 Merial. All Rights Reserved.

Rev. 04-2010


NAC No.:


Additional Information

Bottle Size

1-5 lbs, 6 pk, 5-15 lbs, 6 pk

Product Type

Nutrition Medicine, OTC Medicine, Rx Medicine


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