1 MONTH Heartgard for Cats 5 to 15 lbs

List Price: $10.99
Sale Price: $7.83
Code: heartcat-single
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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.


Cats (6+ weeks of age, no weight requirement)


  • Highly effective in preventing heartworms
  • Removes and controls adult and immature hookworms
  • A convenient and tasty chewable for easy administration
  • Delicious beef flavor that most cats will eat

How it works:

Heartgard Chewables for Cats prevent heartworm disease by eliminating the tissue stage of heartworm larvae for a month after infection.


Store at controlled room temperature 68-77°F (20-25°C).

Do not remove the chew from its wrapper until ready to give. Heartgard Chewables for Cats must be chewed. They should not be swallowed whole. For cats, the chew can be crumbled onto food or fed directly to the cat. Do not give a double dose of the medication.
  • Heartgard Chewables for Cats are once-a-month chewable tablets available by prescription for the prevention of heartworm disease.
  • It is recommended by the American Heartworm Society that heartworm prevention be given year-round.
Weight range (lbs) Weight range (kg) Dosage
Under 5lbs 2.3kg 1 chewable tablet (red box) once a month
5-15lbs 2.3-6.8kg 1 tablet (purple box) once a month
Heartgard Red Chewables (for Cats 1-5 lbs):
Active Ingredient Amount
Ivermectin 55 mcg

Heartgard Purple Chewables (for Cats 5-15 lbs):
Active Ingredient Amount
Ivermectin 165 mcg


  • Keep out of reach of children and pets.
  • It is important that you give your pet this preventative every month.
  • If you miss than two monthly doses, we recommend calling your vet before continuing the medication.
  • Also, note that side effects are rare at the recommended heartworm prevention dose.
  • Side effects in cats include agitation, loss of appetite, staggering, dilated pupils, tremors, blindness and disorientation.

Possible side effects:

Adverse reactions and serious side effects are rare, however, they can occur. In the case of a more serious side reaction, seek immediate veterinary attention. Serious reactions include vomiting, depression/lethargy, diarrhea, shaking, seizures, uncontrollable body movements, or unusual salivation.