Heartgard (Ivermectin) a dewormer is used for the prevention of heartworm disease in dogs and cats.

Heartgard (Ivermectin) is given once a month year round for the prevention of heartworm disease.

Consult your veterinarian for exact dosages for your pet and take exactly as directed.

Heartgard (Ivermectin) is given once a month year round for the prevention of heartworm disease.

The usual dose of Heartgard (Ivermectin) in dogs up to:

25 pounds is 68mcg/57mg
26-50 pounds is 136mcg/114mg
51-100 pounds is 272mcg/227mg

Dogs over 100 pounds are given a combination of tablets.

The usual dose of Heartgard (Ivermectin) in cats:

5 pounds or less is 55mcg
6-15 pounds is 165mcg

The chewable tablets should be chewed.

They are not meant to be swallowed whole.

For dogs that normally swallow treats whole, the tablet can be broken into pieces.

The side effects of Heartgard (Ivermectin) are rare at the recommended heartworm prevention dose.

Higher doses in dogs may cause tremors, dilated pupils, and loss of body weight or death.

Cats : agitation, loss of appetite, staggering, dilated pupils, tremors, blindness and disorientation.

Heartgard (Ivermectin) medication should not be used in animals allergic to it.

Contact your veterinarian or veterinary emergency room.

All dogs should be tested for existing heartworm infection before starting treatment with Heartgard (Ivermectin)which is not effective against adult D. immitis.

Infected dogs must be treated to remove adult heartworms and microfilariae before initiating a programme with Heartgard (Ivermectin).


If the animal is off Heartgard (Ivermectin) for 6 months or less, start the medication and test after 6 months since microfilaria, that take 6 months to mature, will result in a positive test result. Because humans can contract hookworm from animals, it is important to maintain good personal hygiene. It is also important to eliminate fleas on the pet and in the household and to not feed the pet rodents or uncooked meat or fish.

To prevent canine heartworm disease by eliminating the tissue stage of heartworm larvae for a month (30 days) after infection.

Heartgard (Ivermectin) is also used for the treatment and control of ascarids and hookworms.

Heartgard (Ivermectin) is also used for the control of hookworm in cats.

Contact your veterinarian for more information.

Store in a cool dry place.

Use with caution in Collies.

Heartworm testing should be performed prior to the start of prevention therapy.

To prevent reinfection, daily cleanup of stools is recommended.