Please note : The following information is from the manufacturer.
We will add more information soon.
Heartgard (Merial), Heartgard Plus (Merial)
What is this medication used for
Heartgard is an anthelminthic (dewormer) used for the prevention
of heartworm disease in dogs and cats. Heartgard is also used for
the control of hookworm in cats. Combined with pyrantel pamoate
(Heartgard Plus), it also protects against hookworm and roundworm
Heartgard is available by prescription as unflavored tablets and
flavored chewable tablets. Heartgard Plus is available as flavored
How this medicine should be used
Heartgard is given once a month year round for the prevention of
heartworm disease. The usual dose of Heartgard in dogs up to 25
pounds is 68mcg, for 26-50 pounds is 136mcg and for 51-100 pounds
is 272mcg. Dogs over 100 pounds are given a combination of tablets.
The usual dose of Heartgard in cats 5 pounds or less is 55mcg and
for cats 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. As an
alternate to year round dosing, this medication can be given during
the mosquito season and for one month after the season ends.
What are the side effects
The side effects of Heartgard are rare at the recommended heartworm
prevention dose. Higher doses in dogs may cause tremors, dilated
pupils, and loss of body weight or death. Side effects in cats include
agitation, loss of appetite, staggering, dilated pupils, tremors,
blindness and disorientation.
What special precautions are there
This medication should not be used in animals allergic to it. Use
with caution in Collies. Heartworm testing should be performed prior
to the start of prevention therapy. If the animal is off Heartgard
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
reinfection, daily cleanup of stools is recommended.
In the event of an overdose
Contact your veterinarian or veterinary emergency room. Symptoms
of overdose may include vomiting, diarrhea, and incoordination in
dogs. The symptoms of overdose in cats may include disorientation,
tremors, incoordination, and blindness.
How should I store this medication
Keep this medication in the original box. Do not remove the tablet
from the wrapper until ready to give the medicine. Store this medicine
at room temperature. Keep this medication out of the reach of children
This information sheet is for educational purposes only and is
intended to be a supplement to, and not a substitute for, the expertise
and professional judgment of your veterinarian. The information
is NOT to be used for diagnosis or treatment of your pet. You should
always consult your own veterinarian for specific advice concerning
the treatment of your pet.
The information is not intended to cover all possible uses, directions,
precautions, warnings, allergic reactions, drug interactions or
adverse effects, nor should it be construed to indicate that use
of a particular drug is safe, appropriate or effective for your
pet. It is not a substitute for a veterinary exam, and it does not
replace the need for services provided by your veterinarian.
Note: Any trademarks are the property of their respective companies
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