Important notice: Due to inclement weather our call center is currently experiencing delays. Please leave a voicemail or send us an email and we will get back to you as soon as possible. We appreciate your business and sincerely apologize for any inconvenience this causes.

Heartgard Ivermectin/Pyrantel Pamoate and/or alternatives

Product / Manufacturer
Quantity / Price (USD)

Heartgard Plus (Blue) Small Dogs under 25lbs 68mcg/57mg

Marketed as Heartgard-30 Plus Blue in Canada Manufacturer: Merial Canada Inc. Source Country : Canada
Shipped from : Canada

Heartgard Plus (Green) Medium Dogs 26-50lbs 136mcg/114mg

Marketed as Heartgard-30 Plus Green in Canada Manufacturer: Merial Canada Inc. Source Country : Canada
Shipped from : Canada

Heartgard Plus (Brown) Large Dogs 51-100lbs 272mcg/227mg

Marketed as Heartgard-30 Plus Brown in Canada Manufacturer: Merial Canada Inc. Source Country : Canada
Shipped from : Canada

  • This item requires a prescription from your doctor

  • All trademarks and registered trademarks are the property of their respective owners.

  • Please note that the source country, shipping country and/or manufacture may vary depending on availability.

Description of Heartgard

Heartgard is an oral pet medication with the generic name Ivermectin. It is broad spectrum antiparasitic which belongs to anthelmintic class of drugs. Heartgard is available in the form of a chewable tablet. Heartgard for dogs is supplied in three strengths- Heartgard for dogs 68mcg, 136mcg, and 272mcg, while Heartgard for cats is supplied in two strengths- Heartgard for cats 55mcg and 165mcg. The drug is a prescription medication; you need to consult your veterinarian before you buy Heartgard online.

Indications & Dosage of Heartgard

Heartgard is used to prevent canine heartworm disease in dogs and prevent feline heartworm disease in cats. It also works to remove and control hookworms in cats. The medication is specifically prescribed to eliminate the tissue stage of heartworm larvae for a month after the infection. Heartgard is only indicated for use in dogs and cats aged 6 weeks or above.

Ivermectin, the active ingredient in the medication, binds itself to proteins secreted by worms that block the immune system of the host. With the defenses of worms rendered inactive, the white blood cells in the body work to kill the worms. Heartgard is also known to stimulate the excessive release of neurotransmitters in the parasite’s peripheral nervous system that is known to paralyze the parasite.

The dosage of Heartgard is different for dogs and cats and mainly depends on the weight of the animal. The medication is indicated to be given monthly. The recommended dose of Heartgard for dogs is:

  • For dogs weighing up to 25lb – one Heartgard chewable containing 68mcg Ivermectin
  • For dogs weighing 26 to 50lb - one Heartgard chewable containing 136mcg Ivermectin
  • For dogs weighing 51 to 100lb - one Heartgard chewable containing 272mcg Ivermectin

The recommended dose of Heartgard for cats is:

  • For cats weighing up to 5lb - one Heartgard chewable containing 55mcg Ivermectin
  • For cats weighing 5 to 15lb - one Heartgard chewable containing 165mcg Ivermectin

Side Effects & Interactions of Heartgard

Like all other pet medications, Heartgard may also cause side effects in cats and dogs. However, the side effects caused by this drug are different for cats and dogs. Dilated pupils, loss of weight and tremors are some of the common side effects in dogs caused by Heartgard. Loss of appetite, dilated pupils, staggering tremors, agitation, permanent blindness, and disorientation are some of the side effects caused by Heartgard in cats.

Heartgard may also cause side effects such as sluggish behavior, laziness, excessive whining or crying, prolonged sleep, severe cases of diarrhea or vomiting, mild to severe convulsions or seizures, or loss of interest in activities such as going out for walks. These side effects are generally seen in dogs. This is not a complete list of side effects. To know more about the side effects caused by Heartgard, refer to the information leaflet provided with the medication.

There are no reports of drug interactions with Heartgard. However, you must inform your veterinarian about every medicine you are giving to your cat or dog before you buy Heartgard.

Warnings & Precautions of Heartgard

You should not buy Heartgard if your dog or cat is allergic to any ingredient in it. The medication may cause dehydration, so give enough water to your cat or dog during treatment.

IMPORTANT DISCLAIMER: All medical content is supplied by a third party company who is independent from this web site. As such, this web site can not guarantee the reliability, accuracy, and /or medical efficacy of the information provided. In all circumstances, you should seek the advice of a health professional pertaining to drug, treatment and/or medical condition advice. Note that not all products are shipped by our contracted Canadian pharmacy. This website contracts with dispensaries around the world that ship products directly to our customers. Some of the jurisdiction include but are not limited to United Kingdom, Europe, Turkey, India, Canada, Vanuatu, Mauritius, and USA. The items within your order may be shipped from any one of these jurisdiction depending on the availability and cost of the products at the time you place your order. The products are sourced from these countries as well as others. Please note that the product appearance may vary from actual product received depending on availability. The content above has been supplied by a third party who is contracted to, and also independent from, this web site. This web site cannot guarantee the accuracy, reliability or medical efficacy of the content provided. It is suggested that you always seek the advice of a health professional for treatment, drug or medical condition advice.

Mailing Address:

(Through our main mailing hub)
Best Price Rx
3219 Yonge St
Suite 306
Toronto, ON, Canada
M4N 3S1

*Returns not accepted at this address.
Contact us for more information.

Phone Numbers:
Toll Free Phone: 1-888-487-4224 Toll Free Fax: 1-888-325-3149
Hours of Operation:

24 hours a day, 7 days a week