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Monthly heartworm prevention in a chewable tablet.
  • Prevents heartworm disease
  • Treats and controls roundworms
  • Treats and controls hookworms
  • Treats and controls tapeworms
  • Pork liver flavor chewable
  • For dogs only

    Iverhart Max

    Q & A
    Starts at $32.49 Ships in one business day or less
    1_Select a Weight

      Product Info   How to use   Ingredients   Customer Reviews   Q & A  

    What is Iverhart Max?

    Iverhart Max prevents canine heartworm disease. It also treats and controls roundworms, hookworms, and tapeworms. Iverhart Max requires a prescription from your veterinarian.
    For: Dogs (8 weeks of age and weighing at least 6 lbs)
    Tasty chewable tablets (pork liver cereal based with artificial beef)
    Easy to administer
    Given once a month

    How it works:
    Iverhart Max is an anthelminthic (dewormer). The ingredient pyrantel pamoate is used to treat and control roundworms and hookworms in dogs. Praziquantel is used for treating and controlling tapeworms.

    Studies have indicated that certain dogs of the herding breeds are more sensitive to the effects of ivermectin administered at elevated dose levels due to the MDR1 gene. For a full list of dog breeds that may be affected, click here.

    Can cause sensitivities in herding dog breeds. Side effects of Iverhart Max are rare, but may include lethargy, limpness, salivation, shaking, diarrhea, decreased appetite, licking lips, and belching. Do not give Iverhart Max to your pet if already giving a different heartworm medication. The safe use of this drug has not been evaluated in pregnant or lactating bitches.

    More Information:
    Brand Name
    Iverhart Max (Virbac)
    Generic Name
    Ivermectin/Pyrantel Pamoate/Praziquantel (eye-ver-mekí-tin pie-raní-tell pamí-oh-ate prah-zee-kwaní-tell)

    What is the most important information I should know about Iverhart Max: Iverhart Max is a prescription medication available as chewable tablets in four strengths for dogs of different weights. Iverhart Max is packaged in boxes of 6 tablets and 12 tablets each tablet individually foil wrapped. It is important for the pet to consume the entire tablet. Iverhart Max should be used in dogs at least 8 weeks of age and no weight requirements. Iverhart Max is for use in dogs only.

    What is Iverhart Max: Ivermectin is an anthelminthic (dewormer) used for the prevention of heartworm disease in dogs. Pyrantel pamoate is used for treating and controlling roundworms and hookworms in dogs. Praziquantel is used for treating and controlling tapeworms. It is recommended that heartworm prevention is used year round.

    What should I discuss with my veterinarian before giving Iverhart Max to my pet: Tell your veterinarian if your pet has ever had an allergic reaction to the medication or any of it's individual ingredients.

    How should this medication be given: Use with caution, Collies and other herding dog breeds have been known to have adverse reactions to invermectin administered at elevated dose levels. Give Iverhart Max exactly as directed by the veterinarian. If you do not understand the directions ask the pharmacist or veterinarian to explain them to you. The usual dose of Iverhart Max in toy dogs 6 to 12 pounds is 34mcg/28.5mg/28.5mg (Magenta), for small dogs 12.1 to 25 pounds is 68mcg/57mg/57mg (Blue), for medium dogs 25.1 to 50 pounds is 136mcg/114mg/114mg (Green) and for large dogs 50.1 to 100 pounds is 272mcg/228mg/228mg (Brown). For dogs over 100 pounds the appropriate combination of strengths is used. Remove only one tablet at a time from the foil backed blister card. Iverhart Max can be given as a treat by hand or mixed with a small amount of food. Store the remainder in the original box they came in to protect from light. Store Iverhart Max at room temperature. Keep this medication out of the reach of children and pets. In addition, the safe use of this drug has not been evaluated in pregnant or lactating bitches.

    What happens if I miss giving a dose:Give the missed dose as soon as you remember. Do not give a double dose of the medication.

    What happens if I overdose the pet: Seek emergency veterinary medical treatment. Symptoms of overdose may include vomiting, diarrhea and incoordination.

    What should I avoid while giving Iverhart Max to my pet: If the dog has not taken heartworm preventative for 6 months or less, start the medication and test for heartworms after 6 months since microfilaria, that take 6 months to mature, will result in a positive heartworm test result. Because humans can contract hookworm and tapeworm 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. To prevent reinfection, daily cleanup of stools is recommended.

    What are the possible side effects of Iverhart Max: Side effects of Iverhart Max are rare but may include lethargy, limpness, salivation, shaking, diarrhea, decreased appetite, licking lips and belching.

    What other drugs will affect Iverhart Max: Do not give Iverhart Max to your pet if already taking an alternate heartworm medication.

    Where can I get more information: Your pharmacist has additional information about Iverhart Max written for health professionals that you may read.


    Give Iverhart Max Flavored Chewables once a month on the same day of each month year round.
    Iverhart Max Flavored Chewables can be given by hand, mixed intact with a small amount of food, or placed in the back of the dog’s mouth for forced swallowing.
    Watch dog closely following dosing to be sure the entire dose has been swallowed. If it is not completely swallowed, give one more full recommended dose as soon as possible.
    Tip: Do not remove chewable from its wrapper until ready to give to pet.
    Pet Weight Dosage
    Dogs/Puppies (8 weeks of age and older): 6 - 12 lbs Give 1 chewable every month (Magenta Box)
      12.1 - 25 lbs Give 1 chewable every month (Blue Box)
      25.1 – 50 lbs Give 1 chewable every month (Green Box)
      50.1-100 lbs Give 1 chewable every month (Brown Box)
      Over 100 lbs Give combination of chewables based on weight
    Storage: Should be stored at room temperature.
    Iverhart Max– Magenta Box (Dogs 6-12 lbs):
    Active Ingredients (per chewable tablet) Amount
    Ivermectin 34 mcg
    Pyrantel Pamoate 28.5 mg
    Praziquantel 28.5 mg

    Iverhart Max– Blue Box (Dogs 12.1-25 lbs):
    Active Ingredients (per chewable tablet) Amount
    Ivermectin 68 mcg
    Pyrantel Pamoate 57 mg
    Praziquantel 57 mg

    Iverhart Max – Green Box (Dogs 25.1-50 lbs):
    Active Ingredients (per chewable tablet) Amount
    Ivermectin 136 mcg
    Pyrantel Pamoate 114 mg
    Praziquantel 114 mg

    Iverhart Max – Brown Box (Dogs 50.1-100 lbs):
    Active Ingredients (per chewable tablet) Amount
    Ivermectin 272 mcg
    Pyrantel Pamoate 228 mg
    Praziquantel 228 mg

    Iverhart Max 4.3 5 196 196
    Easy and it Works My dog never gives me an issue when trying to give her Iverhart Max. Once a month and done. I visited the vet for her yearly (first year) checkup and she said all is great, no issues. As far as price, it's better than my vet could offer, so I will continue to purchase through 1-800-PetMeds 04/24/2014
    Iverhart Max Iverhart Max product review: As I also mention under my product review for Iverhart plus, it is truly wonderful for me to see a reliable more economic generic available for animal guardians that is certainly comparable to the more expensive brand name monthly heartworm preventatives. With this Virbac product, not only are clients getting the reliable heartworm prevention record of ivermectin, but also the additional preventative benefits and control of other internal parasites of the digestive tract, including roundworms, hookworms, and in this case tapeworms as well. It is exciting to see the inclusion of praziquantel in this combination product to broaden the spectrum of coverage of Iverhart plus against tapeworms. Tapeworms are among the most common frustrating parasites seen in dogs and cats, especially when there is any risk of flea exposure. Iverhart Max stands alone in having this added benefit of tapeworm control. Even for only this additional benefit, as well as the ones I mention under Iverhart plus , I highly recommend this reliable generic product and alternative to the other more expensive monthly heartworm pills that dont offer this protection against tapeworms. The only negative issue I have seen is the occasional pet who develops digestive upset from one of the ingredients, in which case I would change to a different monthly alternative. The only other possible limitation with this product is that it does not protect or prevent against whipworms, which in certain areas of the United States can be an intestinal parasite that can sometimes cause acute or chronic inflammation of the colon and diarrhea. But in my experience, whipworms are not as common as I used to see in my earlier days of veterinary practice. Thus my overall rating of this product is a 5. Its effectiveness a 4 and its taste a 4 as well. 12/01/2008
    Worm treatment 4 all dogs THIS PRODUCT IS GRrrrrr8, I love to use this heart guard treatment on my 70 Lb mixed breed 5 yr old dog!! I highly recommend this for everyone whom has a dog or puppy no matter what there size is to use this product. they will not be let down... IT works very very good!! Mary Heather Holcher !! 07/14/2008
    lower price I have been using Iverhart Max for the past year for our 3 retired Greyhounds and I love it! The dogs also eat it up!! 01/04/2015
    My Labs love the Iverhart Max, they eat them right from my hand and Petmeds service is great! 01/02/2015
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    124 Questions · 164 Answers

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    0 answers

    Need extra?

    I have a 165 lb Great Dane. I believe that my vet was prescribing the 100lb tablet in addition to a smaller tablet to compensate for her large size. Should I continue doing that, or will one or the large tablets work fine?

    I am not sure if it matters, but she used to have heartworms, but she was treated and has now been heartworm free for almost 2 years.
    2 weeks, 2 days ago
    Answer this question
    1 month, 3 weeks ago
    Answer this question


    It is not usually recommended to alternate heartworm preventatives each month. Please discuss this with your veterinarian. You can also consider using seasonal deworming medications in addition to a monthly heartworm prevention.
    1 month, 2 weeks ago
    Kelly P
    Vote as Best Answer
    Thanks for Voting
    I have a 5 month old puppy who is about 35 lbs. now, but he is growing fast and will probably be around 60 lbs within the next 6 months. I'd like to buy a 6-pack. What size should I buy? Would it be harmful for him to take a slightly larger dose?
    2 months, 2 weeks ago
    Answer this question


    We do carry HEARTGARD PLUS and IVERHART PLUS in single size doses. This is very helpful during the growing stage of a puppy. For instance, you can purchase 1 or 2 month supply of the
    25 though 50 lb size. After that you can reweight the puppy and take it from there.
    2 months, 2 weeks ago
    Linda M 1800petmeds pharmacist
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    Thanks for Voting
    2 months, 2 weeks ago
    Arkansas & Missouri
    Answer this question


    It reallydepends on where you live and if mosquitos are present where you live year round.
    Veterinarians usually make their decision based on this and also your dogs history.
    2 months, 2 weeks ago
    Kelly P
    Vote as Best Answer
    Thanks for Voting
    I gave my Cairn Terrier Iverhart Max today in a Pill Pocket (he refuses to chew these hard monstrosities). I have observed lethargy in him on a previous month but I had been giving him K9 Advantix on the same day, so I tried spacing those out by a week to make sure he wasn't reacting to the Advantix. He was really restless and a little gassy this evening, about four hours after I gave him the pill. When I took him out, he had two BMs and came in with a reddish orange stain on his fur. I wiped his rear and it appears to be blood but he is not bleeding from his anal glands as far as I can tell. He does not appear to be in pain or lethargic. He's alert and interested in everything I do and otherwise acting normal. I will observe his BM in the morning to see if he needs to go to the vet.
    3 months, 3 weeks ago
    Answer this question


    It's me again. Nikki's stiool did not have an orange tint today, and when I wiped him, the wipe did not have any orange or red on it, so he appears to be alright. He's not gassy or restless, either. I'm glad he's alright, but I'm going to watch for similar reactions next month, if I don't talk to his vet first.
    3 months, 3 weeks ago
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    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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