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Iverhart Max

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2. We verify your prescription and ship your order!
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Product Info
How to Use
Customer Reviews
Product Info

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.


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 does Iverhart Max work?

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.

Brand Name:

Iverhart Max (Virbac)

Generic Name:

Ivermectin/Pyrantel Pamoate/Praziquantel (eye-ver-mek-tin / pie-ran-tell pam-oh-ate / prah-zee-kwan-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 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 Iverhart Max be given?

Use with caution, Collies and other herding dog breeds have been known to have adverse reactions to ivermectin 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 of Iverhart Max?

Give the missed dose as soon as you remember. Do not give a double dose of the medication.

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.

How to Use
  • 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.

Do not remove chewable from its wrapper until ready to give to pet.

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
Do not use!
Do not use!

Should be stored at room temperature.

Iverhart Max- Magenta Box (Dogs 6-12 lbs):
Active Ingredients (per chewable tablet)
34 mcg
Pyrantel Pamoate
28.5 mg
28.5 mg
Iverhart Max- Blue Box (Dogs 12.1-25 lbs):
Active Ingredients (per chewable tablet)
68 mcg
Pyrantel Pamoate
57 mg
57 mg
Iverhart Max - Green Box (Dogs 25.1-50 lbs):
Active Ingredients (per chewable tablet)
136 mcg
Pyrantel Pamoate
114 mg
114 mg
Iverhart Max - Brown Box (Dogs 50.1-100 lbs):
Active Ingredients (per chewable tablet)
272 mcg
Pyrantel Pamoate
228 mg
228 mg
Customer Reviews
Iverhart Max is rated 4.3 out of 5 by 221.
Rated 1 out of 5 by from Did not work I switched to this product from Heartgard Plus. Had never had any issues with parasites before. In the four months that my dog was on this product, she became infested with hookworms, which this product claims to prevent. She is now being treated for that. She has lost weight and been sick because I trusted a product that failed us. Also, this is not an easy one to give. It is in pill form so had to be hidden in something like peanut butter to get her to take.
Date published: 2015-12-03
Rated 5 out of 5 by from Very effective and reasonably priced Our last several dogs have all used this medication. We have never had any problems while using it and now that we are associated with 1-800-PetMeds it will be easier than ever to get our medications. They contacted our vet and our order was here in no time. Thanks PetMeds...!!!
Date published: 2015-10-23
Rated 5 out of 5 by from Good product My dog libby likes them, so it easy to give and it prevents tape worms too so win win!
Date published: 2015-10-21
Rated 5 out of 5 by from Hard to Beat!! Our family member is a 9 pound Schnoodle named Sparky. He came to us via the Animal Shelter a little more than two years ago, When we first had him checked out by the Vet, Iverhart Max was one of the recommended products. We have been giving it to Sparky since he was 8 weeks old and he has come up negative in every semi-annual checkup for worms and parasites. He is one healthy little guy thanks in part to Iverhart Max. (sometimes I think a bit too healthy)
Date published: 2015-10-11
Rated 5 out of 5 by from Mati is always anxious to take her Iverhart Max. She had blood work done when she had her yearly check up a few weeks ago and the vet said she is a very healthy dog.
Date published: 2015-10-06
Rated 5 out of 5 by from It's like the pillss were made for Aussies! Great price! Perfect for Aussies! If you have an Aussie, this product is great. Aussies are known to have sensitive stomach for certain medications. If you have an Aussie you need to know that this breed is sensitive to some ingredients (particularly pesticide type). I tried a few other heart guard medications and this one is the only one my dogs accept and do not have reactions to. I also could not find this particular medication at any retail or online store for less than I pay for it here on 800-pet-meds. I recommend to anyone with Aussies
Date published: 2015-10-03
Rated 5 out of 5 by from Great product and business to work with Fantastic service!!!! Just had to order and they contacted my office for me!
Date published: 2015-09-29
Rated 5 out of 5 by from I have had no issues with this product. My dog was using it at a no-kill shelter and when my vet did not carry it I got a prescription for PedMeds. My dog eats these very well also.
Date published: 2015-09-29
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My vet called to tell me my dog has hookworms. Why is this? He takes this product every month year round for 3 years. 

Asked by: Missyg
All monthly heartworm prevention medications deworm the pet on the day it is given. Unfortunately, some intestinal parasites, such as hookworms, have a life cycle that is around 2 weeks and pets can become re-infected during the month and have adult worms in their system before the next monthly heartworm prevention. Most of the time, it is not that much of an issue, but if the ground your pet comes in contact with has a heavy load of larva in it, a resulting heavy adult parasite load in the pet can result and cause a medical problem. In these cases, a deworming in the middle of the monthly heartworm prevention cycle is recommended.
Answered by: SuzyCVT
Date published: 2017-03-02

When will this be back in.stock?

Asked by: Sassyscissors98
We do not have an expected date for the return of this medication. There are several alternatives to it which are very cost effective. Please call your veterinarian and your 1800PetMeds pharmacists for a list of available products that may be considered alternatives.
Answered by: 1800Petmeds Pharmacist
Date published: 2017-01-12

How long past expiation date can you use this product and still be effective. I know expiration dates are a guideline. Usually you can go up to a year beyond but would like to know you answer on this.

Asked by: Shaz
We do not recommend using an expired medication. The medication is no longer fully effective once it is expired, and its effectiveness cannot be guaranteed or determined.
Answered by: Christine
Date published: 2017-01-19

When will this medication be available?

Asked by: Beth
Virbac has suspended production on this product and at the moment there is no ETA available as to when it will be available again. We do suggest contacting your pet's Veterinarian for possible alternatives.
Answered by: Pharmacy Manager
Date published: 2016-08-27

Have been using Iverhart Plus by Virbac. Is this same rx.

Asked by: Anonymous
Iverhart Max is the same as Iverhart Plus except for the addition of another medication that will kill tapeworms.
Answered by: Anonymous
Date published: 2016-12-23

Has the medication ever failed?

Is it required to get a heart worm test while on IverHeart Max? Has any dog contracted heart worm while on the medication?
Asked by: Anonymous
My dog did not test positive for heartworms but became infested with hookworms, which it is also supposed to prevent, in the four months that she took this product.
Answered by: Anonymous
Date published: 2015-12-05

when are going to get some more? worm meds

Asked by: Anonymous
Virbac products have been on and off backorder from the manufacturer for months with no end in immediate sight. It looks like Iverhart Plus is still in stock (for the moment) or you can try one of the other available heartworm preventions. If you want one that specifically does heartworm, intestinal worms and tapeworms, I recommend Sentinel Spectrum.
Answered by: Anonymous
Date published: 2015-10-20

My dog is 12 lb 8 oz. Should I go with the 6 to 12 lb?

Asked by: Anonymous
Normally vets will recommend going to the next size up, 12-25lb size, when the pet's weight is on the boarder, to ensure the pet is fully covered. Please consult your vet to decide which size would be most appropriate for your pet.
Answered by: S Duesler PharmD MBA
Date published: 2015-08-28
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