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Iverhart Max

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Starts $41.04 $28.80 
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Starts $41.04 $28.80 
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Step 1. Select Pet's Weight:


Step 2. Select a Supply:

6 pack
Price w/coupon SAVE20
Free Shipping
12 pack
Price w/coupon SAVE20
Free Shipping
Save $5 over 6 pk

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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

Iverhart Max Directions:

  • 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.

Iverhart Max Dosage for Dogs/Puppies (8 weeks of age and older):

Dogs/Puppies (8 weeks of age and older):
6 - 12 lbsGive 1 chewable every month (Magenta Box)
12.1 - 25 lbsGive 1 chewable every month (Blue Box)
25.1 - 50 lbsGive 1 chewable every month (Green Box)
50.1-100 lbsGive 1 chewable every month (Brown Box)
Over 100 lbsGive combination of chewables based on weight
Iverhart Max Dosage for Cats:
Do not use!
Iverhart Max Dosage for Horses:
Do not use!

Should be stored at room temperature.


Iverhart Max Ingredients:

Iverhart Max- Magenta Box (Dogs 6-12 lbs):
Active Ingredients (per chewable tablet)Amount
Ivermectin34 mcg
Pyrantel Pamoate28.5 mg
Praziquantel28.5 mg
Iverhart Max- Blue Box (Dogs 12.1-25 lbs):
Active Ingredients (per chewable tablet)Amount
Ivermectin68 mcg
Pyrantel Pamoate57 mg
Praziquantel57 mg
Iverhart Max - Green Box (Dogs 25.1-50 lbs):
Active Ingredients (per chewable tablet)Amount
Ivermectin136 mcg
Pyrantel Pamoate114 mg
Praziquantel114 mg
Iverhart Max - Brown Box (Dogs 50.1-100 lbs):
Active Ingredients (per chewable tablet)Amount
Ivermectin272 mcg
Pyrantel Pamoate228 mg
Praziquantel228 mg
Customer Reviews
Iverhart Max is rated 4.3 out of 5 by 225.
Rated 5 out of 5 by from I am sooo glad iverhart max is back. great product Ever since our veterinarian recommended iverhart a few years back , I have been very pleased with the product. If our 4 dogs do well with it than I will continue purchasing it.
Date published: 2017-10-07
Rated 5 out of 5 by from Excellent product I purchased this product for our new rescue dog since we had excellent results using it with our previous dogs. We used the product for years with each of them. Our Vet tests showed negative yearly during their use. Zoey has only a month of use so far.
Date published: 2017-08-09
Rated 5 out of 5 by from Iverhart Max Review My dogs did not like Interceptor. It became very difficult to try to get them to take it, even cutting it up into tiny pieces and putting into their food. My older lab had been on Iverhart before, and had no problems with it. I tried the Iverhart with my young adult dog (1+ yr) and had absolutely no problem with her taking it! Hallejuah!
Date published: 2017-08-02
Rated 4 out of 5 by from No problems I've used Iverhart Max for years with several dogs &, no, none of them have taken them as willingly as the chewable kind but, when I crush & mix with a bit of canned food, they are readily consumed. Have not had an incidence of heartworm or any other parasite. I'll continue to use these until I have a negative result.
Date published: 2017-07-18
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
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Is Iverhart max safe for dogs with PLN. In other words, does this product include protein, phosphorus or sodium?

Asked by: Jane
Contact the manufacturer, Virbac, at 1-844-484-7222 for a list of inactive ingredients. Also, your veterinarian will determine if Iverhart Max is appropriate with your pet's condition.
Answered by: Lisa M
Date published: 2017-11-13

How do I get a prescription from my dogs' vet?

Asked by: rita
Your veterinarian may call in your prescription or fax it to us. They can also provide a written prescription for you to mail in. 1800PetMeds 420 S. Congress Ave Delray Beach, FL 33445 888 738 6331 phone 800 600 8285 fax
Answered by: Lisa M
Date published: 2017-11-07

Are Belgian Sheepdogs sensitive to Iverhart

Asked by: Beaugeste
If your Belgian Sheepdog, being a "Collie-type" dog, carried the MDR1 mutation, he/she may be sensitive to ivermectin, the active ingredient in Iverhart. To be safe, I would recommend a heartworm prevention that does not have ivermectin or a derivative as an ingredient., Some suggestions are Interceptor, Interceptor Plus, Sentinel and Sentinel Plus.
Answered by: SuzyCVT
Date published: 2017-09-22

I have an expiration date of May of 2014 are these still any good they have never been opened. A lot number 11129 1

Asked by: Buddy
Thank you for your question. The drug is past it's expiration date, meaning that it is altered from it's intended state. Please order a new one for full effect.
Answered by: leanniejo
Date published: 2017-07-31

Are there any proteins (beef, chicken, etc) in this medication? Our dog has food allergies. Thanks 

Asked by: Lklein
This product contains pork and beef flavoring.
Answered by: Megan Student Pharmacist
Date published: 2017-07-11

My chi won't chew any pill, is it okay to put it down his throat?

Asked by: Poco
Yes, you can poke it down your dog's throat (I have to with my dog) and I always give a treat or some food right after. The act of poking medications down a pet's throat does not cause vomiting in and of itself. Vomiting medication is a potential risk with any medication no matter how it is given.
Answered by: SuzyCVT
Date published: 2017-04-08

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: 2017-09-12

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
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