Iverhart Max Recall

veterinary news

There sure have been a lot of recalls lately!  This time, instead of a pet food recall, this one affects the heartworm medication, Iverhart Max.  The medication was voluntarily recalled because of concerns withIverhart Maxthe stability of the main ingredient, Ivermectin.

Why is Iverhart Max being recalled?

Virbac, who makes the product does extensive safety testing.  In a letter sent to veterinarians, Virbac said:

“…routine product testing has determined that the ivermectin (an active ingredient) has failed to meet our required stability specifications. Consequently, some dogs dosed with the identified lot may not be fully protected against heartworm disease.”

You can read the press release here.  So far, there has been no official recall announced by the FDA.

What lots are affected?

Only one lot of Iverhart Max is affected.  This is lot #110482 for large dogs weighing 50-100 lbs.  Testing has showed that no other sizes of Iverhart Max are affected.

Is my dog in danger?


If your dog has received this medication, there is no immediate danger.  The medication is not toxic or harmful to the pet.  However, if you live in an area that has mosquitos at this time of the year, then there is a risk that your dog will not be protected against heartworm.

If your dog has been on Iverhart Max, it is best for you to contact your veterinarian to receive directions on what to do.  If you live in a heartworm endemic area, the vet may suggest that you have a blood test done for heartworm about 6 months from now as it takes 6 months to be able to determine if a dog is heartworm positive.  Or, if your dog has only just recently started this medication, the vet may decide to supplement it with another one.

Have you been affected?

If you have been using the recalled Iverhart Max, I would love for you to leave a comment.  How long did you have the medication for?  What is your vet recommending?  Leaving a comment will help others who are searching for information on this topic.

About the author

Dr. Marie

Dr. Marie is a veterinarian treating dogs, cats, and pocket pets. Click here to ask Dr. Marie a question.


Follow Dr. Marie on Twitter

Become a Fan of Dr. Marie on Facebook

2 Responses to "Iverhart Max Recall"

  1. doris says:

    wow, I am disgusted with the vets in Hill county,TX! They are only concerned with how much $$ they make. They have all switched to Iverhart,since the other choice allowed online ordering to the public. NONE of them will give me a prescript for the heartworm meds! Even after I told them I could not afford to pay the extra profit they received from selling me the product. I have 2 dogs and 2 cats and have had as many as 4/4. All orphaned and left on our property.I left the Whitney vets,because they outright stated, ” yes, It is more importatnt for me to get the extra money, than to keep you as a customer!” They HAD been our vet for 25 years!
    I have paid to have the heartworm treatment for a dog someone abandoned. that was $650! I had a cat that constantly was injured (nuetering did not calm him) and spent a lot of money getting him patched up. He died from vvet neglect to clean his teeth and cure gum disease. He was however 22 years old,but otherwise in great health.

  2. Allen Flowers says:

    My Veterinarian has just prescribed Iverhart Max, Lot# 130444. Is it safe to use?

Leave a Reply


IMPORTANT: Dr. Marie does not answer questions about your pets in the comments section. Click here to ask a vet about your pet.




Ask A Vet

Stay up to date!

Receive each veterinary news story by email.

Enter your email address:

We value your privacy!

Easy unsubscribe at any time.

Popular Right Now


All content © Ask A Vet Question