PetMeds® Pet Ear Antibiotic Mometamax

In this post I will address some of the common questions asked about using the commonly prescribed topical ear antibiotic and antifungal product Mometamax.  Given that most dogs with ear infections often have a combination of bacteria and/or yeast, this product is one of the most versatile products available in the veterinary pharmacy and available by prescription from 1800PetMeds. The combination of ingredients not only decreases the underlying allergic reaction, but the overgrowth of various bacteria and yeast involved in the majority of canine or feline ear infections.

Although it is not labeled for use in cats, (as with many drugs used off label in our pets), many veterinarians have prescribed this product widely to cats without any ill side effects. While it won’t kill ear mites, this product can also be used topically for yeast, local ringworm or bacterial infections. One of the biggest advantages over its nearly identical sister product Otomax, is that Mometamax can be used only once daily, thus increasing client compliance.  My two favorite topical ear medicines in our pets include Mometamax and Zymox.

Treating your pet's ear infection with an antibiotic like Zymox or Mometamax may be prescribed by your vet

While Mometamax is a prescription topical antifungal and antibacterial, Zymox is a nonprescription topical which in my experience and opinion is as equally effective through a different mechanism in killing yeast and bacteria in the canine or feline ear canal. Side effects of Mometamax are rare, with the most serious being rare deafness in pets whose ear drum is not intact (this is best determined by veterinary exam of the ear canal before starting this medication), allergic reaction consisting of increased redness, discomfort and ear itching, and even more rare facial swelling.

When used appropriately this product can be used for most common ear infections in our pets, and its long shelf life of at least a year in most cases, makes it a valuable part of the medicine cabinet in those pets with recurrent ear inflammations or infections.

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  1. There needs to be a class action lawsuit for the deafness caused by Mometamax. They tell you over the phone that deafness is rare. This is because people are not reporting it to Merck or to the FDA. Veterinary clinics are not reporting it to Merck or the FDA. If everyone reported it it would not appear to be so “rare”! If this was happening to human children it would have already been pulled off of the market. Everyone who has experienced deafness due to Mometamax in their dog or animal please contact MERCK. Do a search for Mometamax and you will get the drug website and their contact information. Call them and report it because then they are legally required to report it to the FDA. Tell your vets to report the side effects of deafness to Merck. They will offer to reimburse you for the exam. If you take compensation then more than likely you could not participate in a class action lawsuit.

    • I just spoke again with the Vet and she said in her 20 year career as a Vet, deafness due to this medication happened only once. She further stated that she had spoken to the drug company representative and they offered to reimburse us for the cost of the medication and 2 vet visits. I am interested in a class action law suit against this company just in reviewing this web site. I will refuse the compensation if it does not allow me to participate. I have another apt with another vet this afternoon.

      • Dr. Michael Dym, VMD veterinarianMarch 18, 2015 at 2:00 pm · Reply

        So sorry Sandy to hear of your experience with this product. That is why I dont use it in my clinical practice.

  2. Been over four months now since my Scottie lost his hearing due to the mometamax and no change, unfortunately I have to accept that he will never get it back (as I was told if he didn’t get it back within three months he never would) I totally agree with the fact that this medication should be removed from the market. It makes no sense to prescribe a medication that causes more harm to an animal. Its Cruel –

  3. Please EVERYONE who has experienced any deafness with Mometamax whether hearing has returned or not, report this to the manufacturer AND the FDA.

    • I am just devastated that our 11 year old German Shepard has also experienced loss of his hearing. I have already filed a report with Merck. May or may not get any hearing back is what they said and it can take 2 to 3 months. If this was your baby or child?? Would you find this acceptable. Completely disgusted! I would of never allowed it to be administered if I had any idea of the side effects. Someone should be held accountable and this should be taken off the market.

      • Please ask your vet to report all cases of deafness due to Mometamax to the FDA. Also, it wouldn’t hurt for you to go to the FDA website and look for the Animal Health Division and download the forms and report it to them also.

      • My dog still has not regained his hearing. Sometimes we think he hears, but 5 minutes later he can not hear anything. I am writing to all the veterinarian associations to ask them to enc I urge vets to report deafness due to Mometamax in any degree whether the dogs regain hearing or not. I encourage everyone who reads this to contact every association they can and maybe if we make enough no ways everyone who reads this to contact every association they can and maybe if we make enough noise they will start looking at this medicine. there have been many lawsuits about send some my lessonthere have been many lawsuits about gentamicin causing deafness in humans. I am devastated that my older dog may have to live his last few days deaf because of a bad drug.

  4. We are just devastated! We took our little bischon into the Vet for symptoms of an ear infection. The Vet examined and took an ear swab to confirm it was a yeast infection and prescribed Mometamax. After using it as prescribed for 8 days she is now totally deaf. We were not warned of this side effect and had we have been, would have chose another option. Mometamax should be taken off the market and not prescribed ever! I cannot express enough how upsetting this is. We were told by the Vet it is possible her hearing may return after 3 or 4 months and then prescribed Fish Oil 1000 I.U and Vitamin E 200 I.U. three times per day. Has anyone been fortunate enough to have their pet’s hearing restored over time?

    • Please report this to the FDA Division of Animal Health. Until all the deafness is reported to the FDA by vets or pet owners, it will continue to be prescribe. You can look up the FDA on the internet and download the form for the report.

    • Dr. Michael Dym, VMD veterinarianMarch 18, 2015 at 2:01 pm · Reply

      I am so sorry to hear of your experiences with this product.

  5. Otomax just made my male deaf. Complete game changer. Im completely pissed, although I had him trained in two languages and hand signals, things are 100% different now. Seemingly sucked the life outta him, very sad. As many said previously I wasn’t warned of the possibility. My female seems to recognize this and seems to try to help him and also begun to challenge the lead dog. What I got? A free vet visit when I brought him back in and some free wash for his ears, which he’s completely terrified of.

    • Ryan please report this to the FDA and encourage your vet to report all cases. You can search on the internet fir There is an animal health division. Until these are reported, nothing wI’ll be done.

    • Dr. Michael Dym, VMD veterinarianMarch 18, 2015 at 1:43 pm · Reply

      So sorry to hear of this unfortunate side effect in your kitty.

  6. My 10.5 year old lab had a double ear infection and the vet prescribed him Mometamax. We gave it to him for 4 days and then i realized he was going deaf so we stopped 3 days ago, reported to our vet today who is looking into this…and now just went online and saw all these posts. He can no longer hear. We used mineral oil to clean out his ears in hopes that it would remove any Mometamax.

    Will his hearing be restored after a period of time or is this irreversible? Like everyone else, I am beside myself right now. Thanks-Clark

    • Dr. Michael Dym, VMD veterinarianMarch 24, 2015 at 12:06 am · Reply

      Hopefully the hearing will slowly be restored over coming few weeks. Best to followup with your vet and the drug company

  7. Joyce, if you find a way to pursue this further to get this poison off the market or learn of a class action lawsuit, I would love to be a part of it. My 11 year old American Eskimo was given Mometamax for a yeast infection in February. After that he lost about 25% of his hearing. The vet said it was due to old age although his hearing was perfect prior to that. I chalked his hearing loss up to the infection. A week ago he was given it again for another yeast infection. Five days later he was totally deaf. I am sick!!! I have already called Merck and have a case but what will that do? This is NOT rare. When I went to the vet for an ear flush, I was told that they had three cases in three weeks of dogs going deaf. Why had they not warned me? Something has to be done!!!

  8. I have a 19 yr. old Jack Russell who is being diagnosed with a vulva yeast infection. Dr. Prescribed Mometamax to be inserted daily for a week into her vagina …..everything I’m reading about this med is stating to be used in ears. We suspect she has obtained yeast infection from the antibiotics she took a couple weeks ago for a UT. Afraid to use this without some reassurance…..anybody have a thought?

  9. I too have experienced the effects of Mometamax. It was prescribed to my dog and a week later he is now very hard of hearing. Sometimes he can hear if I’m loud and other times not at all. I’m beyond pissed!!! My little guy used to have excellent hearing. Going to the vets on Monday. The tech on the phone said that what they did shouldn’t have any thing to do with his hearing and that’s it’s probably a coensedense. Yeah right. He isn’t even 3 years old!!!

    • Dr. Michael Dym, VMD veterinarianMarch 29, 2016 at 4:37 am · Reply

      Sorry to hear about his hearing loss. Hopefully the hearing will return gradually on cessation of the medication

  10. Dr. Michael Dym, VMD veterinarianJuly 26, 2014 at 6:04 am · Reply

    ODd Heather how you bring up 4 MAJOR POLITICAL ORGANAZATIONS OF VETERINARY MEDICINE, WHOSE AGENDAS ARE INFLUENCED BY MAJOR PHARMACOPIA, and NOT INDEPENDENT, unbiased studies IN the United States, the AVMA hardly is considered a well respected objective and independent authority. …. Try looking at the study done by my brilliant veterinary colleague Shelley Epstein, VMD, who has an AAHA certified VERY BUSY traditional and homeopathic veterinary hospital in Wilmington, Delaware……nanomedicine-part-2 on this idea of how homeopathic remedies work on a physics level in the patient, which is WAY deeper than the biochemical surface of the body. Again you should not put down something you know little about. I can list numerous other studies on homeopathy here, however for the blog readers who simply want to find VERY KNOWLEDGABLE practitioners of veterinary homeopathy, and read about one of the most brilliant i.e Richard Pitcairn, DVM, PHd, whose PHD is in IMMUNOLOGY….. go to and read about studies Dr Pitcairn has listed there, as well as the other two websites in my prior posting…. I am sure studies are listed there as well. I suppose these hundreds of often Ivy league trained BRILLIANT veterinarians, must have had mental health breakdowns, because as someone who also attends annual homeopathy meetings, I suppose the case conferences presented on cures with very deep pathologies must be placebo or power of prayer…..

  11. WillowMorningskyJuly 26, 2014 at 6:52 pm · Reply

    Russ, if you don’t want to use Homeopathics, don’t. If you just want to fight for the sake of combat, please take it elsewhere. When something works for people, it works. Double blind studies are erroneous and later mis-proven all the time. And people cheat. Trust in your inner self, Young Man. Follow your own core of integrity, experience and perception. Quit looking for truth and answers in the experience of others and the external world. If you have a need and want to learn about the efficacy of Homeopathics, try them. If you perceive beneficial results, use them again. If not, use something else. Don’t spend your life engaging in battles just for the sake of your desire to stroke your ego at the expense of someone else. You will not bring yourself an excellence of life in doing so. And you will not gain the respect of people by doing so. Learn to value your self for the person you are and conduct yourself in ways that you respect so that you know inside yourself that you have integrity. Don’t throw it out to battles with others to try to gain self- respect by winning. Be compassionate and care that other people are not trampled on by your need to win. Seek knowledge through experience and trust your own intuition. Choose your path for your own forward movement, not for what you feel is glory in proving yourself better than others. I hope you understand what I am trying to share with you.

  12. Dr. Michael Dym, VMD veterinarianJuly 27, 2014 at 4:31 pm · Reply

    Hi Joe….FYI….. papers-and-related-material I supposed this organization is full of formerly mentally competent veterinarians who went off the deep end…. See this website for documented papers…. as well as

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