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Product Info
How to Use
Customer Reviews
Product Info
What is Otomax?

Otomax is used to treat bacterial infections of the outer ear in dogs. Otomax requires a prescription from your veterinarian.



  • Treats both acute and chronic ear infections
  • Easy to administer has the consistency of a solution with the prolonged contact time of an ointment
How it Works:

By virtue of its three active ingredients Gentamicin, Betamethasone, and Clotrimazole, Otomax ointment provides antibacterial, anti-inflammatory, and antifungal activity to combat infections of the outer ear accompanied by inflammation.


Otomax may have negative interactions with other products. Disclose to your veterinarian everything you are giving your dog.

Brand Name:

Otomax (Schering-Plough)

Generic Name:

Gentamicin Sulfate Veterinary, Betamethasone Valerate, USP and Clotrimazole, USP

What is the most important information I should know about Otomax:

Otomax is a prescription medicine FDA approved for veterinary use in dogs. Otomax is available in 7.5gm, 15gm and 30gm tubes. Each gm contains gentamicin sulfate equivalent to 3mg gentamicin base, betamethasone valerate equivalent to 1mg betamethasone and clotrimazole 10mg. Prior to use the external ear should be cleaned and dried and excessive hair should be clipped from the treatment area. Otomax should not be used in pets with perforated ear drums.

What is Otomax:

Otomax is an antimicrobial, corticosteroid and antifungal combination used on dogs for the treatment of acute and chronic otitis externa associated with yeast and/or bacteria susceptible to gentamicin. Otomax may also be used for purposes other than those listed.

What should I discuss with my veterinarian before using Otomax on my pet:

Do not use Otomax if the pet has a viral or fungal infection. Tell your veterinarian if your pet is pregnant or lactating.

How should this medication be used:

Use this medication exactly as directed by your veterinarian. If you do not understand the directions ask the pharmacist or veterinarian to explain them to you. The usual dose for dogs less than 30 lbs is 4 drops into the ear canal twice a day, and for dogs over 30 lbs use 8 drops into the ear canal twice a day. Store Otomax at room temperature, away from moisture and heat. Keep out of the reach of children or pets. 

What happens if I miss applying a dose:

Apply the missed dose as soon as you remember. However, if it is almost time for the next regularly scheduled dose, skip the missed dose and apply the next one as directed. Do not give a double dose of the medication.

What happens if I overdose the pet:

An overdose of this medication is unlikely. If an overdose is suspected, seek emergency veterinary medical treatment.

What should I avoid while applying Otomax to my pet:

Do not use this medication in pets allergic to it or any of the individual ingredients. Do not use in dogs with perforated ear drums. Discontinue use of this medication and contact the veterinarian if hearing loss is noted during treatment. Treatment beyond 7 days may lead to prolonged wound healing.

What are the possible side effects of Otomax:

Side effects associated with this medication are related to the individual ingredients. Gentamicin, while absorbed poorly from the skin, when applied topically to large wounds, burns, or denuded skin for prolonged periods of time has a potential for reversible or irreversible ear and kidney toxicity. Following the use of injected or oral corticosteroids, side effects such as weight loss, loss of appetite, increased thirst and urination and vomiting and diarrhea may occur. Betamethasone is a corticosteroid but is applied topically. In humans, clotrimazole has been observed to occasionally cause redness of the skin, stinging, blistering, peeling, fluid retention, itching, hives and general irritation of the ski. Continue the medication and talk to your veterinarian about any side effect that seems unusual or bothersome to your pet.

What other drugs will affect Otomax:

Before using Otomax, tell your veterinarian if your pet is using other antibiotic, antifungal or corticosteroid medications either topically or by mouth. Talk to the veterinarian or pharmacist before giving any prescription or over the counter medicines.

Where can I get more information:

Your pharmacist has additional information about Otomax written for health professionals that you may read.

How to Use
  • Otomax is a prescription medication used in dogs to treat acute and chronic otitis externa (outer ear infections) associated with yeast and/or bacteria susceptible to Gentamicin.
  • Otomax is an antimicrobial, corticosteroid, and antifungal combination medication.
  • Otomax should not be used in pets with perforated ear drums.

Prior to use the external ear should be cleaned and dried, and excessive hair should be clipped from the treatment area.

Under 30 lbs
Apply 4 drops into the ear canal twice a day as directed by your veterinarian
Over 30 lbs
Apply 8 drops into the ear canal twice a day as directed by your veterinarian
Do not use!
Do not use!

Store this product at room temperature, away from moisture and heat.

Active Ingredients* (per gram)
Gentamicin Sulfate
3 mg
Betamethasone Valerate
1 mg
10 mg
* Ingredients in a mineral oil-based system containing a plasticized hydrocarbon gel.
Customer Reviews
Otomax is rated 3.8913 out of 5 by 46.
Rated 5 out of 5 by from love this product I have a beagle and the past few years he has issues with inflammation and infections and scratches his poor ears until they he bleeds... the vet gave us this to use and it works fast and does what it is suppose to. we recently had to use it again and in a few days he will be as good as new. I really recommend this product but just use this as directed..
Date published: 2015-10-08
Rated 5 out of 5 by from Ear infection miracle cure I've used Otomax several times (my dog has floppy ears and is prone to infections) and it always does just what it is supposed to - the infections are cured every time.
Date published: 2015-09-05
Rated 5 out of 5 by from hot spots this product works really well on hot spots also
Date published: 2014-10-31
Rated 5 out of 5 by from Great Product! - Works Quickly I have two Cocker Spaniels and they need special care for those long beautiful ears; Just a few days of use of Otomax and their ears are back to normal. No more inflammation, no more redness, no more discomfort! Works fast and works well!
Date published: 2014-08-23
Rated 5 out of 5 by from Saves Harley from a lot of discomfort I have an 8 year old French Bulldog, and as any owner will tell you, they have serious allergy issues. Poor Harley was born deaf (gotta love puppy mills), but 2 or 3 years ago, my vet, whom I've trusted with numerous pets over the years, recommended Otomax for Harley. He was digging his ears to the point they'd bleed on the backside, and there was this "goo" that I discovered upon cleaning his ears. After 2 applications of Otomax, the goo was gone, and he showed marked improvement. The reviews I've read here have me questioning if hearing loss in the beloved pets IS from not catching it earlier, or something of that nature. My experience with the product has been ONLY positive, and I would recommend it to any pet parent.
Date published: 2014-05-31
Rated 5 out of 5 by from My Pom was a rescue in 2003 who had been beaten with a golf club by his owner. He has had ear infections and problems since. Otomax has been the only product to ease the pain and problems almost instantly when they flair up. His hearing is excellent and not problems what so ever with using this for years now.The vet tried another but it just didn't work as quickly and as well as Otomax. Two days max and Bear wasn't holding his head sideways and back to his playful self. He hearing is better than ours. :)
Date published: 2013-03-30
Rated 5 out of 5 by from Use just what is prescribed My APBT had dirty ears with wax buildup and gunk and had a slight odor. The vet cleaned his ears and then applied a compact to seal a medicine in his ears. When I returned with the dog to get the compact out I was given Virbac Hexadene Flush, an antiseptic ear cleaner and Otomax. The vet said to flush the ears and then add just one drop of Otomax in each ear per day for no more than two days. Spread the one drop around the middle of the ear with your finger. Redness and odor and scratching are gone within hours. I've used the Virbac flush and Otomax (when ears were red and began to smell) several times and results were always excellent.
Date published: 2013-01-12
Rated 5 out of 5 by from Definitely Recommend Our beautiful husky was stricken with allergies this past summer. His entire face was ladden with marks and open sores and as a result he would tend to scratch and irritate it even more. We went to our vet who did an allergy test and after receiving the results which listed 10+ ailments, we were at a loss as to what to do. After given severals medication, which weren't effective, my husband and I decided to see an allergy specialist. She gave us Otomax and from day one, the product proved effective. Not only did the spots on our dogs' healed nicely, he is almost back to his handsome self. I would most definitely recommedn this product.
Date published: 2013-01-07
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Is there a risk of overdose?

I was prescribed this for my Shar Pei ear infections. I cant tell how many drops are going in since I was told to stick the longer needle tube down his ear canal a little bit. I worry I may be putting in too much because the dog runs around like crazy and is constantly tilting his head back for about 15 mins after application.
Asked by: SharPei 3456
I am NOT a vet. However you're right, it's hard to tell how much is going in. The way I do it is: I squeeze nice and hard - and usually do a test run each time to make sure I'm actually getting something out (half the time I'm doing it too softly). But then in the dog's ear, I do it in clear pulses (not 1 big squeeze) and just stop at the # of drops it recommends. If I missed a squeeze, so they'll get a little bit less than they should - but there won't ever be too much. That said, they should be shaking their heads as soon as you're done so if there was any excess, they should shake it right out. Just dry the inside of their ears off with a cotton ball when you're done. No idea if that was helpful but hopefully so!
Answered by: HJS
Date published: 2015-09-05

Is Otomax and Gentizol ointment the same med?

Asked by: Molinka
Answered by: nurseynicole
Date published: 2015-05-26

Can Otomax be used on dogs feet?

I was prescribed Otomax for my dogs feet. He has a bacterial and yeast infection on his feet, and a yeast infection in his ears. I was prescribed Mometemax for the ears, and Otomax for the feet. I looked it up on here and it states this medication is for ears, and shouldn't be used if there is a fungal infection. Is it safe to administer or was I given unsafe meds?
Asked by: Heather
sometimes a vet will prescribe a medication for an off label use. The product will work just as well on a different body part to address bacterial or yeast infection. If you are still concerned then do not hesitate to have your vet explain.
Answered by: Linda M 1800petmeds pharmacist
Date published: 2013-11-27

Anyone used this for pseudomonas type infection?

My great dane has had an infection in both ears for just over the last year that just won't go away. Finally got a vet (the first out of three!!!) to culture it, and its a pseudomonas bacteria #virus?). She prescribed this - fortunately she was able to special order a 215g bottle. Has anyone used Otomax to treat a pseudomonas, and did it work?
Asked by: Bill and Bailey
Otomax has a combination of 3 different drugs in it. The gentamicin is usually effective against psuedomonas.
Answered by: Kelly P
Date published: 2013-02-11

how do i get a perscription from my vet?

Asked by: christinamd
your vet will need to examine the pet first and then determine if this item is the best course of treatment. The vet can call us or fax and email scripts to our pharmacists to fill for your pet. The other thing you can do is place an order with our customer care and we can call your vet for you to obtain permission to dispense this medication. Some vet offices prefer that you mail us the prescription.
Answered by: Linda M 1800petmeds pharmacist
Date published: 2013-01-31

I was prescribed Otomax 15mg from my vet and it was put in there own container with no expiration date. How long is the shelf like on this product ?

Asked by: Debbie
Hi Debbie, The shelf-life of Otomax in its unopened sale package is approximately 24 months (two years). After opening the immediate packaging, the shelf-life is 14 days. Thank you.
Answered by: Rich - Student Pharmacist
Date published: 2012-08-11

Otomax and Posatex -Are these medications the same?

Are these medications the same?
Asked by: evmsu1
Hello and thank you for your question. These two medications are not the same; although they both are indicated for an external ear infection, they have different ingredients to help combat the inflammation (associated with infection).
Answered by: Rich - Student Pharmacist
Date published: 2012-07-27

does it help with swelling

Asked by: santiao
This medication will help to reduce some swelling and inflammation.
Answered by: Janine/Pharmacist
Date published: 2012-05-08
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