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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 skin. Discontinue 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 3.9 out of 5 by 47.
Rated 5 out of 5 by from Good results! This was a product one of our vets suggested. Within two days the ear infection was clearing up. Our baby is feeling much better!
Date published: 2016-11-05
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
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Do you need a script to order this medicine?

Asked by: jt4merrick
Yes you need a prescription for this product.
Answered by: Ben B
Date published: 2017-03-15

Can it be used on outside of ears as well as in?

Asked by: ppenatz
Otomox suspension is made to be put inside the ear canal for ear infections in dogs. Although it will not harm the animal if used on the outside of the ear, it is not recommended. There are other topical products that can be used. For specific instructions, I would talk with your Veterinarian about what your pet needs based on what is wrong with the pet. Hope this helps.
Answered by: Trey W
Date published: 2017-02-23

Can I use Otomax for dogs on a cat?

Asked by: bonbon
Hello, This product is only indicated/approved for use in dogs. There may be other better options available for cats. I would talk to your Vet about specific products.
Answered by: Trey W
Date published: 2017-02-21

My dog weighs 60 pounds .how much otomax do I order? 15 mg or the 30mg

Asked by: Cathy
The quantity required would depend on how long a period of time your pet must use this medication for. It is best to consult with the Veterinarian for specific dosing and timeline.
Answered by: 1800Petmeds Pharmacist
Date published: 2016-12-30

Do I have to flush my dogs ears with a cleaner first before applying the medicine?

Asked by: Jen55
It is generally better to clean the ears before application although this is not an absolute requirement for product use.
Answered by: 1800Petmeds Pharmacist
Date published: 2016-12-30

Is Remicin the same as Otomax?

Asked by: Anonymous
Yes, both Remicin and Otomax contain the following active ingredients: Gentamicin Sulfate, Betamethasone Valerate, and Clotrimazole.
Answered by: Christine
Date published: 2016-10-21

can this be used in inner ear?

Asked by: mickey
Yes, this is usually applied by placing the specified number of drops into the ear canal twice daily.
Answered by: Christine
Date published: 2016-10-22

How much does it cost?

Asked by: martin
A 15 gram bottle currently costs $29.69 with our "TOPTEN" coupon. A 30 gram bottle costs $44.99 with our "TOPTEN" coupon.
Answered by: Christine
Date published: 2016-10-10
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