Claro in Dogs

Claro is a prescription ear medication used in dogs for otitis externa, which is an infection and inflammation of the outer ear canal. It combines three active ingredients: florfenicol to target certain bacteria, terbinafine to target yeast, and mometasone furoate to reduce inflammation and itching. The product is labeled for dogs only and is given as a single-dose treatment placed into the ear canal by veterinary personnel.

One reason Claro gets attention is convenience. Unlike many ear medications that need to be given at home once or twice daily, Claro is designed to have a 30-day duration of effect after one in-clinic application. That can be helpful for pet parents who have trouble medicating painful ears or for dogs that strongly resist ear handling. Even so, convenience does not replace diagnosis. Your vet still needs to confirm that the eardrum is intact and that the infection pattern fits this medication.

Claro is not the right choice for every dog with an ear problem. Ear infections can be caused or complicated by allergies, trapped moisture, ear mites, foreign material, resistant bacteria, chronic thickening of the canal, or middle ear disease. In many dogs, the medication treats the current flare but the long-term plan also needs to address the underlying trigger. That is why rechecks, ear cytology, and prevention planning still matter even with a long-acting product.

Pet parents should also know that Claro has important safety warnings. It should not be used in dogs with a known or suspected ruptured eardrum, and it should not be used in cats. Eye exposure is a known concern because dogs may shake their heads after application, causing splatter. If your dog develops worsening pain, head tilt, balance changes, hearing changes, vomiting, or eye discomfort after treatment, contact your vet promptly.

Claro works by combining three different actions in one ear medication. Florfenicol is an antibacterial ingredient active against susceptible bacteria involved in canine otitis externa, including Staphylococcus pseudintermedius. Terbinafine is an antifungal ingredient that helps control Malassezia pachydermatis, a yeast commonly found in dog ear infections. Mometasone furoate is a corticosteroid that reduces swelling, redness, discharge, and itch in the inflamed ear canal.

The medication is formulated as a single 1 mL dose placed into the affected ear canal. After application, your vet gently massages the base of the ear to distribute the solution. The labeled effect is intended to last 30 days. Because the product is meant to remain in the ear canal, cleaning the ear after dosing may reduce effectiveness. That is different from many shorter-acting ear drops, where pet parents clean and medicate at home for a week or more.

This long-acting approach can be useful when a dog is painful, difficult to medicate, or likely to miss doses at home. Still, it only works well when the infection is one the medication is suited to treat. Merck notes that otitis treatment should be based on patient history and cytology, and culture may be needed in more difficult or resistant cases. In other words, Claro can be a practical option, but it works best as part of a diagnosis-driven plan rather than a one-size-fits-all ear treatment.

It is also important to understand what Claro does not do. It does not correct the underlying reason a dog keeps getting ear infections. If allergies, ear canal anatomy, moisture, chronic wax buildup, or middle ear disease are driving the problem, your vet may recommend additional care such as ear cleaning, allergy management, culture testing, oral medication, or referral for advanced ear workup.

Many dogs tolerate Claro well, and in the U.S. field study there were no directly attributable adverse reactions reported in 146 treated dogs. Still, no ear medication is risk-free. The product labeling and post-approval reports describe possible problems including ear discharge, head shaking, ear pain, pinnal irritation, vomiting, hearing changes, ataxia, nystagmus, head tilt, facial nerve signs, dry eye, and tympanic membrane rupture. These are not expected in every dog, but they are important enough that pet parents should know what to watch for.

The biggest practical safety issue is accidental eye exposure. Dogs often shake their heads after ear medication is placed, and splatter from Claro has been linked to eye irritation and corneal ulcers in both people and dogs. That is why the label says administration should be done by veterinary personnel with eye protection and with the dog restrained to reduce head shaking right after treatment. If medication gets into your dog’s eye or your own eye, seek medical or veterinary guidance right away.

Claro also contains a steroid, mometasone furoate. Topical ear steroids can help a painful, swollen ear feel better, but corticosteroids can also have systemic effects in some dogs. The label notes that topical otic corticosteroids have been associated with adrenal suppression and iatrogenic hyperadrenocorticism, and the product should be used with caution in dogs with impaired liver function. Safety has not been established in breeding dogs, pregnant dogs, or lactating dogs.

Call your vet promptly if your dog seems more painful after treatment, cries when the ear is touched, develops a head tilt, stumbles, vomits, seems less able to hear, or has eye pain or discharge. Those signs can suggest irritation, deeper ear involvement, or a problem with the eardrum, and they deserve re-evaluation rather than watch-and-wait care at home.

Claro is not a home-use ear drop for most pet parents. The labeled dosing is a single 1 mL dose placed into each affected ear canal by veterinary personnel. After the solution is instilled, the base of the ear is gently massaged to help distribute the medication. The product is intended to provide a 30-day duration of effect, so daily redosing at home is not part of the standard labeled plan.

Before your vet chooses Claro, the ear should be examined carefully. The eardrum needs to be intact, because the product should not be used in dogs with known tympanic membrane perforation. In many cases, your vet will also perform ear cytology to look for yeast, cocci, rods, inflammatory cells, or mites. That step matters because not every ear infection has the same cause, and chronic or resistant infections may need culture, different medication, or treatment of middle ear disease.

Ear cleaning is another important point. In general, infected ears often need debris removed so medication can contact the diseased tissue. However, with Claro specifically, cleaning the ear after dosing may reduce effectiveness. If your dog needs ear cleaning, your vet will usually decide whether to clean before treatment and whether the canal is too swollen or painful for routine home cleaning afterward. Do not add over-the-counter ear cleaners, vinegar, peroxide, or other products unless your vet tells you to.

At home, your role is mostly observation. Watch for improvement in odor, discharge, scratching, and head shaking over the next days to weeks, and follow through on any recheck your vet recommends. If signs return before the 30-day period is over, or if your dog has recurrent infections, your vet may want repeat cytology, allergy workup, culture testing, or a different treatment path rather than repeating the same medication automatically.

There is limited published interaction data specific to Claro, but that does not mean interactions are impossible. Because it contains an antibiotic, an antifungal, and a corticosteroid, your vet should know about every medication and supplement your dog receives, including allergy drugs, steroids, medicated shampoos, ear cleaners, and any recent oral antibiotics or antifungals. This helps your vet choose a plan that fits the whole patient, not only the ear.

The most important practical interaction issue is with other ear products. Some cleansers can weaken or deactivate topical medications, and VCA advises asking whether there should be a delay between cleaning and applying ear medication. With Claro, the label specifically warns that cleaning the ear after dosing may affect effectiveness. Adding other ear drops, flushes, or home remedies on top of Claro without veterinary guidance can also increase irritation and make it harder to judge whether the treatment is working.

Steroid exposure is another consideration. Claro contains mometasone, so your vet may be more cautious if your dog is already receiving other corticosteroids or has conditions where steroid exposure matters, such as certain endocrine concerns, poorly controlled infections, or liver disease. The label also advises caution in dogs with impaired hepatic function. If your dog has a history of chronic recurrent ear disease, resistant infections, or suspected middle ear involvement, your vet may choose culture-based therapy or a different medication instead of layering treatments.

A good rule for pet parents is this: do not start, stop, or add ear products around the time of Claro treatment unless your vet says to. If another clinician prescribed a skin, allergy, or infection medication recently, mention it at the appointment. That small step can prevent duplicated therapy, unnecessary irritation, and missed clues about why the ear problem started in the first place.