Otomax is applied directly into your dog’s ear canal, typically twice a day for 7 days. The process is straightforward once you know the right dosage and technique, but a few details, like cleaning the ear beforehand and massaging the base afterward, make a real difference in how well the medication works.
What Otomax Does
Otomax is a combination ear medication prescribed for outer ear infections in dogs. It contains three active ingredients that work together: an antibiotic that kills a wide range of bacteria, an antifungal that targets yeast and fungal organisms, and a steroid that reduces the inflammation, swelling, and itching that make ear infections so miserable for your dog. This combination means it covers the most common causes of ear infections in one product.
How Much to Apply
The dose is based on your dog’s weight:
- Dogs under 33 pounds (15 kg): 4 drops in the affected ear, twice daily
- Dogs over 33 pounds (15 kg): 8 drops in the affected ear, twice daily
The standard treatment course is 7 days. Even if your dog’s ear looks better after a few days, finish the full course. Stopping early can allow bacteria or yeast to bounce back, often in a form that’s harder to treat the second time around.
Cleaning the Ear First
Cleaning the ear before applying Otomax helps the medication reach the ear canal lining instead of sitting on top of debris and discharge. Use a vet-recommended ear cleaning solution, not water or hydrogen peroxide. Squeeze a small amount into the ear canal, gently massage the base of the ear for 20 to 30 seconds, and let your dog shake their head. Then wipe away any loosened debris with a cotton ball or soft gauze.
One important exception: if your dog’s ear is extremely painful or badly inflamed, skip the cleaning for the first few days. The medication itself will start reducing pain and swelling, and you can begin cleaning once your dog can tolerate it. Cornell University’s veterinary team specifically recommends delaying at-home cleanings when a severe infection is present until the medication has had a chance to help.
Step-by-Step Application
Once the ear is clean (or if your vet has told you to skip cleaning), you’re ready to apply the medication. Try to do this at roughly the same times each day, about 12 hours apart.
Start by gently lifting the ear flap so you can see into the ear canal. Hold the Otomax tube or bottle at a slight angle and place the tip just inside the opening of the ear canal. You don’t need to push it deep. Squeeze the prescribed number of drops into the canal, then remove the tip.
Now fold the ear flap down over the canal opening and massage the base of the ear with your thumb and fingers for about 30 seconds. You should hear a soft squishing sound as the medication moves deeper into the canal. This step is critical. Without the massage, much of the ointment stays near the surface and never reaches the infected tissue below.
Your dog will almost certainly want to shake their head after this. That’s fine, but try to hold the ear flap in place during the massage to keep as much medication inside as possible. A little bit of ointment flying out during the shake is normal.
If both ears are being treated, repeat the entire process on the other side. Wipe the applicator tip clean between ears to avoid transferring infection from one to the other.
Keeping Your Dog Still
Dogs with sore ears often resist having them touched, so positioning matters. Smaller dogs can sit in your lap or on a table with a non-slip surface. For larger dogs, have them sit or lie down on the floor while you kneel beside them. If your dog tends to squirm, having a second person gently hold their head can make the process smoother and faster for everyone.
Offering a small treat right after each application helps build a positive association. After a day or two, most dogs tolerate the routine much better, especially once the medication starts relieving their discomfort.
Signs of a Problem
Otomax contains an antibiotic (gentamicin) that can cause damage to the inner ear if it reaches past a ruptured eardrum. This is why your vet should examine the ear before prescribing it. If the eardrum is intact, the risk is very low. But if your dog develops any of the following signs during treatment, stop applying the medication and contact your vet:
- Head tilting to one side that wasn’t present before treatment
- Loss of balance or stumbling, especially circling in one direction
- Rapid eye movements (eyes flicking back and forth horizontally)
- Nausea or refusal to eat
- Sudden loss of responsiveness to sounds
These are signs of inner ear damage, which can appear quickly. According to veterinary research published through the Veterinary Information Network, vestibular damage can show up within minutes of the medication reaching the inner ear. Balance-related signs like head tilting and stumbling tend to appear first. Hearing loss is harder to spot early because dogs compensate well, but you may notice an unusually strong startle response to sounds, or your dog may seem disoriented and withdrawn.
Tips for the Full 7 Days
Store the tube at room temperature and keep the cap on between uses. Don’t let the applicator tip touch anything other than the inside of the ear canal, as contamination can introduce new bacteria into an already vulnerable area.
Resist the urge to extend treatment beyond 7 days without veterinary guidance. The steroid component, while excellent at reducing inflammation short-term, can thin the skin and suppress local immune function if used too long. If your dog’s ear still looks red, swollen, or discharge-heavy after finishing the course, the infection may need a different approach rather than more of the same medication.
During the treatment period, keep your dog’s ears dry. Skip baths, swimming, and any activity that could introduce water into the ear canal. Moisture creates exactly the warm, damp environment that bacteria and yeast thrive in.