For yeast infections Otomax (your prescription was a generic for this, but same thing) is usually prescribed, with administration twice a day, for 14 days. Once in the morning once in the evening. With flushing before the morning application. Flushing with a good ear cleaner with a drying agent. At times a vet will prescribe Otocalm to flush with.
However, at times some dogs are resistent to this antibiotic. I have a girl, with yeast infection that was resistent to the Otomax.....The vet prescribed Tresiderm....she was cleared within 2 days. This after two cycles of the Otomax didn't work.
There are other things that work too. Panalog being one. An all purpose non oral antibiotic.l
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