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Oral antibiotics don't always work with ear infections. Your vet may need to prescribe an ear drop such as Baytril Otic or Otomax in order to clear this up. I would stop the oral antibiotics until such time you can talk with your vet and take your dog in so he/she can determine exactly what is causing the drainage and give you the proper medication to clear it up.
Please let me know if I can help further.