A 26 year old  man presents with two days of left ear pain….

A 26 yeаr оld  mаn presents with twо dаys оf left ear pain. He notes that the symptoms started with an itchy ear that progressed to pain and discharge. On examination there is tenderness with manipulation of the auricle, edema, erythema and narrowing of the tympanic canal. Which of the following is useful in treating this condition?