4. Discussion
IT therapy was first reported by Fradis in 1985, then two reports used IT dexamethasone or lidocaine in Ménière disease, and a lot of patients got an improvement in vertigo and tinnitus[4,6]. neither of the two reports mentioned the complications of IT, and both of them thought the IT was safe and effective. However, more and more research found that this technique may cause some adverse side effect in recent years.