The study was carried out on 44 patients suffering from prominent unilateral idiopathic subjective non-pulsatile tinnitus (IST) attending to the outpatient clinic of otorhinolaryngology department of the Tanta University Hospital, from March 2015 to October 2015. They were 18 male and 26 female, with age ranged from 30 to 63 years old (mean 48.909±7.758). Patients were equally divided into two groups (A and B). Group A was injected by combined Lidocaine 2% and dexamethasone 8mg/2ml. Group B was injected only by dexamethasone 8mg/2ml. Exclusion criteria included Extreme age, pulsatile tinnitus, objective tinnitus and ear inflammation.