Patients with chronic idiopathic subjective tinnitus, since at least 1 year, re recruited from our Ear, Nose and Throat (ENT) clinic. After verification of inclusion and exclusion criteria, patients consenting to enter the study are assigned randomly to one of the following groups: 1- Sulodexide 25 mg for 40 days 2- Placebo for 40 days. Clinical evaluation of the patient is performed; tinnitus is assessed according to Tinnitus Handicap Inventory score, Mini Tinnitus Questionnaire score. Adverse effects are also noted. Patients are followed at 40 days post-treatment and outcome measures are assessed.