Study of BGG492 in Patients With Chronic Subjective Tinnitus

Inclusion Criteria: * Patients diagnosed with THI (Tinnitus Handicap Inventory) severity grade 3, 4 or 5 (moderate, severe or catastrophic), chronic (\> 6 months and \< 36 months) subjective tinnitus * Willing to abstain from activities that require focused attention, e.g. driving a car or other vehicles, operating machines or engaging in potentially dangerous activities that require focused attention and intact physical balance * Willing and able to refrain from engaging in activities or work involving loud noise exposure Exclusion Criteria: * Patients diagnosed with tinnitus of THI severity grade equal to 2 or 1 * Patients with diagnosis of intermittent or pulsatile tinnitus * Patients who have tinnitus as a concomitant symptom of a treatable otological disease (such as otitis media, Menière's disease, otosclerosis), neurological tumors or/and have temporo-mandibular joint disorders * Patients with a history of frequent middle ear infections (\> 3 infections per year during the last 3 years) * Patients with diagnosed anxiety disorders, depression, schizophrenia or other significant psychiatric diseases requiring current drug treatment or patients who required treatment in the previous 3 months for these diseases. * Patients with current unilateral or bilateral hearing loss of 75 dB or more in one or more tested frequencies (125 Hz, 250 Hz, 1 kHz, 2 kHz, 4 kHz, 6 kHz, 8 kHz) * Patients with Vestibular Schwannoma * Patients with a cochlear implant * Patients with regular intake of central nervous system acting drugs for the treatment of tinnitus in the previous 6 months prior to initial dosing Other protocol-defined inclusion/exclusion criteria may apply