AM-111 in the Treatment of Acute Inner Ear Hearing Loss

Inclusion Criteria: 1. Unilateral ISSNHL with onset within 72 hours prior to study treatment; 2. Mean hearing threshold of equal to or worse than (≥) 60 dB averaged across the 3 most affected contiguous air conduction audiometric pure tone frequencies ("pure tone average", PTA);\* 3. Mean hearing loss of equal to or worse than (≥) 40 dB averaged across the air conducted PTA frequencies compared with the unaffected contralateral ear or reference values from a pre-existing audiogram or ISO 7029;2000 norm values in case of asymmetric hearing prior to the ISSNHL incident; 4. Age ≥ 18 and ≤ 65 years on the day of screening; Other protocol-defined inclusion criteria may apply. Exclusion Criteria: 1. Bilateral ISSNHL; 2. Acute hearing loss from noise trauma, barotrauma or head trauma; 3. History of autoimmune hearing loss, radiation-induced hearing loss, endolymphatic hydrops or Menière's disease in the affected ear; 4. History of chronic inflammatory or suppurative ear disease or cholesteatoma in the affected ear; 5. History of acoustic neuroma or other retrocochlear damage in the affected ear; 6. History of otosclerosis in the affected ear; 7. Suspected perilymph fistula or membrane rupture in the affected ear; 8. Congenital hearing loss; 9. History of ISSNHL in the past 2 years; 10. Otitis media or otitis externa that is ongoing or ended within 7 days prior to study treatment; Other protocol-defined exclusion criteria may apply.