A 1-Year Safety Study of OTO-104 in Subjects With Unilateral Meniere's Disease Located in United Kingdom

Inclusion Criteria includes, but is not limited to: * Subject has a diagnosis of definite unilateral Meniere's disease. * Subject agrees to maintain their current standard of care treatments for Meniere's disease while on-study. Exclusion Criteria includes, but is not limited to: * Subject is pregnant or lactating. * Subject has a history of immunodeficiency disease. * Subject has a history of previous endolymphatic sac surgery. * Subject has a history of previous use of intratympanic gentamicin in the affected ear. * Subject has a history of drop attacks. * Subject has experienced an adverse reaction to intratympanic injection of steroids.