This is a protocol for a Cochrane Review (Intervention). The objectives are as follows:

To assess the efficacy, the effectiveness and the risks of adverse events of intratympanically applied glucocorticoids versus placebo therapy, versus no therapy or versus systemic application of glucocorticoids for treating unilateral sudden idiopathic sensorineural hearing loss, when given as a primary therapy or as a secondary (i.e. rescue or salvage) therapy after failure of systemic treatment.