A sequential double blind cross-over trial of tocainide hydrochloride, an oral analogue of lignocaine, is reported. The dosage of tocainide hydrochloride ranged from 200-600 mg daily. Of the 32 patients who completed the trial, 1 had complete relief and 2 had partial relief of their tinnitus whilst taking tocainide. An increased incidence of side-effects in patients taking tocainide was noted, in particular, headache, dizziness, nausea and skin rashes.