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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Tinnitus suppression by intravenous lidocaine in relation to its plasma concentration.

In a double-blind controlled trial in nine patients with tinnitus we measured the lidocaine plasma concentrations during and after intravenous administration of lidocaine or placebo and scored the level of tinnitus on a visual analog scale. No patient showed any effect during the placebo infusion. Administration of lidocaine resulted in total suppression or suppression to a non-annoying level of tinnitus in five patients, slight suppression but still annoying tinnitus in two patients, and worsening tinnitus in one patient. No effect of lidocaine was observed in one patient. Most relief was obtained at plasma concentrations between 1.5 and 2.5 micrograms/ml. In this concentration range a significant (p < 0.05) effect of lidocaine on tinnitus was observed. However, notable side effects were observed at plasma concentrations greater than 2.0 micrograms/ml. The effect persisted until plasma levels of about 0.5 microgram/ml were reached. A large variability in the effects existed because of variations in lidocaine kinetics and because of the presumed psychologic components of tinnitus.[1]

References

  1. Tinnitus suppression by intravenous lidocaine in relation to its plasma concentration. den Hartigh, J., Hilders, C.G., Schoemaker, R.C., Hulshof, J.H., Cohen, A.F., Vermeij, P. Clin. Pharmacol. Ther. (1993) [Pubmed]
 
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