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combining an inner-ear lidocaine injection with an intravenous dose of the same drug may shush the ear-ringing. in a study of 68 patients at the Shea ear clinic in Memphis, the technique brought at least partial relief more than 70% of the time for both hightone and lowtone tinnitus. this treatment has been very successful for people whose tinnitus hasnt responded to anything else says DR.JOHN J SHEA JR. MD,lead study author and chief otologic surgeon at the clinic. the benefits of the double-lidocaine therapy are usually permanent, but can be repeated safely if nessesary. presented to the american otological society, may 2000. article by jordan matus. hope this helps