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Hi Dr Nagler--You indicated that an aminoglycoside (e.g., neomycin as part of neo-poly-dex mix) would increase tinnitus only if introduced by vein. Would that drug entering the tear duct and thus into the blood stream be equivalent to systemic introduction via the vein?

I am experiencing an increase in tinnitus after 4 days (3x/d) of Neo-Poly-Dex eye drops (neomycin, dexamethasone) for chalazion. Was operating under view that eye drops do not have systemic impact and had to worry about impact on tinnitus only where AB drugs taken by oral or injection route...