Not sure how reliable this is but....
http://www.after50health.com/are-yo...ations-could-trigger-hearing-loss-in-you.html
Also it seams Rush was on Vicodin AND Oxy so the vike might have caused the hearing loss he has.
But the article also says that Oxycontin has been linked to hearing loss, but also NSAIDS, so vicodin might be a double wammy with APAP and hydrocodone in it, both being linked to hearing loss.
Kind of scary shit tho...guh
Another more reliable report...
http://www.painphysicianjournal.com/2007/may/2007;10;467-472.pdf
If you google opiate related hearing loss a lot of hits come back with some good info.