Side effects of long term use: cyclobenzaprine 10mg?

Long-term (and some shorter-term) use of some medications can indeed cause Tinnitus. The drug information from your Pharmacy will have the most common adverse and side effects listed, but usually include the disclaimer "This list may not include all possible side effects you may or may not experience with the use of this drug" or similar statement (which goes a long way in preventing lawsuits against them and/or the manufacturer). The only question I have is, was anything added to your drug regimen along or about the time the ringing in the ears commenced, or has anything been changed, such as a dosage increase? The other thing I would say is, check with your doctor, as well as your Pharmacist. Both these professionals should know you well. Have a frank discussion with both about the problem you're experiencing. The pesky ringing in my ears has been going on for 10 years now, and I've adapted to it and actually mostly ignore it. I realize, however, that this could cause some sufferers a real problem, up to and including a serious mental health emergency.