I have the same concerns about the side effects of many medications. Whenever I am prescribed something new, I diligently sit down and read the WHOLE long description of the med that is handed to me with the package. If it is not there, I ask the pharmacist to print it out for me. Some roll their eyes, but they do it - because by law they must.

Then, if I am still concerned about interaction with another medication, or one of the listed side effects, I will use drugs.com - it has a section that reports serious side effects and the statistical likeliness of them and all potential interactions.

So, I did that for metoprolol and found tinnitus listed as a very rare side effect - less than 1 in 10,000 patients. And no listing for hearing loss. There is however, a long list of other medications that can interact with it, including things like ibuprofen and calcium supplements as well as many prescription drugs.

So, what to do now? Review what else is going on in your life, what other meds you take, and maybe consult your doctor?
Sue