Hi, I took Allegra for a two-week period while visiting family, in order to prevent possible asthmatic reaction to their cats. I then developed sudden hearing loss in the right ear (muffled hearing, sense of slight pressure, metallic sounds). This was three weeks ago. I have now had hearing loss documented by an audiologist--two days ago--and tomorrow I am to see an ENT specialist. I m just wondering if the ear congestion listed as a side-effect of Allegra could have a possible connection to my hearing loss? Thank you.