after a long plane flight , hearing in my left ear was severly impaired. the doctor said i had "trama" to my eustacian tube. he prescribed 7 days of an antibiotic & 30 days of "guafin" . it has been 20 days & there has been gradual improvement. i have noticed a loss of appetite & weight loss, i am sleeping less,and it does leave a "vile" aftertaste & dry mouth . but it does work.