I had quit smoking for 45 days now, I had all kinds of withdrawal symtom included anxiety, my Dr. precribed me Alprazolam 0.5mg twice a day as needed,first I toke it one a day,espacialy at night,but the anxiety start to attack me at the day time,too,so I take it as directed. My question to evrybody is, how long do I have to take this type of medications.Any commented will appreciated.Xsmoker.