Is Sudden Tapering Of Xanax Dosage Safe?

I have been taking xanax for about 6 months. I am taking 3 per day, of the 1mg variety. I am very careful to take only the amount prescribed, but for some reason I am going to run out before my fill date. I Know its not safe to suddenly discontinue use of xanax, so is it safe for me to do a quick taper until I can get my refill - I only have 6 pills left and I have days until I can get my refill. Also, could butabutal stave off the withdrawl of xanax? Thanks!