Xanax is a highly potent benzodiazepine drug that doctors frequently prescribe to treat panic attacks, phobias, and anxiety disorders. Xanax comes in a variety of colors, strengths, and shapes. It is also known as the generic name of Alprazolam. There are several different Alprazolam pills available both by prescription and on the street. These are classified based on dosage or strength. When pills are thin and long, they are referred to as bars. Buy Yellow Xanax Bars Online is a specific form of medication with a 2-mg dose. Yellow Xanax pills are the generic form of Xanax medication and are usually imprinted with the number R 039. These yellow Xanax bars have a strength of 2 milligrams and work similarly to white-colored pills. The color variation is due to various companies manufacturing Xanax tablets.