What is the use of a Green Xanax bar? A tablet of Green Xanax bar usually contains 2mg of the medicine. It is the same strength as to that of the Yellow and White Xanax bar. People should know that 2mg is considered as a higher dose of Xanax bars. https://local.standard.co.uk/company/304e02427b4250a3ea28ebe5e64b68d7