Vyvanse is a stimulant in a class of drugs known as sympathomimetic amines. Scientists aren’t sure exactly how the drug works, but it does stimulate the part of the the nervous system involved in the “flight-or-fight” response. The Food and Drug Administration (FDA) approved Vyvanse in 2007. Shire Pharmaceuticals manufactures the drug. Contat us via the details below if you need some. website: http://medicationkings.net email: info@medicationkings.net phone: +1(503) 985-6723