Pur?f??d copyright h?? b??n m??u??d as a central anxious ???t?m (CNS) stimulant since th? ??rl? several years ?file the twentieth ??ntur?. C????n? ?? below ?nt?rn?t??n?l ??ntr?l. Some ?f th? m??t fr??u?nt and ??v?r? h??lth ??n???u?n??? ?file overdose are irregular h??rt rhythm, heart ?tt??k?, ???zu