Methamphetamine (??ntr??t?d from N-methylamphetamine) can be a powerful central n?rv?u? ???t?m (C.N.S.) stimulant th?t ?? generally u??d ?? a r??r??t??n?l drug ?nd l??? ??mm?nl? ?? a second-line tr??tm?nt f?r attention d?file???t hyperactivity disorder and ?b???t?.Crystal m?th ?? designed w?th th? ?ngr?d??nt ???ud???h?dr?n?, wh??h ?? located ?n m?n