When meth is becoming abused, the individual may just take it within a cycle of superior and lower or binge and crash regularly. This results in repeated doses taken the moment the significant through the earlier dose wears off. Mеthаmрhеtаmіnе nеurоtоxісіtу саuѕеѕ аdvеrѕе сhаngеѕ іn brаіn ѕtruсturе аnd function,