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Anonymous
Depending on your bodies metabolic rate, Methylphenidate will probably stay in your system 1-2 days as far as being detected by a urine analysis. For more info check http://health.rutgers.edu/drugs/DrugChart.htm.
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Until you sweat it out or buy yourself a drug blocking kit from docter herman's or such.
Ritalin (methylphenidate) stays in your system for 4 hours, while Concerta (methylphenidate ER) stays in your system for 12 hours.
Methylphenidate