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asked 3 months ago
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Following oral administration of methylphenidate, 78 to 97% of the dose is excreted in the urine and 1 to 3% in the feces in the form of metabolites within 48 to 96 hours. The main urinary metabolite is ritalinic acid (alpha-phenyl-2-piperidine acetic acid, PPAA); unchanged methylphenidate is excreted in the urine in small quantities (
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