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RITALIN AND RITALIN-SR (METHYLPHENIDATE) TABLETS: CLINICAL PHARMACOLOGY
Ritalin (Methylphenidate) is a mild central nervous system stimulant.
The mode of action in man is not completely understood, but Ritalin presumably activates the brain stem arousal system and cortex to produce its stimulant effect.
There is neither specific evidence which clearly establishes the mechanism whereby Ritalin (Methylphenidate) tablets produces its mental and behavioral effects in children, nor conclusive evidence regarding how these effects relate to the condition of the central nervous system.
Effects on QT Interval
The effect of Focalin-XR (Dexmethylphenidate, the pharmacologically active D-enantiomer of Ritalin) on the QT interval was evaluated in a double-blind, placebo- and open label active (moxifloxacin)controlled study following single doses of Focalin-XR 40 mg in 75 healthy volunteers. ECGs were collected up to 12 h post-dose. Frederica's method for heart rate correction was employed to derive the corrected QT interval (QTcF). The maximum mean prolongation of QTcF intervals was < 5 ms, and the upper limit of the 90% confidence interval was below 10 ms for all time matched comparisons versus placebo. This was below the threshold of clinical concern and there was no evident-exposure response relationship.
Ritalin in the SR tablets is more slowly but as extensively absorbed as in the regular tablets. Relative bioavailability of the SR tablet compared to the Ritalin tablet, measured by the urinary excretion of Ritalin major metabolite (alpha-phenyl-2-piperidine acetic acid) was 105% (49%-168%) in children and 101% (85%-152%) in adults. The time to peak rate in children was 4.7 hours (1.3-8.2 hours) for the SR tablets and 1.9 hours (0.3-4.4 hours) for the tablets. An average of 67% of SR tablet dose was excreted in children as compared to 86% in adults.
In a clinical study involving adult subjects who received SR tablets, plasma concentrations of Ritalin's major metabolite appeared to be greater in females than in males. No gender differences were observed for Methylphenidate Hydrochloride (Ritalin) plasma concentration in the same subjects.
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