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Drug Interactions between dexmethylphenidate and fosphenytoin

This report displays the potential drug interactions for the following 2 drugs:

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Interactions between your drugs

Minor

fosphenytoin dexmethylphenidate

Applies to: fosphenytoin and dexmethylphenidate

According to the manufacturer, methylphenidate may inhibit the metabolism of anticonvulsants including phenobarbital, phenytoin, and primidone. There have been only isolated case reports of phenytoin intoxication during coadministration with methylphenidate and none for the other anticonvulsants. Moreover, two studies found little or no effect of methylphenidate on plasma phenytoin concentrations. Thus, available evidence does not seem to support a clinically significant drug interaction. Nevertheless, it may be appropriate to monitor the pharmacologic response to these anticonvulsants more closely whenever methylphenidate (racemic) or dexmethylphenidate (the more pharmacologically active d-enantiomer) is added to or withdrawn from therapy, and the anticonvulsant dosage adjusted as necessary.

References (6)
  1. Kupferberg HJ, Jeffery W, Hunninghake DB (1972) "Effect of methylphenidate on plasma anticonvulsant levels." Clin Pharmacol Ther, 13, p. 201-4
  2. Garrettson LK, Perel JM, Dayton PG (1969) "Methylphenidate interaction with both anticonvulsants and ethyl biscoumacetate." JAMA, 207, p. 1053-6
  3. Mirkin BL, Wright F (1971) "Drug interactions: effect of methylphenidate on the disposition of diphenylhydantoin in man." Neurology, 21, p. 1123-8
  4. Ghofrani M (1988) "Possible phenytoin-methylphenidate interaction." Dev Med Child Neurol, 30, p. 267
  5. (2001) "Product Information. Ritalin (methylphenidate)." Novartis Pharmaceuticals
  6. (2001) "Product Information. Focalin (dexmethylphenidate)." Mikart Inc

Drug and food interactions

No alcohol/food interactions were found. However, this does not necessarily mean no interactions exist. Always consult your healthcare provider.

Therapeutic duplication warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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