Concerta and Phenytoin Chewable Tablets
Determining the interaction of Concerta and Phenytoin Chewable Tablets and the possibility of their joint administration.
In the database of official manuals used in the service creation an interaction registered by statistical results of studies was found, which can either lead to negative consequences for the patient health or strengthen a mutual positive effect. A doctor should be consulted to address the issue of joint drug administration.
Consumer:Consumer information for this minor interaction is not currently available. Some minor drug interactions may not be clinically relevant in all patients. Minor drug interactions do not usually cause harm or require a change in therapy. However, your healthcare provider can determine if adjustments to your medications are needed.
Professional: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methylphenidate (racemic) or dexmethylphenidate (the more pharmacologically active d-enantiomer) is added to or withdrawn from therapy, and the anticonvulsant dosage adjusted as necessary.
- Kupferberg HJ, Jeffery W, Hunninghake DB "Effect of methylphenidate on plasma anticonvulsant levels." Clin Pharmacol Ther 13 (1972): 201-4
- Garrettson LK, Perel JM, Dayton PG "Methylphenidate interaction with both anticonvulsants and ethyl biscoumacetate." JAMA 207 (1969): 1053-6
- "Product Information. Focalin (dexmethylphenidate)." Mikart Inc, Atlanta, GA.
- "Product Information. Ritalin (methylphenidate)." Novartis Pharmaceuticals, East Hanover, NJ.
- Ghofrani M "Possible phenytoin-methylphenidate interaction." Dev Med Child Neurol 30 (1988): 267
- Mirkin BL, Wright F "Drug interactions: effect of methylphenidate on the disposition of diphenylhydantoin in man." Neurology 21 (1971): 1123-8
Generic Name: methylphenidate
Brand name: Aptensio XR, Concerta, Cotempla XR-ODT, Jornay PM, Metadate CD, Metadate ER, Methylin, QuilliChew ER, Quillivant XR, Ritalin, Ritalin LA, Ritalin SR, Adhansia XR, Relexxii, Daytrana, Methylin ER
Synonyms: n.a.
Generic Name: phenytoin
Brand name: Dilantin, Phenytek, Dilantin Infatabs, Phenytoin Sodium, Prompt
Synonyms: Phenytoin
In the course of checking the drug compatibility and interactions, data from the following reference sources was used: Drugs.com, Rxlist.com, Webmd.com, Medscape.com.
- Concerta-Phenytoin Extended-Release Capsules
- Concerta-Phenytoin Infatabs
- Concerta-Phenytoin injection
- Concerta-Phenytoin Intravenous
- Concerta-Phenytoin Oral Suspension
- Concerta-Phenytoin Sodium
- Phenytoin Chewable Tablets-Conestat alfa
- Phenytoin Chewable Tablets-Conex
- Phenytoin Chewable Tablets-Conex Cold/Allergy
- Phenytoin Chewable Tablets-Congestion Relief
- Phenytoin Chewable Tablets-Conivaptan
- Phenytoin Chewable Tablets-Conivaptan Hydrochloride