Answer
After Pro-Epanutin (fosphenytoin sodium) administration, immunoassays may significantly overestimate blood phenytoin concentrations because they cross-react with fosphenytoin before its conversion to phenytoin is complete.
Sources for this answer
- Pro-Epanutin Concentrate for Infusion / Solution for InjectionPfizer Limited · emc · SmPC §4.2 Posology and method of administration · Version 26Document updated
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