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Monitoring phenytoin levels

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Therapeutic phenytoin levels are:

10 mg/l to 20mg/l (Note that reference ranges may vary between laboratories and local laboratory reference ranges should be consulted)

Phenytoin levels peak 3 to 9 hours post dose.

Reference:

  1. Doctor (1/8/02), 34.

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