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:
Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page