Phenytoin
20 mg/kg IV no faster than 50 mg/minute, with ECG and BP monitoring.
On this page
Dose
20 mg/kg IV in 0.9% saline at no more than 50 mg/minute (1 mg/kg/minute in children, max 50 mg/minute), then maintenance by levels.
Cautions
Frequently asked questions
How fast can phenytoin be infused?
No faster than 50 mg per minute in adults.
Used in these guides
Sources
Doses on this page are typical doses from the sources above. Always confirm with a current drug reference, the product leaflet and your hospital protocol, especially in children, pregnancy and kidney or liver disease.
For FCPS Part 1
Revising for FCPS Part 1? Phenytoin is covered in our textbook chapter Pharmacokinetics and half-life, with practice MCQs.