Nervous System Home > Phenytoin Dosing
Phenytoin dosing guidelines vary from one product to the next, since the various forms of phenytoin are not interchangeable. The recommended starting phenytoin dosage for extended-release capsules is 100 mg three times daily or 300 mg once daily. With the chewable tablets, the usual starting dose is 100 mg three times a day. With the oral suspension form of phenytoin, dosing typically starts at 125 mg three times per day.
- The particular phenytoin product
- Your age and weight
- The amount of phenytoin in your blood (measured using a blood test)
- Other medications you may be taking
- Other medical conditions you may have.