This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in


Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Phenytoin is an anticonvulsant and cardiac depressant used in the treatment of all forms of epilepsy except petit mal and as an antiarrhythmic, where it is particularly useful against arrhythmias caused by cardiac glycosides.

The mode of action of phenytoin is to block repetitive firing of neurons by action on voltage-sensitive Na channels.

It has little effect on myoclonus.

The summary of product characteristics should be consulted before prescribing this drug.

Related pages

Create an account to add page annotations

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