Phenytoin, phenobarbitol and other aromatic drugs typically cause GGT elevations of about twice normal. A mildly elevated GGT level is a typical finding in patients taking anticonvulsants and by itself does not necessarily indicate liver disease (1).
Like the GGT value, the alkaline phosphatase level can become mildly elevated in patients who are taking phenytoin (1).
Reference:
Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.