I cannot make any concrete recommendations without examination. The decision whether to change your medication should be made in conjunction with your neurologist.
The GGT is not specific to the liver. There are other conditions that can raise the GGT level. Pancreatic disease as well as
biliaryBile duct obstruction
Biliary atresia
Biliary obstruction - series
Biliary stricture
Biopsy - biliary tract
Gallbladder disease
Gallbladder radionuclide scan
Primary biliary cirrhosis disease can raise the GGT level. Imaging studies and other tests (i.e. CT scan and pancreatic enzyme levels) can be obtained to evaluate this possibility.
As you surmised, alcohol can also increase the GGT levels.
If everything has been evaluated for, then that leaves the Dilantin. Studies have shown that there is a connection between Dilantin and an isolated elevation in GGT level. In this scenario, it would be unlikely that the GGT would decrease if the Dilantin is continued.
These options can be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_b