How can this medicine affect other medicines?
When taken together with the following medicines, the effects of phenytoin may be increased:
alcohol
aspirin
azapropazone
amiodorone
chloramphenicol
metronidazole
fluoxetine
fluvoxamine
tolbutamide
fluconazole
miconazole
zidovudine
benzodiazepines
hypnotics
diltiazem
nifedipine
disulfiram
methylphenidate
cimetidine
sulfinpyrazone
warfarin
oestrogens
isoniazid
phenothiazines
sulphonamides
When taken together with the following medicines the effects of phenytoin may be reduced:
carbamazepine
folic acid
sucralfate
vigabatrin
rifamycins
chronic alcoholism
tricyclic antidepressants
The effects of the following medicines may be reduced when taken together with phenytoin:
anticoagulants such as nicoumalone and warfarin
digoxin
corticosteroids
doxycycline
clozapine
oestrogens and progestogens such as those in the oral contraceptive pill
thyroxine
theophylline
rifampicin
anti-fungal agents
anti-neoplastic agents
The effects of the following medicines may be increased when taken together with phenytoin:
warfarin
The effects of phenytoin on the blood levels of other anticonvulsant medicines are unpredictable.
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