Isoniazid slightly increases the hazards of driving after drinking
alcohol. Isoniazid- induced
hepatitis may also possibly be increased, and the effects of
isoniazid are possibly reduced, by
alcohol.
There appear to be some extra risks for patients taking
isoniazid who drink, but the effect does not appear to be large. Patients should nevertheless be warned about the potential adverse effects. The
clinical significance of the other effects are unclear, but it may be prudent to limit
alcohol intake whilst taking
isoniazid.