Blood
alcohol levels were raised by 17%, and remained elevated for five times longer than normal, in patients taking
verapamil.
Information about this interaction is limited and unconfirmed. An
alcohol concentration rise of almost 17% is quite small, but it could be enough to raise legal blood levels to illegal levels if driving. Moreover, the intoxicant effects of
alcohol may persist for a much longer period of time. Warn patients of these potential effects.