It is generally seen that alcohol, sedatives, and
tranquilizers can increase the drowsiness
of meclizine and
should be avoided while taking it.So pls ask your father to abstain from it.Alcohol allergy presents in the form of hives,flushing,swelling,itching,dizziness,vomitings,respiratory difficulty etc. It is usually not the alcohol that produces the allergic reaction to the wine or beer.