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If your husband has no other symptoms like giddiness, sweating, flushing
of face or loss of conscious , but only palpitations , then it is fine, but try to measure his pulse rate, if less than 100 nothing to worry ,generally alcohol causes some changes in the heart and sympathetic system .
Make sure he has had food or something to drink , do not keep him unfed,if there is any other symptoms , take him to a doctor if needed.
Motivate him to quit this habit.