Drinking alcohol after a workout can cancel out any physiological gains you might have received because short-term alcohol use can impede muscle growth, while long-term alcohol use diminishes ‘protein synthesis’ resulting in a decrease in muscle build-up.
If you have alcohol 24 hours before exercising you are more likely to develop muscle cramps. Following an episode of heavy drinking, you should have a 48 hour break without alcohol to allow time for your body tissues to recover.