There is a deadly side to alcohol. Forty percent of all traffic-related deaths are related to alcohol. People who drink heavily often develop medical, family, and emotional problems. Alcohol will broken down in the liver. Regular heavy drinking is toxic to the heart muscle and can cause congestive heart failure [1]. And binge drinking can produce sudden cardiac arrhythmias, even in previously healthy people. And:

Driving accidents
Even at low blood alcohol concentrations, alcohol impairs your judgment and dulls [2] your reflexes. If you weigh 140 pounds, just two drinks are enough to increase your chances of having a driving accident.

Interactions with medications
The effects of alcohol are much greater if you are taking sedatives, sleeping pills, anticonvulsants, antidepressants, antianxiety drugs, or some painkillers. It's best not to drink after taking any medicine, especially if you plan to drive.

Cancer
If you drink heavily, you are far more likely to get cancer of the esophagus, mouth, pharynx, larynx, or liver. Women who drink three to nine drinks a week are 50 percent more likely to develop [3] breast cancer than women who drink fewer than three drinks a week.

Fetal alcohol syndrome
When mothers drink even moderate amounts of alcohol during pregnancy, their babies are smaller and shorter. Babies of moms who drink heavily during pregnancy often have birth defects that lower their IQ [4] throughout their lives. Nobody knows exactly how much alcohol is safe during pregnancy. It's best not to drink any alcohol until after the baby is born.