Drinking alcohol can have short term effects like decreased anxiety and impaired motor skills at low doses, but higher doses lead to slurred speech, unconsciousness, and impulsive behavior. Long term heavy drinking is linked to increased risk of health issues like heart disease, various cancers, and mental decline including depression, memory loss, and potentially dementia due to the toxic effects of alcohol on the brain and body over time. Excessive drinking may also negatively impact relationships and family dynamics through mood changes and aggression.