Depending on how much is taken and the physical condition of the individual, alcohol can cause:
Slurred speech
Drowsiness
Vomiting
Diarrhea
Upset stomach
Headaches
Breathing difficulties
Distorted vision and hearing
Impaired judgment
Decreased perception and coordination
Unconsciousness
Anemia (loss of red blood cells)
Coma
Blackouts (memory lapses, where the drinker cannot remember events that occurred while under the influence)