When people drink alcohol, they may temporarily feel elated and happy, but they should not be fooled. As blood alcohol level rises, the effects on the body—and the potential risks—multiply.
Inhibitions and memory become affected, so people may say and do things that they will regret later and possibly not remember doing at all.
Decision-making skills are affected, so people may be at greater risk for driving under the influence—and risking an alcohol-related traffic crash—or making unwise decisions about sex.
Aggression can increase, potentially leading to everything from verbal abuse to physical fights.
Coordination and physical control are also impacted. When drinking leads to loss of balance, slurred speech, and blurred vision, even normal activities can become more dangerous.
Consuming a dangerously high amount of alcohol can also lead to alcohol overdose and death. When people drink too much, they may eventually pass out (lose consciousness). Reflexes like gagging and breathing can be suppressed. That means people who have had too much alcohol could vomit and choke, or just stop breathing completely. Vulnerability to overdose increases if the teen is already on a sedative-hypnotic (such as Valium, Xanax, or Benadryl) or pain medication.
Information extracted from: https://teens.drugabuse.gov/