An elderly man who was a heavy drinker in his youth drank 3 vodka and redbull in 15 minutes. He is at home on the couch with two friends.
A risk drinking so much alcohol so fast is that he could go back to being an alcoholic. Also being an elderly he is put at higher risk of having a stroke or even dying. The sudden amount of alcohol intake will shock the body leading to some pretty serious outcomes.
Instead of drinking so much so fast he could have a glass of water between each drink. Drinking this way won't dehydrate his body as much.