Answer:
Found this on google, "Yes, alcohol can dehydrate you. Alcohol is a diuretic. It causes your body to remove fluids from your blood through your renal system, which includes the kidneys, ureters, and bladder, at a much quicker rate than other liquids. If you don't drink enough water with alcohol, you can become dehydrated quickly."
This is from my notes, "Consuming large amounts of alcohol can cause dehydration, increased thirst, headaches, and a dry mouth. Because alcohol blocks the production of the hormone that helps the body retain a healthy amount of fluids, more urine is produced than normal. Water levels in the body can become dangerously low. A hangover, an unpleasant condition experienced by those that drink too much, is caused by a decrease in the liquids surrounding the brain. Headaches, pain behind the eyes, and nausea are some of the side affects of alcohol abuse." So, the answer to your question is large amounts of alcohol can cause dehydration.
Hope this helps!
Have a great day and stay safe! :) :D