It is forbidden to consume alcohol, drugs or any pain relievers 24 hours before the tattoo.
Alcohol thins the blood and raises blood pressure. The problem with drugs is that they can reverse the situation. For example. with marijuana, it happens that the client vomits. Heart problems can also occur. There is also the possibility of reducing blood clotting with pain relievers. Therefore, the best thing you can do for yourself is to arrive at the tattoo relaxed, eaten, and without using any drugs.
The right tattoo artist shouldn't even tattoo you when he finds out any of these facts and he should send you home.