Psychedelics and alcohol
Because of the psychedelic you have energy and you are less tired. As a result, you may feel the sedating effects of the alcohol less and you may have a tendency to drink more alcohol. Be careful, because this can cause an extra large hangover. So do not drink alcohol when you are tripping or agree with yourself or your friends in advance how many glasses of alcohol you want to drink. This prevents headaches the next day and is better for your health!
It can also make the trip more vague. You have less control over the trip because of the alcohol. This gives a greater chance of a difficult experience. You are disinhibited by the alcohol. You may end up doing things that are stupid or dangerous. Especially if you can no longer think logically because you are tripping, this can lead to dangerous or unpleasant situations.