Psychedelics do tend to cause dehydration as the body tries to filter them out, and if you don't have a steady fluid intake you can dry out pretty badly before

Psychedelics do tend to cause dehydration as the body tries to filter them out, and if you don't have a steady fluid intake you can dry out pretty badly before it's done. (Source: I take LSD frequently) I'd be hesitant to connect that to internal bleeding right off the bat though. Definitely would not trust claims that internal bleeding is a first-order effect of the drug.