For example, someone i knew 10 years ago told me they’d take 50mg of dexamphetamine one weekend (10 pills), then 100mg the next (20 pills)

a normal starting dose is like, 5mg or 10mg at a time (1 or 2 pills). It’s such a low dose I’ve heard people say they would be scared to take it because it (apparently) correlates with psychosis, which i doubt