Why go so old school? People seize up on them things. Seroquel or zyprexa would probably be the most tolerated anti-psychotic without all the cramping and weird side effects. Seroquel would probably be better because it starts working faster. It's not anti-psychotic until around 200 mg but 100 mg should be plenty for the average person to abort a trip and go to sleep. But, as you probably already know, giving someone more drugs in hopes to calm a drug freakout doesn't always work out so hot...