textbook cocaine/amphetamine psychosis. grandiosity, formication, blah blah.

kick the coke out of the d2 receptors with a bunch of seroquel or some typical/atypical antipsychotic, doesn't matter that much and it's sleeping a lot, some anhedonia. the humane thing to do would be to give the dude some low dose of methyphenidate or dextroamphetamine in the short term then assuming he's going to be a bit depressed for a while, put him on say, wellbutrin and cymbalta/effexor because something like prozac is just going to address serotonin and it was dopamine sheen was really fucking with. i think both drugs start acting quickly and should get the three major neurotransmitters moving again.

it's awesome that he's gotten away with this run for as long as he has, but eventually he's going to flip out and think bugs are all over him or do something that's a pure psychotic episode that he'll end up in a locked ward for a few days. then get out and repeat as long as he didn't kill someone.