What is your approach for managing persistent psychotic symptoms of a hallucinogen-induced persisting psychotic disorder?  

There are two types of HPPD: type 1 (flashbacks only) and type 2, with the complex of visual symptoms elsewhere described. It seems to be due to disinhibition in visual processing in the occipital lobes. Interesting description here: The Mysteries of HPPD, both of which have demonstrable efficacy in...

I have had a couple of patients get manic or psychotic symptoms after mushroom use. Unfortunately, 3 of 4 continue to need medication for it, all in their 20s without previous psychiatric illness.