hi. i...don't want to call your psychiatrist a 'liar,' but...if the IQ dropped to 86, I think there's something besides Schizophrenia going on there. Maybe...

if they were refusing meds, ended up hospitalized and drugged to the gills, perhaps some shock treatments, then they were released and went off the meds again (vicious cycle)...

I could see that pattern resulting in loss of IQ, especially with the doses of the old drugs that were once popular in hospital settings (1500mgs/Thorazine was not unheard of...).