I personally found this racetam extremely effective for positive symptions induced by amphetamine; it even completely reversed semi psychosis multiple tymes.
I compiled all study's behind its MAO on my blog; shizophrenia is mainly caused by glutamate hypoactivity and indeed its mostly glutaminergic in action.
http://noveltreatmen...-potential.html
I was predromal shizophrenic (i say was as it appears i completely reversed this state even much better i went much improved to how ive been my whole life but ill make a separate thread about this later) however it should also work against paranoia or semi psychosis for normal individuals i beleive.