Not to scare you or discourage anyone taking drugs until such time you might reverse this, but be aware that anti-psychotic drugs can cause brain shrinkage.
The only things I could find that might help reverse or slow some of this is exercise and organic ginkgo tincture with cayenne as when they studied the effect of ginkgo on senility it helped about 43% but when cayenne was added went up into like 92% as cayenne is a catalyst herb making any herb taken with it more effective as it gets it to where it needs to go.
Also if I forgot to link the other thread I started on schizophrenia, here it is