I don't know much about schizophrenia. I do know that it has much in common (genetically) with epilepsy, autism, ADHD and bipolar disorder.
Listed below are some commonalities I've found in these 4 disorders. I list them by their chromosome band, gene locus (in parentheses/if I have that information) and the name of the condition:
4p15 (EPPS)Epilepsy, partial, w pericentral spikes ?Self
10q24-q26(ADRA2 a2-adrenergic receptor) ADHD
10q26 Bipolar Disorder
10q23.3-q24.1 (EPT) Partial Epilepsy
10q24 (EPT) Partial Epilepsy w. auditory features
10q25.3-q26.1 (EMX2) Epilepsy
12q24.3 Bipolar Disorder
12q24 Predisposed to Autism
12q24 (DAO, DAMOX) Schizophrenia
12q24.2 (ALDH2) Alcohol intolerance
15q11-q13 GABA-A receptor beta3 and alpha5 subunit gene cluster on chromosome
autistic/asperger savant skills
15q13-14 (CHRNA7) schizophrenia
15q13-14 (CHRNA7) juvenile myoclonic epilepsy
16p13.3 (SSTR5) Bipolar Affective Disorder
16p13 (ADHD) Attention deficit-hyperactivity disorder
16p13.3 (TSC2) Tuberous Sclerosis 2* see note below
*TSC2 can include:Epilepsy and Autism,
16p13 (EIM) Epilepsy,myoclonic,infantile
22q11-q12 (FPEVF) Epilepsy, partial, with variable foci
22q11.2 deletion (GRK3) Bipolar; Mixed State & Rapid Cycling
22q11.2 Schizophrenia, susceptibility to
22q11-13 Schizophrenia, susceptibility to
22q13.1 Autism, succinylpurinemic
As for autism, there really is no medicine out there, per se.
If a person with autism or Asperger Syndrome is hyperactive, you might give him/her a stimulant such as Ritalin. If they have mood swings, a mood stabilizer such as Lithium or Tegretol might be in order.
As I understand it, you can treat the symptoms, but you can't treat the autism itself, unless you want to argue the DAN! (Defeat Autism Now) approach, but even that isn't with medication. I discussed this a few posts up when I talked about diet (gluten & casein) and enzymes, omega 3 fatty acids, candida yeasts (although the medication "Diflucan" is sometimes used to help here), metal toxicity and chelation, and vitamin supplements (Bcomplex and C in particular).
The DAN! approach, is however, very controversial. Many consider it "quackery."