There's also multiple drug approaches to dealing with things. I'm currently diagnosed Bipolar I, but other former "professionals" swear up and down its "really" Schizophrenia. So...

...I take 30mgs/Abilify daily. I also take 2 anti-epileptic drugs (normal dose Trileptal, low dose lamictal) for mood and agitation. I was still having problems, so my doctor added Wellbutrin. The antidepressant cleared up many of my remaining problems. Wellbutrin isn't used as much in "Schizophrenia" as in "Bipolar I" because it tends to be somewhat stimulating.

So, whether I "really" have Schizophrenia or Bipolar I, the addition of a mildly stimulating depression drug helped me with lingering voices and other problems.

Of course, the shrink looks at that and says "Based on how you responded to Wellbutrin, I think you have psychotic depression." Thing is...again, no blood work, no brain scan, and multiple opinions.