Amisulpride has no effect on plasma clozapine concentrations.

@article{Bergemann2005AmisulprideHN,
  title={Amisulpride has no effect on plasma clozapine concentrations.},
  author={Niels Bergemann and Kai R Kress and Alex Frick and J{\"u}rgen Kopitz},
  journal={Journal of clinical psychopharmacology},
  year={2005},
  volume={25 5},
  pages={
          494-7
        }
}
To the Editors: To date, only a few systematic studies analyzing the use of combinations of antipsychotics have been undertaken. However, knowing how clozapine and amisulpride interact could be particularly important as patients with schizophrenia might well profit from such a combination treatment; indeed, a few case reports and studies support this notion. Good efficacy and tolerability of this combination in treating positive and negative symptoms have been reported even when the disease has… 
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