Antipsychotic drugs are psychiatric medication primarily used to manage
psychosis (e.g., delusions or hallucinations), particularly in schizophrenia
and bipolar disorder. First and second generations of antipshychotics tend to
block receptors in the brain's dopamine pathways, but antipsychotic drugs
encompass a wide range of receptor targets. The inhibition constant, Ki, at
the level of membrane receptors is a major determinant of their
pharmacokinetic behavior and, consequently, it can affect their antipsychotic
activity. Here, predicted inhibition constants, Ki for 71 antipsychotics,
already approved for clinical treatment, as well as representative new
chemical structures which exhibit antipsychotic activity, were evaluated
using 3D-QSAR-CoMSIA models. Significant values of the cross-validated
correlation q2 (higher than 0.70) and the fitted correlation r2 (higher than
0.80) revealed that these models have reasonable power to predict the
biological affinity of the 15 new risperidone and 12 new olanzapine
derivatives in interactions with dopamine D2 and serotonin 5HT2A receptors;
these compounds are suggested for further studies.