Methods for detecting resistance to sedation caused by antipsychotic drugs including methods for detecting psychotic disorders such as but not limited to schizophrenia or bipolar I disorder featuring administering to a patient a dose of an antipsychotic medication; and subjecting the patient to an evaluation at a time point following administration of the dose of the antipsychotic medication. The evaluation is adapted to determine a level of sedation resulting from the dose of the antipsychotic medication. A resulting level of sedation may be one of the following: completely sedated, significantly sedated, moderately sedated, not significantly sedated and completely alert. If the individual is not completely sedated or significantly sedated, or is completely alert, then the patient may have a likelihood of having a psychotic disorder such as schizophrenia.
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