Inclusion criteria:
Patients diagnosed with schizophrenia based on DSM-5 criteria
Schizophrenic patients who have been treated with risperidone or olanzapine.
Exclusion criteria:
Taking typical antipsychotic and atypical antipsychotic drugs, except for risperidone and olanzapine, and antidepressants, sodium valproate, lithium, and benzodiazepines.
The presence of accompanying psychiatric disorders such as schizoaffective or other psychotic disorders, bipolar disorder, anxiety disorders such as panic disorder or obsessive-compulsive disorder, post-traumatic stress disorder, eating disorder
Dependence or abuse of substances, drugs or alcohol, acutely or in the past 12 months, except for nicotine
Allergy to Modafinil or any of the placebo ingredients