Therapeutic management of schizophrenia and substance use disorders dual diagnosis – clinical vignettes Octavian Vasiliu1

Patients with schizophrenia are frequently diagnosed with addictive comorbidities, and data in the literature support a 10 to 70% prevalence of this dual diagnosis. Nonetheless, substance use disorders can be missed during the initial interview with a psychotic patient, if the clinician is focused only on the more obvious manifestations. Therefore, using psychometric scales and structured interviews in patients with schizophrenia is strongly encouraged because the case manager will base his/her therapeutic decisions on quantifiable data about these patients’ symptoms and functional status. Clinical management in dual diagnosis cases must address both conditions simultaneously, as the delay in the initiation of substance withdrawal treatment may hinder the recovery from a psychotic episode. An important issue is represented by the potential pharmacologic interactions between drugs administered for schizophrenia and those targeting substance withdrawal and substance dependence. Other important aspects refer to (1) the therapeutic adherence, which can influence the prognosis of both conditions, (2) the negative impact of residual psychotic symptoms and substance-related disorders over the patient quality of life and daily functioning, (3) the necessity to integrate variables like the patient’s specific needs, lifestyle, and psychological resources in the therapeutic decision. These clinical vignettes are focused on clinical, biological, psychometric, and pharmacological dimensions, supporting the formulation of treatment recommendations based on monitoring both psychiatric and biological profiles.