Patterns of current and lifetime substance use in schizophrenia

Area of Science:

• Psychiatry
• Addiction Medicine
• Clinical Psychology

Background:

• Substance use disorders (SUDs) are highly prevalent in individuals diagnosed with schizophrenia.
• Understanding the specific patterns and correlates of SUDs in this population is crucial for effective treatment.
• Previous research, primarily from North America, has established a high comorbidity rate.

Purpose of the Study:

• To assess the prevalence and patterns of substance use, abuse, and dependence in a sample of Australian outpatients with schizophrenia.
• To examine the relationship between SUDs and demographic factors, criminal history, symptom severity, and treatment outcomes.
• To compare findings with existing literature from other regions.

Main Methods:

• A structured interview and standardized rating scales were administered to 194 outpatients with schizophrenia.
• Case manager assessments and urine drug screens were utilized to confirm substance use.
• Data collected included demographics, criminal history, symptom reports, hopefulness, and social support.

Main Results:

• The 6-month and lifetime prevalence of substance abuse or dependence was 26.8% and 59.8%, respectively.
• Alcohol, cannabis, and amphetamines were the most commonly abused substances.
• Individuals with SUDs were younger, single males with more criminal charges, but did not show increased suicide attempts or hospitalizations.

Conclusions:

• The high rate of substance abuse in schizophrenia patients in Australia mirrors North American findings.
• A slightly different pattern of substance abuse was observed, with less cocaine use, potentially due to drug availability.
• Substance use is associated with earlier treatment initiation and higher current symptom burden in this population.