Dual-Diagnosis patients: Schizophrenia and Substance abuse

Key points
- Patients with schizophrenia who abuse drugs or alcohol are called dual-diagnosis patients.
- Research suggests that schizophrenia patients are at an increased risk of having a substance-abuse problem.
- Approximately 47 percent of patients with schizophrenia have a diagnosis of substance abuse.
- As a result, dual-diagnosis patients end up costing society a great deal.
Patients with schizophrenia who abuse drugs or alcohol are called dual-diagnosis patients. A dual-diagnosis patient has two diagnoses; in this case, schizophrenia and substance abuse.
Research suggests that schizophrenia patients are at an increased risk of having a substance-abuse problem. In fact, someone with schizophrenia is more than four times more likely to have a substance-abuse problem than someone without schizophrenia.
Approximately 47 percent of patients with schizophrenia have a diagnosis of substance abuse. That's nearly one-half of all patients with schizophrenia. Substance use is a particularly serious problem for patients with schizophrenia because drug use by schizophrenia patients increases the chance that a patient will become violent or get into trouble with the law. Schizophrenic substance abusers are less likely to benefit from traditional treatment. They are more likely to refuse to take their medication, are less likely to respond to psychological treatments, and have poorer overall functioning and an increased chance of relapse.
As a result, dual-diagnosis patients end up costing society a great deal. They require more financial resources in terms of legal intervention and repeated psychological treatment. The unique economic burden of dual-diagnosis patients has driven researchers to figure out how best to treat these complicated problems.
Why would schizophrenia patients be more likely to abuse drugs or alcohol? To begin, many schizophrenia patients use drugs because they believe that they might help relieve their symptoms. Some patients use drugs or alcohol instead of taking prescription medication, a process called self-medicating.
Unfortunately, some drugs, such as cocaine or methamphetamine, can actually make schizophrenia symptoms worse.
Patients who are taking their medication and still use drugs may find that the drugs interfere with the good effects of their medication.
One's living or social environment, specifically one in which there is increased access to drugs, can make it more likely that schizophrenic patients become drug abusers. Downward drift suggests that patients with schizophrenia may live in poorer neighborhoods as a function of their mental illness. Drugs may be more accessible in impoverished neighborhoods.
Finally, the symptoms of schizophrenia, specifically poor interpersonal skills, might lead some patients to associate with people who use drugs. In an attempt to find a community, someone with schizophrenia might find it easier to be accepted by people whose lives revolve around drug use. In this situation, someone with schizophrenia might start using drugs in order to fit in. Living with schizophrenia as part of one's identity is a challenge and one that is difficult for society to accept. Perhaps some patients with schizophrenia find it easier to live as a drug addict rather than as someone with mental illness. All in all, schizophrenia patients who abuse drugs and alcohol can be problematic for treatment professionals.
Written and revised by
Gerald Hurowitz, M.D.
Our doctors write and review articles for accuracy and keep them up to date.
health.am provides general information, not medical advice. Always consult a qualified health professional about your own health.
Explore health topics
More in this topic
Mental Health →
GuideSchizophrenia Differential Diagnosis
Psychotic symptoms in children and adolescents are diagnostically non-specific, occurring in a wide range of functional psychiatric, neurodevelopmental and organic brain disorders. The differential diagnosis of…
7 May 2009
GuideDual Diagnosis - Addictions
People with addictions often have other psychiatric problems. This was documented in a 1970s survey known as the Epidemiological Catchment Area (ECA) study, in which households were polled in several geographical areas.…
23 October 2008
NewsCancer risk varies in patients with schizophrenia
Compared with the general population, patients with schizophrenia appear to have an elevated risk of colon cancer and a lower risk of respiratory cancer, according to a report in the Archives of General Psychiatry.…
22 December 2007





