Some people who abuse drugs have symptoms similar to those of schizophrenia. Therefore, people with schizophrenia can be confused with people who are affected by drugs. Most researchers do not believe that substance abuse causes schizophrenia. However, people who have schizophrenia are much more likely to have a problem with alcohol or substance abuse.


Substance abuse may make treatment for schizophrenia less effective. Some drugs, such as amphetamines or cocaine, may make the symptoms worse. Also, people who abuse drugs are less likely to follow their treatment plan.

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