LYCOS RETRIEVER 
Psychosis: Delusions
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It is ... believed that some drugs such as amphetamines and cocaine can cause a condition known as a drug-induced psychosis. This psychosis can last up to a few days, and is often characterized by hallucinations, delusions, memory loss and confusion. This usually results from prolonged or heavy street-drug use; and it responds well to treatment.
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Patients suffering from psychosis are unable to distinguish the real from the unreal. They experience hallucinations and/or delusions that they believe are real, and they typically behave in an inappropriate and confused manner.
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Post-partum psychosis is very rare. It is not so much a variety of post-partum depression as it is an entity onto itself. It is characterized by homicidal and suicidal impulses, hallucinations, delusions, disorganized and bizarre thinking.
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Delusions