Cannabis Use and Psychosis in People with Schizophrenia

Cannabis, also known as marijuana, is a psychoactive drug from the Cannabis plant that is used for recreational or medical purposes. Cannabis is smoked or eaten. The predominant psychoactive substance in cannabis is tetrahydrocannabinol (THC). Cannabis THC use is very common in people with schizophrenia. When people with schizophrenia use cannabis THC, this makes their psychotic symptoms and cognition substantially worse. It is important to note that there is another substance in cannabis, cannabidiol (CBD), that does not cause psychotic symptoms. Cannabidiol is found in very low levels in most purchased cannabis, but can be obtained as a concentrate or by prescription. Research has found that cannabidiol can reduce psychotic symptoms in patients with schizophrenia when used to augment antipsychotic medication.

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