Abstract
As legislation and societal perception surrounding the use of cannabinoids rapidly change, addiction specialists need to be knowledgeable about cannabinoid psychopharmacology, so that they can adequately inform patients, other healthcare providers, and policy decision-makers. This chapter provides a brief review of the effects of plant-based and synthetic cannabinoids, focusing on their time- and dose-dependent effects on mood, anxiety, perception, cognition, and psychomotor functioning. We also discuss risk factors for the progression to cannabis use disorder (CUD), and pharmacological and psychosocial treatments for CUD. Finally, the chapter covers the effects of cannabinoids on individuals with psychiatric disorders, medicinal use of cannabinoids, and potential pharmacokinetic interactions with other psychotropic medications.
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Review Questions
Review Questions
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1.
A 21-year-old man started using cannabis at age 15 and found himself escalating his daily use at age 17 to achieve the same desired effect. He feels “jittery” and “depressed,” and cannot sleep when he stops using cannabis. He was an above-average student in junior high school, but his performance and grades subsequently fell and he often felt unmotivated. Despite wanting to pursue a college education, he missed several application deadlines. He took a job at a local coffee shop, because the short work shifts allowed more time to use cannabis alone at home. Which of the following diagnoses best describes this presentation?
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A.
Cannabis hyperemesis syndrome
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B.
Cannabis withdrawal syndrome
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C.
Chronic cannabis syndrome
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D.
Cannabis use disorder
Answer D.
Explanation: This individual has symptoms of tolerance, withdrawal, difficulty with major role obligations in school and work, which are diagnostic criteria for cannabis use disorder. He does not present with the persistent nausea or vomiting of hyperemesis syndrome, or with the irritability after cannabis cessation of withdrawal. Chronic cannabis syndrome is not a DSM-5 diagnosis.
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A.
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2.
A 20-year-old woman has smoked hashish daily for the past 12 months. She was stopped by the police for driving while intoxicated and held in custody over the weekend until her court hearing on Monday. While unable to use hashish, which of the following sets of symptoms is she most likely to experience?
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A.
Muscle twitches, lacrimation, rhinorrhea, and diarrhea
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B.
Nausea, headache, irritability, vomiting, and insomnia
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C.
Hallucinations, tachycardia, and hypertension
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D.
Slurred speech, vomiting, ataxia, and hypotension
Answer: B.
Explanation: This person is likely to experience cannabis withdrawal syndrome. Muscle twitches, lacrimation, rhinorrhea, and diarrhea tend to occur with opioid withdrawal. Hallucinations, tachycardia, and hypertension are common with severe alcohol withdrawal. Slurred speech, ataxia, vomiting, and hypotension occur during opioid intoxication.
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A.
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3.
A 22-year-old man develops paranoid delusions and dissociative symptoms over seven months, until he is hospitalized for an episode of behavioral dysregulation. He reports smoking five joints of cannabis daily since the age of 13. He is diagnosed with unspecified psychotic disorder and started on an antipsychotic medication. Which of the following best describes the current scientific consensus regarding the relationship between cannabis use and psychotic disorders?
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A.
Schizophrenia is caused by early cannabis use
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B.
Prodromal psychotic symptoms are temporarily relieved by cannabis
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C.
The development of a psychotic disorder is independent of cannabis use
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D.
Though the relationship between psychosis and cannabis use is complex, cannabis does appear to be a risk factor for the development of psychosis
Answer: D.
Explanation: Cannabis use is a risk factor for psychosis; however, it is neither sufficient to cause it, as answer A suggests it, nor necessary. In this clinical scenario, it is likely that prolonged and heavy cannabis use contributed to the onset of the psychotic disorder. There is no evidence to suggest prodromal symptoms of psychosis are relieved by cannabis.
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A.
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De Aquino, J.P., Arnaout, B. (2020). Cannabinoids. In: Marienfeld, C. (eds) Absolute Addiction Psychiatry Review. Springer, Cham. https://doi.org/10.1007/978-3-030-33404-8_10
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DOI: https://doi.org/10.1007/978-3-030-33404-8_10
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