Problems develop for psychiatric readers, however, in the book’s first section, which deals with clinical pharmacology of psychoactive substances and epidemiology of substance use disorders. The material is often too basic ("the cells in the brain are called neurons"), the information is sometimes outdated ("six different types of neurotransmitters have been identified") and occasionally incorrect (phencyclidine is classified as a Schedule III, not a Schedule I, drug), chemical names are misidentified (THC is identified as tetrahydracannabis), medical terms are misclassified (pupillary constriction and respiratory depression are listed under acute psychological effects of opioid use), and incorrect physiological statements are made ("alcohol…is sometimes thought of as a stimulant; the increased energy that is observed is due to increased blood sugar").