Which of the following is true of the use of psychomotor stimulants in the treatment of narcolepsy and hyperactivity?
A. Psychomotor stimulants decrease the activity of the sympathetic nervous system.
B. Toxic doses of psychomotor stimulants may cause cardiac arrhythmias and nephritis.
C. Amphetamines have the disadvantage of producing drug tolerance and dependence.
D. All of the above are correct.
Answer: C
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