National Certified Addiction Counselor, Level 2 (NCAC II) Practice Exam Exam

Oxycodone is the correct choice because it is classified as an opioid analgesic, which primarily acts on the central nervous system to relieve pain. Unlike central nervous system stimulants, which increase alertness, attention, and energy by enhancing the activity of neurotransmitters like norepinephrine and dopamine, oxycodone does not function in this manner.

Cocaine, amphetamines, and caffeine are all known for their stimulant properties. Cocaine and amphetamines directly increase dopamine levels, leading to heightened energy and alertness. Similarly, caffeine acts as a stimulant by blocking adenosine receptors, promoting wakefulness and reducing fatigue. Thus, understanding the pharmacological categories helps to clearly delineate oxycodone's function as a sedative analgesic rather than a stimulant.