LCAS Pharmacology of Addictive Substances 1

Question 1

Which neurotransmitter is most centrally involved in the mesolimbic reward pathway associated with substance use disorders?

Accepted Answer

Dopamine

Answer

Dopamine is the primary neurotransmitter in the mesolimbic reward pathway, and surges in dopamine release are the central mechanism underlying the reinforcing effects of addictive substances.

Question 2

Which of the following correctly describes the primary mechanism of action of opioids in the central nervous system?

Accepted Answer

They bind to mu, kappa, and delta opioid receptors

Answer

Opioids exert their analgesic and euphoric effects primarily by binding to mu-opioid receptors (as well as kappa and delta receptors) distributed throughout the brain and peripheral nervous system.

Question 3

Alcohol produces CNS depression primarily by which pharmacological mechanism?

Accepted Answer

Enhancing GABA-A inhibitory activity and inhibiting NMDA glutamate receptors

Answer

Alcohol enhances inhibitory GABA neurotransmission and inhibits excitatory glutamate activity at NMDA receptors, producing the characteristic CNS depressant effects.

Question 4

In addiction pharmacology, 'tolerance' is best defined as:

Accepted Answer

The requirement for increasing doses to achieve the same effect previously produced by a lower dose

Answer

Tolerance develops when repeated substance exposure leads to diminished pharmacological effects, requiring progressively higher doses to achieve the original response.

Question 5

Which opioid's long half-life (24–36 hours) produces withdrawal symptoms that are less intense but more prolonged compared to short-acting opioids?

Accepted Answer

Methadone

Answer

Methadone's long half-life means blood levels decline slowly, producing a withdrawal syndrome that is milder in peak intensity but extends over a longer period than short-acting opioids.

LCAS - Licensed Clinical Addiction Specialist Practice Test

LCAS - Licensed Clinical Addiction Specialist Practice Test

LCAS Pharmacology of Addictive Substances 1