DEA DEA Pharmacology and Drug Effects 1 — Questions and Answers
Question 1: What is the primary mechanism of action of opioids at the cellular level?
- They block dopamine reuptake in the synapse
- They bind to mu, kappa, and delta opioid receptors (Correct answer)
- They enhance serotonin release throughout the CNS
- They inhibit acetylcholinesterase activity
Correct answer: They bind to mu, kappa, and delta opioid receptors
Opioids primarily bind to mu, kappa, and delta opioid receptors in the central nervous system, reducing pain signal transmission.
Question 2: Which neurotransmitter is primarily responsible for cocaine's intense euphoric effects?
- Serotonin
- GABA
- Dopamine (Correct answer)
- Norepinephrine
Correct answer: Dopamine
Cocaine blocks dopamine reuptake in the nucleus accumbens, causing a surge of dopamine that produces intense euphoria.
Question 3: What pharmacological term describes the need for increasing doses of a drug to achieve the same effect over time?
- Physical dependence
- Tolerance (Correct answer)
- Withdrawal syndrome
- Cross-sensitization
Correct answer: Tolerance
Tolerance occurs when the body adapts to a drug's presence, requiring progressively higher doses to achieve the original therapeutic or euphoric effect.
Question 4: Which drug class works primarily by enhancing GABA inhibitory activity at the GABA-A receptor?
- Opioids
- Amphetamines
- Benzodiazepines (Correct answer)
- Hallucinogens
Correct answer: Benzodiazepines
Benzodiazepines bind to GABA-A receptors and enhance the inhibitory effect of GABA, producing sedation, anxiolytic, and anticonvulsant effects.
Question 5: Which synthetic opioid is approximately 100 times more potent than morphine by weight?
- Oxycodone
- Hydromorphone
- Fentanyl (Correct answer)
- Hydrocodone
Correct answer: Fentanyl
Fentanyl is approximately 100 times more potent than morphine, making it extremely dangerous even in microgram quantities and a leading driver of overdose deaths.
Question 6: What term describes the physiological symptoms that occur when a chronically used drug is abruptly discontinued?
- Drug tolerance
- Pharmacological potentiation
- Withdrawal syndrome (Correct answer)
- Receptor sensitization
Correct answer: Withdrawal syndrome
Withdrawal syndrome occurs when physical dependence has developed and the drug is discontinued, producing rebound physiological effects often opposite to the drug's original actions.
Question 7: Which route of drug administration typically produces the fastest onset of pharmacological effects?
- Oral ingestion
- Intravenous injection (Correct answer)
- Intramuscular injection
- Transdermal patch
Correct answer: Intravenous injection
Intravenous injection delivers the drug directly into the bloodstream, bypassing all absorption barriers and producing near-immediate effects within seconds.
DEA DEA Pharmacology and Drug Effects 1
What is the primary mechanism of action of opioids at the cellular level?