Which of the following is an opioid-like agonist?
  1. Phenobarbital
  2. Propoxyphene
  3. Diltiazem
  4. Pemoline
Explanation
Answer - B - Propoxyphene is the only opioid-like agonist listed. Phenobarbital is a barbiturate and a sedative/hypnotic. Diltiazem is a calcium channel blocker. Pemoline is a CNS stimulant.
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