Correct Answer: D
These three agents are categorized as antitussives (cough suppressants):* Dextromethorphan: a non-opioid OTC antitussive that acts centrally on the cough center.* Codeine: an opioid antitussive used for cough suppression at low doses.* Benzonatate: a peripherally acting antitussive that anesthetizes stretch receptors in the respiratory passages.They are not antihistamines (A), decongestants (B), or bronchodilators (C).
References (Pharmacy Technician documents / Study Guides):* PTCB/ExCPT Pharmacology sections:
Respiratory agents-antitussives (dextromethorphan, codeine, benzonatate) and their mechanisms/uses.* Standard pharm tech drug-class tables listing cough/cold medications and classifications.