An antitussive believed to act by exerting a local anesthetic effect on parts of the respiratory tract is:
a. benzonatate (Tessalon). c. codeine sulfate.
b. diphenhydramine HCl (Benadryl). d. dextromethorphan HBr (Benylin DM).
ANS: A
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A Correct: Tessalon acts by exerting a local anesthetic effect on the respiratory tract.
B Incorrect: This does not have a local anesthetic action.
C Incorrect: This does not have a local anesthetic action.
D Incorrect: This does not have a local anesthetic action.
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