What is the mechanism of action of codeine in treating coughs?
A) Works on CNS to suppress cough centers in the medulla oblongata.
B) Elevates the threshold for cough in the medulla oblongata.
C) Thins mucus and lubricates the irritated respiratory tract.
D) Acts as vasoconstrictor and shrinks dilated blood vessels.
B
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A pharmacist is asked to prepare 100 mL of a 1:5000 aqueous solution of benzalkonium chloride. What percent is the concentration that is being asked for?
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Examples of the approach, via natural or artificial opening endoscopic, are listed except for:
A. tongue depressor. B. direct laryngoscopy. C. using an otoscope. D. indirect laryngoscopy.
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