A patient who takes a monoamine oxidase (MAO) inhibitor asks the nurse about taking over-the-counter medications to treat cold symptoms. Which medication will the nurse counsel the patient to avoid while taking an MAO inhibitor?
a. Diphenhydramine
b. Guaifenesin
c. Pseudoephedrine
d. Saline nasal spray
ANS: C
MAO inhibitors can cause hypertensive crises, which can be fatal when taken with sympathomimetic drugs such as pseudoephedrine.
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