Question 42

Fluoxetine should not be substituted for Paxil due to their differing classifications and uses.

Substituting fluoxetine for Paxil would lead to an incorrect medication error, as these two medications belong to different classes of antidepressants and have distinct mechanisms of action.

A) atomoxetine for Strattera

This substitution is incorrect because atomoxetine is actually the generic name for Strattera, meaning they are the same medication. Therefore, this would not constitute a medication error.

B) duloxetine for Cymbalta

Duloxetine is the generic name for Cymbalta, and substituting one for the other would not result in an error. Thus, this option does not represent a medication error.

C) memantine for Namenda

Memantine is the generic name for Namenda, and therefore substituting them would not lead to an incorrect medication error. This option is also not relevant to the question.

D) fluoxetine for Paxil

Fluoxetine, known as Prozac, and Paxil both serve as antidepressants but belong to different classes (SSRIs vs. SNRIs). Substituting fluoxetine for Paxil could lead to ineffective treatment or adverse effects, making this substitution an incorrect medication error.

Conclusion

Fluoxetine and Paxil have different pharmacological profiles and therapeutic indications, which makes substituting one for the other a significant error. The other options represent either identical medications or their generics, which do not pose a risk of medication error. Thus, option D is the only correct answer regarding an incorrect medication substitution.