Answer to Question 1
ANS: 3
Laxatives often influence the efficacy of other medications by altering the transit time (i.e., the time the medication remains in the GI tract and is available for absorption). The remaining op-tions would have little bearing on the effectiveness of the hypothyroid medication unless the medication has not been taken long enough to reach therapeutic levels.
Answer to Question 2
ANS: 1
Ingestion of iron, commonly prescribed for certain types of anemia, causes discoloration of the stool (black), nausea, vomiting, constipation (diarrhea is less commonly reported), and abdominal cramps. The remaining options, although focusing on aspects of function that could result in con-stipation, are not focused on the most likely cause in this scenario.