Pharmacology Quiz #8: Drug Effect Modification

1. A 55-year-old man with a history of chronic heart failure is being treated with digoxin. His primary care physician also prescribes him a new medication for a recently diagnosed condition. Four weeks later, the patient presents to the emergency department with symptoms of digoxin toxicity. Which of the following newly prescribed medications is most likely responsible for enhancing the toxic effects of digoxin? 

Question 1 of 5

2. A patient is prescribed a new medication for hypertension that acts as a vasodilator. After a week of treatment, the patient reports a significant increase in heart rate. This compensatory response is most directly mediated by which of the following mechanisms? 

Question 2 of 5

3. A 30-year-old woman is treated with a drug that leads to upregulation of its target receptor. Which of the following best describes the phenomenon observed in this patient? 

Question 3 of 5

4. A patient with asthma is prescribed a beta-2 adrenergic agonist inhaler for symptomatic relief. After several months of use, the patient notices that the medication is less effective. Which of the following best explains this observation? 

Question 4 of 5

5. A patient on chronic therapy with a particular medication shows decreased responsiveness to the drug over time, requiring higher doses to achieve the same effect. This phenomenon is best described as which of the following? 

Question 5 of 5


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