A 58-year-old woman who is obese presents to the emergency department with diaphoresis and crushing chest pain that radiates to her left arm. The physician orders an ECG and checks her cardiac enzymes to confirm his suspicion of myocardial infarction. Because of the quick response and intervention, she survives and is ultimately discharged with a prescription for low-dose daily aspirin to inhibit platelet aggregation. Two weeks after discharge, she takes ibuprofen for a tension headache. What is the effect of the ibuprofen on her anticoagulation regimen?

A 58-year-old woman who is obese presents to the emergency department with diaphoresis and crushing chest pain that radiates to her left arm. The physician orders an ECG and checks her cardiac enzymes to confirm his suspicion of myocardial infarction. Because of the quick response and intervention, she survives and is ultimately discharged with a prescription for low-dose daily aspirin to inhibit platelet aggregation. Two weeks after discharge, she takes ibuprofen for a tension headache. What is the effect of the ibuprofen on her anticoagulation regimen?

A 58-year-old man with diabetes has difficulty achieving an erection. He has a history of cardiovascular disease. A friend recommends yohimbine. Which of the following describes yohimbine's likely mechanism of action?

Aspirin:

The following may increase digitalis toxicity EXCEPT: