When monitoring a patient on heparin therapy, what laboratory test is used to assess the effectiveness of the medication?

A. Prothrombin time (PT) is used to monitor warfarin therapy, not heparin therapy.

B. Activated partial thromboplastin time (aPTT) is the primary laboratory test used to assess the effectiveness of heparin therapy, measuring the time it takes for blood to clot and ensuring therapeutic levels.

C. The International normalized ratio (INR) is also related to warfarin therapy rather than heparin.

D. Serum potassium level is not relevant for assessing heparin therapy but may be monitored for other reasons.

A. While MAOIs may have some regulatory considerations, they are not classified under a scheduled drug classification like controlled substances.

B. MAOIs are effective in treating depression and anxiety disorders, which is not the reason for their limited use.

C. Although MAOIs can have some side effects, they are more notably associated with dietary and drug interactions rather than causing GI bleeding or esophageal varices.

D. MAOIs can cause dangerous interactions with foods that contain tyramine (like aged cheeses and fermented products) and certain medications, leading to hypertensive crises, making their use cautious and limiting in clinical practice.