Question

Among the following groups, which combination is NOT useful for the treatment of hypertension?

• A. Atenolol with amlodipine
• B. Enalapril with Hydrochlorothiazide
• C. Alpha methyldopa with clonidine
• D. Amlodipine with lisinopril

Hint:

Methyldopa and clonidine share the same central alpha-2 mechanism.

Answer 1

The Correct Option is C

Step 1: Understanding the Question.
We need to spot the drug pair that does not make sense as a combination for treating high blood pressure.

Step 2: Key Concept.
A rational antihypertensive combination pairs drugs from different classes that work through different mechanisms, so their effects add up and side effects from each drug stay smaller. Pairing two drugs from the same class or with the same mechanism gives little added benefit and just piles on side effects.

Step 3: Detailed Explanation.
Atenolol, a beta blocker, paired with amlodipine, a calcium channel blocker, is a standard and rational combination since the two act by different mechanisms. Enalapril, an ACE inhibitor, with hydrochlorothiazide, a thiazide diuretic, is one of the most commonly used and rational pairs in hypertension treatment. Amlodipine with lisinopril combines a calcium channel blocker with an ACE inhibitor, another well accepted and rational pairing. Alpha methyldopa and clonidine, however, are both centrally acting alpha-2 agonists that lower blood pressure through the same brainstem mechanism. Using them together does not add extra blood pressure control, it only adds up their shared side effects such as sedation and dry mouth, and combining two drugs from the same class like this is not considered good practice.

Step 4: Final Answer.
Alpha methyldopa with clonidine is not a useful combination, since both act through the same centrally acting mechanism.