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

This question wants the antihypertensive pair that is not rational because the two drugs work in a way that overlaps rather than complements each other.

1. Atenolol with amlodipine: A beta blocker paired with a calcium channel blocker, two different mechanisms, so this combination is rational and commonly used.
2. Enalapril with hydrochlorothiazide: An ACE inhibitor with a thiazide diuretic, a very standard and effective rational pair.
3. Alpha methyldopa with clonidine: Both drugs are centrally acting alpha-2 agonists, meaning they work through the same brainstem pathway. Stacking them adds side effects like drowsiness without adding real blood pressure benefit, so this pairing is not useful.
4. Amlodipine with lisinopril: A calcium channel blocker with an ACE inhibitor, again two different mechanisms working well together.

Three of the four pairs combine drugs from different classes and mechanisms, which is exactly what makes a combination rational. Methyldopa and clonidine break this rule because they share the same central mechanism.

Let's summarize:

• Good antihypertensive combinations mix different drug classes, such as a beta blocker with a calcium channel blocker, or an ACE inhibitor with a diuretic.
• Methyldopa and clonidine both act centrally through alpha-2 receptors, so combining them just adds side effects, not benefit.

So methyldopa with clonidine is the combination that is not useful for hypertension.