Question

Which of the following drugs is both $\alpha$ and $\beta$ blocker?

• A. Phentolamine
• B. Phenoxybenzamine
• C. Labetalol
• D. Indoramin

Hint:

Labetalol is often used to treat hypertension and works by blocking both $\alpha$ and $\beta$ receptors, which helps to lower blood pressure.

Answer 1

The Correct Option is C

Step 1: Understanding $\alpha$ and $\beta$ blockers.
$\alpha$ and $\beta$ blockers are medications that inhibit the action of adrenergic receptors, $\alpha$ and $\beta$ receptors, respectively, which play a crucial role in regulating heart rate and blood pressure.
Step 2: Analyzing the options.

• (A) Phentolamine: Incorrect. Phentolamine is a non-selective $\alpha$-adrenergic blocker, but it does not block $\beta$ receptors.
• (B) Phenoxybenzamine: Incorrect. Phenoxybenzamine is also a non-selective $\alpha$-adrenergic blocker and does not block $\beta$ receptors.
• (C) Labetalol: Correct. Labetalol is both an $\alpha$- and $\beta$-adrenergic blocker, used to manage high blood pressure.
• (D) Indoramin: Incorrect. Indoramin is primarily an $\alpha$-adrenergic blocker and does not block $\beta$ receptors.

Step 3: Conclusion.
Labetalol is the only drug in this list that works as both an $\alpha$ and $\beta$ blocker, making it the correct answer. Final Answer:} Labetalol.