Question 1

How do you remember Clonidine?

Accepted Answer

Clonidine breaks down as CLONI = calm it + DINE = down. Break clonidine into CLONI (sounds like calm it) and DINE (sounds like down): calm it down. When you want to calm the body down, you turn on the alpha-2 receptor, the one that puts the brakes on sympathetic outflow. Clonidine is an alpha-2 agonist, so it switches that brake on: less sympathetic signal leaving the brain, so heart rate and blood pressure drop. Calm-it-down, alpha-2 on, sympathetics off.

Question 2

What class of drug is Clonidine?

Accepted Answer

Clonidine is a Alpha-2 Agonist • Antihypertensive.

Question 3

How is Clonidine tested on the USMLE?

Accepted Answer

Clonidine is a central alpha-2 agonist. Activating alpha-2 receptors in the brainstem reduces sympathetic outflow, which lowers heart rate and blood pressure. Alpha-2 is a presynaptic brake, so an agonist here calms the sympathetic system instead of stimulating it.

Question 4

A patient on clonidine is also started on propranolol. Days later, around a missed clonidine dose, his blood pressure spikes dangerously. Which mechanism best explains why combining these worsens hypertension?

Accepted Answer

A - Clonidine withdrawal triggers a catecholamine surge. With propranolol blocking beta-2 vasodilation, those catecholamines hit alpha-1 receptors unopposed and vessels constrict. B is wrong because propranolol doesn't block alpha-2, C is self-contradictory since beta-1 blockade lowers rate, and D is not a clearance mechanism.

Clonidine

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