Which condition is a contraindication to the use of a calcium channel blocker?

• A. Hypokalemia
• B. Dysrhythmias
• C. Hypotension
• D. Increased intracranial pressure

Answer: (C)

Calcium channel blockers lower blood pressure by relaxing arterial smooth muscle and, for non-dihydropyridines, by slowing conduction and reducing heart rate and contractility. If blood pressure is already low, giving a CCB can push it even further down, risking inadequate tissue perfusion and shock. That makes hypotension a clear contraindication.

The other conditions listed don’t inherently prevent CCB use. Low potassium isn’t a direct contraindication, though electrolyte issues can complicate management. Some calcium channel blockers are used to treat certain rhythm problems by slowing AV conduction, so dysrhythmias aren’t an absolute barrier. Increased intracranial pressure isn’t a standard contraindication for CCBs.