Which calcium channel blocker is listed in the patient's medication regimen?

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The medication listed is Verapamil in sustained-release form. The SR suffix signals a sustained-release preparation, meaning the exact formulation the patient takes is Verapamil SR. This detail matters because the regimen specifies that specific formulation, which distinguishes it from the other calcium channel blockers listed (Diltiazem, Nifedipine, Amlodipine). Verapamil (especially in SR form) is commonly used when a steady, once-daily level is desired, and it has notable effects on cardiac conduction, particularly the AV node, setting it apart from the dihydropyridines like nifedipine and amlodipine, whose primary action is vascular dilation.