Which are therapeutic uses of verapamil? (Select all that apply)

Choice A reason: Verapamil is not used for preterm labor; calcium channel blockers like nifedipine are preferred. Verapamil targets cardiovascular conditions, so this is incorrect for its therapeutic use. Choice B reason: Verapamil is contraindicated in heart block, as it slows conduction. It is used for hypertension and dysrhythmias, not conduction blocks, so this is incorrect. Choice C reason: Verapamil is a channel blocker used for essential hypertension, effectively reducing blood pressure by relaxing vessels. This is a standard use, making it a correct choice. Choice D reason: Hypocalcemia is not treated with verapamil; it may worsen with calcium channel blockers. Cardiovascular indications are primary, so this is incorrect. Choice E reason: Verapamil is used for cardiac dysrhythmias, such as supraventricular tachycardia, by slowing heart rate. This is a recognized indication, making it a correct choice.