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A. Vitamin K: Vitamin K is used to reverse the effects of warfarin by promoting clotting factor synthesis. It is ineffective against dabigatran, a direct thrombin inhibitor, because dabigatran’s mechanism is independent of vitamin K–dependent clotting factors.

B. Activated charcoal: Activated charcoal can reduce the absorption of recently ingested dabigatran if given within a short timeframe after ingestion. However, it is not a specific antidote and is only useful in cases of recent overdose, not for urgent reversal in bleeding emergencies.

C. Idarucizumab: Idarucizumab is a monoclonal antibody fragment that specifically binds to dabigatran, neutralizing its anticoagulant effect. It acts rapidly and is indicated in life-threatening or uncontrolled bleeding or when urgent surgery is required, making it the definitive antidote.

D. Andexanet alfa: Andexanet alfa is an antidote for factor Xa inhibitors such as apixaban and rivaroxaban. It does not reverse dabigatran, which is a direct thrombin inhibitor, and therefore is not appropriate.

A. Clarify the order with the healthcare provider: The order for digoxin 25 mg IV is dangerously high and far exceeds the usual therapeutic dose (typically micrograms, not milligrams). The nurse must verify the order before administration to prevent life-threatening toxicity.

B. Listen to the apical pulse for one minute: While assessing the apical pulse is essential before administering digoxin to check for bradycardia, verifying the unusually high dose takes priority to ensure client safety.

C. Obtain a current blood pressure reading: Monitoring blood pressure is important because digoxin can affect cardiac output, but confirming the safety of the ordered dose comes before vital sign assessment in this scenario.

D. Ensure the client's IV site is patent: Ensuring IV patency is necessary for safe medication administration, but it is secondary to clarifying an unsafe order to prevent immediate harm to the client.