What is essential for a nurse to inform a patient when prescribing a new anticoagulant?

The correct choice highlights the importance of informing a patient about the potential side effects of their medication, specifically the risk of excessive bruising associated with anticoagulants. Anticoagulants, by their nature, reduce blood clotting and can increase the risk of bleeding, which can manifest as easy bruising for some patients. Educating patients about this possibility helps them recognize and properly respond to signs of bleeding or other complications, leading to safer use of the medication.

While it is important to mention other aspects like monitoring INR levels or dietary restrictions, the direct concern of excessive bruising is a significant and immediate safety issue that patients must be aware of when starting an anticoagulant. This understanding equips them to take precautions and communicate effectively with their healthcare providers about any unusual symptoms they experience.