Which of the following is a potential risk for patients taking anticoagulants?

Patients taking anticoagulants are at a heightened risk for excessive bruising. Anticoagulants work by inhibiting or blocking the coagulation pathways of blood, which prevents clot formation. This mechanism can lead to increased bleeding tendencies because even minor trauma can result in significant bleeding or bruising. The skin's blood vessels can become more prone to leaking blood, contributing to the appearance of bruises.

While dehydration is a concern for many patients, it is not directly related to the effects of anticoagulants. Improved oxygen levels and increased energy levels are not typical outcomes associated with anticoagulant therapy; instead, patients might experience fatigue or other symptoms related to their underlying conditions or side effects of medication. Therefore, excessive bruising is a relevant and specific risk linked to anticoagulant use that should be monitored closely in patients receiving these medications.