A nurse is teaching a client who has a prescription for warfarin. Which of the following statements by the client indicates an understanding of the teaching?

A. "I should not eat cantaloupe while taking the medication.": There is no significant interaction between warfarin and cantaloupe. The primary concern with warfarin and food intake is the vitamin K content, which is found in foods like leafy green vegetables, not cantaloupe. B. "I should use a hard bristle toothbrush.": Using a hard bristle toothbrush is not recommended while taking warfarin, as it increases the risk of gum bleeding due to the anticoagulant effect of the medication. A soft-bristled toothbrush is preferred to reduce bleeding risk. C. "I should not take a St. John's wort supplement.": St. John's wort is known to interact with warfarin by affecting its metabolism and reducing its anticoagulant effect. This can increase the risk of clotting, so avoiding St. John's wort is an important safety measure. D. "I should get my INR checked once a year.": Clients on warfarin need to have their INR checked regularly, typically every 4-6 weeks, depending on the stability of their anticoagulation therapy, not just once a year. Regular monitoring helps ensure the medication is working effectively and safely.