A nurse is providing teaching to a client who has a new prescription for warfarin. Which of the following instructions should the nurse include in the teaching?

A. "Use an electric razor when shaving while taking this medication.": Warfarin increases the risk of bleeding due to its anticoagulant effects. Using an electric razor reduces the risk of cuts and subsequent bleeding, making this an important safety precaution. B. "This medication can cause back pain.": Back pain is not a common or expected side effect of warfarin. While bleeding complications could theoretically cause pain, routine back pain is not an anticipated effect and should be evaluated separately. C. "Avoid taking this medication with milk products.": Warfarin’s absorption is not significantly affected by milk products. The main dietary consideration is consistent intake of vitamin K–rich foods, not dairy. D. "Take the last dose of the day 1 hour before bedtime.": Warfarin timing is flexible and does not need to be taken specifically before bedtime. Consistency in the daily dosing time is important, but the exact hour is not critical.