A nurse is reinforcing teaching with a client who is postpartum and receiving warfarin for deep- vein thrombosis. Which of the following instructions should the nurse include?

"Use a disposable razor for shaving while taking this medication."

"You should not take oral contraceptives while taking this medication."

"Take 650 milligrams of aspirin for leg discomfort."

"You will be able to stop taking this medication in 2 weeks."