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?

"Take 650 milligrams of aspirin for leg discomfort."

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

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

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