A Client Taking Amitriptyline (Elavil)for Two Weeks Tells the Nurse

A client taking amitriptyline (Elavil) for two weeks tells the nurse that the medication isn't working" because feelings of depression continue.Which response by the nurse is the most appropriate?

A) This might not be the best medicine for you; I'll call your doctor."
B) You might still feel depressed,but you are looking much better."
C) It is working,but it can take several months to have an effect."
D) It is working,but it can take several weeks to have an effect."