The registered nurse supervises a student nurse who is caring for a client newly prescribed lithium for the treatment of bipolar disorder. Which action by the student indicates a need for further teaching?

1. Advises the client to drink 2-3 liters of water each day
2. Instructs the client to limit intake of cola, tea, coffee, and alcohol
3. Shows the client how to carefully check food labels to follow a low-sodium diet
4. Teaches the client that it may take up to several weeks for the drug to be effective