The practical nurse (PN) is administering an analgesic to a client with low back pain. To promote the effectiveness of the medication, which is the best intervention for the PN to implement?

Assist the client to perform active range of motion and back exercises.

Force fluids and progress diet to include milk products.

Reposition the client with proper alignment and massage the lower back.

Encourage the client to take deep breaths and to ambulate frequently.