A patient is prescribed a patient-controlled analgesia (PCA) delivery system for pain secondary to renal cancer. Which instruction would be correct for the nurse to include when educating the patient about the PCA system?
1. Pressing the button repeatedly may lead to overdose.
2. Administer a dose only when the pain becomes severe.
3. It uses an infusion system controlled by the patient.
4. It is programmed to administer as many doses as the patient needs