Final answer:
The nurse would expect to administer opioid analgesics as pain medication for a client reporting severe pain following a mastectomy.
Step-by-step explanation:
For a client reporting severe pain following a mastectomy, the nurse would expect to administer opioid analgesics as pain medication. Opioid analgesics are strong pain relievers often used for moderate to severe pain. Examples of opioid analgesics include morphine, oxycodone, and codeine.