Final answer:
The nurse should rotate sites and examine previous sites for redness when a patient complains about pain after being administered menotropins by the intramuscular route.
Step-by-step explanation:
The nurse should perform the intervention of rotating sites and examining previous sites for redness when a patient complains about pain after being administered menotropins by the intramuscular route. This intervention is important because it helps to identify any potential injection site reactions or infections. By rotating sites and monitoring for redness, the nurse can ensure that the injections are being given in a safe and effective manner.