Final answer:
The nurse should advise the patient not to take loperamide (Immodium) if they have bloody diarrhea, as it could indicate a more serious condition. Consultation with a healthcare provider is necessary before starting any medication.
Step-by-step explanation:
The nurse should tell the patient not to take the drug if they have bloody diarrhea. This is because loperamide (Immodium) is not recommended for use in patients who have bloody diarrhea, as it may indicate a more serious underlying condition that requires medical attention. It is important for the patient to consult with a healthcare provider before starting any medication.