Final answer:
The nurse should develop outcome criteria related to mood improvement.
Step-by-step explanation:
The nurse should develop outcome criteria related to mood improvement. When caring for a patient taking a selective serotonin reuptake inhibitor (SSRI), the primary goal is to improve the patient's mood. SSRIs work by blocking the reuptake of serotonin, a neurotransmitter that is associated with positive mood and feelings of happiness.