A PMHNP in an outpatient psychiatric clinic receives a new patient who was discharged from an inpatient psychiatric unit three days ago. The patient brings a discharge summary listing olanzapine 20 mg nightly and valproic acid 1000 mg daily. However, the patient reports that a different provider in the emergency department changed his valproic acid to lithium 900 mg daily before the inpatient admission, and his PCP had previously discontinued olanzapine due to metabolic syndrome. The patient is confused about which medications he should actually be taking. Which of the following best describes the PMHNP's professional responsibility?