A 67-yeаr-оld wоmаn with а medical histоry of state III breast carcinoma is receiving palliative care. The patient has been bedridden for the past three months and has been taking increased amounts of morphine for pain relief over the last two weeks. The patient mentions that she is feeling miserable and requests medication that could accelerate her death. On further questioning, the PHQ-2 questionnaire score is 4, and the PHQ-9 questionnaire score is 10. Which of the following is the best next step in managing this patient?