Professionals', patients' and families' views on the use of opioids for chronic breathlessness: A systematic review using the framework method and pillar process.

Background: In combination with non-pharmacological interventions, opioids may safely reduce chronic breathlessness in patients with severe illness. However, implementation in clinical practice varies.

Aim: To synthesise the published literature regarding health professionals', patients' and families' views on the use of opioids for chronic breathlessness, identifying issues which influence implementation in clinical practice.