Durvalumab immunotherapy became a new standard of care for patients with stage III unresectable non-small cell lung cancer whose disease did not progress following two cycles of platinum-based chemoradiotherapy after its approval in February 2018, and in March 2020, its indication was expanded for use as first-line treatment in patients with extensive-stage small cell lung cancer as well. Key to keeping patients on immunotherapy treatment and giving them the best chance at long-term survival is effective management of immune-related adverse events.