 Quality of life of adult patients with sickle cell disease is deeply impaired by severe adverse medical events that inadvertently occur throughout their time life. Indeed, patients not presenting a life threatening condition often present to the emergency department with sickle cell disease crisis related pain. Currently, the effectiveness of specific analgesic strategies for treating sickle cell disease crisis related pain are mostly based on acetaminophen and opioid derivates combination along with oxygen delivery. Those strategies are effective but may last up to half an hour to obtain pain relief. This delay mostly depends on the availability of venous access and on individual patient response to treatment. Nitrous oxide is a volatile efficient analgesic therapy that has been repeatedly shown to allow rapid analgesia in the emergency department setting. 