Nalbuphine as a Potential Alternative to Morphine in Sickle Cell Disease Patients with Vaso-occlusive Crisis: A Retrospective Cohort Study.

Background: The use of morphine in managing vaso-occlusive crisis (VOC) in patients with sickle cell disease (SCD) can result in significant side effects. Nalbuphine, a mixed agonist-antagonist opioid, may offer an alternative with fewer complications. Objective: To compare the efficacy and safety of nalbuphine and morphine in pain management among adult SCD patients presenting with VOC. Methods: This retrospective study included adult patients with SCD treated at King Fahad Hospital, Hofuf, Saudi Arabia, between 2019 and 2023. Patients were classified into two groups (receiving morphine and nalbuphine). Pain levels were assessed using the Visual Analog Scale (VAS) at baseline, 1-h, 6-h, and 24-h post-administration. Additional outcomes included the need for rescue medication and discharge rates from the emergency department. Results: A total of 234 patients were included (morphine: 120; nalbuphine: 114). The mean age of the cohort was 30.5 ± 8.7 years, and 63.8% were female. Baseline laboratory data indicated mean hemoglobin of 8.5 g/dL and elevated lactate dehydrogenase (576.9 U/L). At 6 h, 10% and 20% of patients on morphine and nalbuphine, respectively, reported no pain ( Conclusion: Nalbuphine can be a potential alternative for vaso-occlusive crisis pain management in sickle cell disease patients, as it demonstrated superior efficacy compared with morphine, especially at later time points, with reduced need for rescue medication and earlier discharge.