Daily Vitamin D for Sickle-cell Respiratory Complications

About the study

This study aims to answer the question whether daily oral vitamin D supplementation can reduce the risk of respiratory or lung complications in children and adolescents with sickle cell disease. Respiratory problems are the leading causes of sickness and of death in sickle cell disease. The investigators hypothesize that daily oral vitamin D3, compared to monthly oral vitamin D, will rapidly increase circulating vitamin D3, and reduce the rate of respiratory complications by 50% or more within the first year of supplementation in children and adolescents with sickle cell disease.

This study is funded by the FDA Office of Orphan Products Development (OOPD).

Study point of contact

Gary M Brittenham, MD
212 305 7005
[email protected]
Margaret T Lee, MD
212 305 6290
[email protected]


1 United States site


3 Years - 20 Years


Hb SS, Hb SC


Phase 2

Study type






participation requirements

Diagnosis of sickle cell disease (Hb SS, Hb SC, Hb S-Beta-thalassemia)
Age 3-20 years old

participation restrictions

Patient unwilling or unable to provide written informed consent (and assent, if applicable)
Patient unable or unwilling to comply with requirements of the clinical trial
Participation in another clinical trial
Current diagnosis of rickets
History of hypercalcemia or diagnosis of any medical condition associated with hypercalcemia, including primary hyperparathyroidism, malignancy, sarcoidosis, tuberculosis, granulomatous disease, familial hypocalciuric hypercalcemia
Current use of corticosteroids, excluding inhaled steroids
Current use of anticonvulsants (phenytoin, phenobarbital, carbamazepine)
Therapy with thiazide diuretics or lithium carbonate
Known liver or renal disease
Patients taking medications for pulmonary complications of sickle cell disease not on a stable dose of medications, as defined by a change in medications or doses within the three months prior to study entry
Patients on chronic red blood cell transfusion therapy


  • New York, New York, United States, Columbia University Medical Center
Last updated 2022-06-21