Patient description: The patient is a 34-year-old African American man with the known history of Sickle cell disease comes to the clinic with severe bone pain. The patient had severe pain in his lower back that radiated to both thighs scored 9 out of 10. The patient has had positive history of sickle cell crises since childhood. He also had the same symptoms in past two weeks treated with oxycodone which was not beneficial to his pain. His PCP sent him to the emergency department to receive intra venous pain modulators. The patient is afebrile within the normal blood pressure. No splenomegaly was detected in the physical exam. He has no positive history of drug allergy. He won't smoke or uses any illicit drugs. The lab study is as bellow: Hgb: 8 g/dl WBC: 10000 /mm3 Plt: 300000 /ml MCV: 106 fL Hemoglobine electrophoresis: 91% HbS 6%HbF 3%HbA2 AST: 22 U/L ALT: 43 U/L Alk P: 53 U/L Ferritin: 1200 ng/ml

Clinical trial eligibility criteria: eligible ages (years): 18.0-65.0,  Sickle Cell Disease Be male or female, aged 18-65 years old, inclusive Have sickle cell disease (SCD) (hemoglobin SS) without hospitalization for pain crises in the 30 days before screening or for any SCD complications on more than two occasions in the past 12 months; subjects are allowed concomitant usage of hydroxyurea (HU) if the dosage is stable for the 2 months before screening and is at a dosage that does not exceed the product's labeling Have normal laboratory values as defined below Direct bilirubin 0.1 to 1.0 mg/dL Alanine transaminase (serum glutamic pyruvic transaminase) 6 to 41 IU/L Creatinine for females 0.56 to 1.16 mg/dL and for males 0.77 to 1.19 mg/dL If female, be non-pregnant and non-breastfeeding and be surgically sterile or using an acceptable method of contraception throughout the study and for 30 days after study completion Have successfully completed an outpatient screening visit consisting of medical history, physical examination, 12-lead ECG, vital signs, hematology and chemistry tests, urinalysis, urine drug screen, pregnancy test (females), hemoglobin electrophoresis, hepatitis B and C screening, and HIV serology (Note: Subjects with abnormal screening values may be eligible if the results are not clinically significant, as judged by the investigator or medical monitor) Be able to understand and have provided written informed consent including signature on an informed consent form approved by an institutional review board Agree to abide by the study schedule and dietary restrictions and to return for the required assessments  Have evidence of clinically significant cardiovascular, respiratory, renal, hepatic, pulmonary, gastrointestinal, hematological, neurological, psychiatric, or other disease that may interfere with the objectives of the study or the safety of the subject, as judged by the investigator in agreement with the sponsor or medical monitor, or have been hospitalized in the past 6 months as a result of these conditions Have been hospitalized in the 14 days before enrollment, for any reason Be currently on regularly scheduled transfusions Have received a transfusion within 2 weeks of administration of study drug Have taken herbal preparations in the 2 weeks before dosing (Note: subjects are allowed concomitant usage of HU and other scheduled prescription drugs if the dosage is stable for the 2 months before screening and is at a dosage that does not exceed the product's labeling. These scheduled prescription medications will be continued during the study [including during dosing]. All other medications, including over-the-counter medications used according to the product labeling, administered on an as-needed basis will be permitted except for the 24 hour period before dosing and the day of dosing. Medications for pain management will be allowed as needed [including during dosing.]) Have taken any other investigational drug within 30 days or 5 half-lives before the screening visit, whichever is longer Consumed more than 14 alcoholic drinks per week or more than 3 drinks per day at any point in the past month Have received disulfiram or 4-methylpyrazole within 30 days before dosing Have taken any cough-cold product containing dextrorphan or dextromethorphan within 4 days before dosing Have positive result for urine drug test (cocaine, marijuana, opiates, amphetamines, methamphetamines, benzodiazepines, ethanol) at screening visit. However, use of opiates, amphetamines, or benzodiazepines is allowed if prescribed by a physician