A Phase 1 Study To Estimate The Relative Bioavailability Of Co-Administered Formulations Of Azithromycin Microsphere And Chloroquine Test Formulation Compared With Co-Administered Immediate Release Individual Azithromycin And Chloroquine Tablets In Healthy Adult Subjects

• Drug: azithromycin (AZ) microsphere
  
  AZ microsphere (2000 mg) single dose on Day 1.
  Other Name: Zmax
• Drug: test chloroquine (CQ) formulation
  
  Test CQ formulation, 620 mg CQ base, single dose on Day 1.
• Drug: azithromycin (AZ)
  
  AZ IR 4 x 500 mg tablets, single dose on Day 1.
  Other Name: Zithromax
• Drug: chloroquine (CQ)
  
  CQ 2 x 500 mg (600 mg CQ base) tablets, single dose on Day 1
  Other Name: Aralen

• Experimental: Group 1
  
  Co-administer the test chloroquine (CQ) formulation (620 mg CQ base) plus microsphere azithromycin (AZ) (2000 mg) on Day 1.
  Interventions:
  

  • Drug: azithromycin (AZ) microsphere
  • Drug: test chloroquine (CQ) formulation
• Active Comparator: Group 2
  
  Co-administer the individual tablets of CQ 2 x 500 mg (600 mg CQ base) tablets plus AZ IR 4 x 500 mg tablets on Day 1.
  Interventions:
  

  • Drug: azithromycin (AZ)
  • Drug: chloroquine (CQ)

Inclusion Criteria:

• Healthy male and/or female subjects between the ages of 18 and 55 years, inclusive (Healthy is defined as no clinically relevant abnormalities identified by a detailed medical history, full physical examination, including blood pressure and pulse rate measurement, 12 lead ECG and clinical laboratory tests).
• Body Mass Index (BMI) of 17.5 to 30.5 kg/m2; and a total body weight >50 kg (110 lbs).
• An informed consent document signed and dated by the subject or a legally acceptable representative.
• Subjects who are willing and able to comply with scheduled visits, treatment plan, laboratory tests, and other study procedures.

Exclusion Criteria:

• Evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurologic, or allergic disease (including drug allergies, but excluding untreated, asymptomatic, seasonal allergies at time of dosing).
• History of febrile illness within 5 days prior to first dose.
• Treatment with azithromycin within the past 30 days or with chloroquine within the past 45 days.
• Known immediate family history of prolonged QT Syndrome, serious ventricular arrhythmia, or sudden cardiac death. "Immediate" is considered "first degree".
• Known allergy to macrolide antibiotics (eg, erythromycin, clarithromycin, azithromycin) or chloroquine (or other 4 aminoquinolines) or severe allergic reaction to any drug in the past (eg, difficulty breathing, anaphylaxis).
• History of intolerance to azithromycin or chloroquine.