Conditions: Obesity Tuberculosis
Keywords: Obesity Pharmacokinetics Pharmacodynamics Dose individualization Tuberculosis
Allocation: NA | Intervention model: SINGLE_GROUP
Enrollment: 18
Healthy volunteers: yes

Brief summary:
This study is designed to measure drug concentrations in the blood of healthy volunteers administered a single dose of ethambutol. Our hypothesis is that volunteers with a body mass index (BMI) 25-40 kg/m2 will remove ethambutol more quickly from the blood than leaner volunteers, and those with a BMI \> 40 kg/m2 will have even greater clearance than those who are leaner.

Detailed description:

Arms:
arm 1: All volunteers in each category will receive a single dose of oral ethambutol based on American Thoracic Society/Centers for Disease Control and Prevention/Infectious Diseases Society of American (ATS/CDC/IDSA) TB treatment guidelines.1 We will not use any doses higher than the maximum dose recommended for daily administration by the current ATS/CDC/IDSA TB guidelines (which use ideal body weight for dosing):

40-55kg: 800 mg (two 400 mg tablets) 56-75kg: 1,200 mg (three 400 mg tablets) 76-90kg: 1,600 mg (four 400 mg tablets) \> 90 kg: No dosage recommendations so these volunteers will only receive 1,600 mg (four 400 mg tablets)

Interventions: intervention 1: Ethambutol
Intervention descriptions: intervention 1: All volunteers in each category will receive a single dose of oral ethambutol based on American Thoracic Society/Centers for Disease Control and Prevention/Infectious Diseases Society of American (ATS/CDC/IDSA) TB treatment guidelines.1 We will not use any doses higher than the maximum dose recommended for daily administration by the current ATS/CDC/IDSA TB guidelines (which use ideal body weight for dosing):

40-55kg: 800 mg (two 400 mg tablets) 56-75kg: 1,200 mg (three 400 mg tablets) 76-90kg: 1,600 mg (four 400 mg tablets) \> 90 kg: No dosage recommendations so these volunteers will only receive 1,600 mg (four 400 mg tablets)

Protocol document: