Variability of Sulfotransferase 1A1 Activity in Humans: an Approach to Improve Predictive Drug Response - Part I: Analysis of Intraindividual Variation in Healthy Adults

Volunteers will be screened at visit 1, and if they meet the inclusion/exclusion criteria they will receive the intervention at visit 2. At visit 2, complying subjects will receive a tablet containing 1 gram of paracetamol and have a blood sample collected 2 hours after administration; these procedures will be repeated on 2 more occasions (visits 3 and 4). The subjects will come for 5 visits during the study. Visit 1 and 2 must occur within 7 days of each other, visits 2, 3 and 4 will be four weeks (± 3 days) apart and visit 5 scheduled four weeks (± 3 days) after visit 4.