Acquisition visit 2 (day 0)
Acquisition visit 2 started in the morning hours between 7:30 to 11:00 A.M. Before ingestion of the study medication, participants were asked about their health status, medication intake and psychotropic substance consumption since the screening visit. Then they were administered the study medication. Participants were asked not to eat, or drink beverages containing milk, in the hour before and after drug ingestion, as this can influence the absorption of doxycycline (