“…Bismuth subcitrate, in different forms, is the most extensively studied bismuth compound. "Alarm" levels can be exceeded for a short time after investigation, without toxic consequences (Nwokolo et al 1990, Raedesch et al 1990, Nwokolo et al 1990). At 2 hours after a single dose of 108 mg Bi as colloidal subcitrate, plasma levels in two volunteers were measured as 1.62 and 24.7 mg L À1 (Versieck et al 1992), while steady-state plasma levels after treatment for 4 -8 weeks ranged between 3 and 58 mg L À1 (Serfontein 1979).…”