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Abstract
The gastrointestinal blood loss during intake of two ampicillin esters (pivampicillin and bacampicillin) was studied in 10 male volunteers. A radioactive chromium method was used. The study was performed with a double-blind cross-over technique. Pivampicillin seemed to give a slightly higher increase in gastrointestinal blood loss compared to placebo and bacampicillin but these bleedings are probably of no clinical significance.