Brechbühler S, Fluehler H, Riess W, Theobald W
Arzneimittelforschung. 1978;28(3):480-3.
A spectrophotometric method for the quantitative determination of rifampicin in urine is described and its specificity and precision are discussed. It is shown that the mean cumulative urinary elimination of rifampicin is reproducible when the same dose is administered twice in two different experiments to the same group of volunteers. The percentage of the amount eliminated increases with increasing dose. The renal elimination of apparent rifampicin can be used as a parameter for assessment of relative bioavailability of rifampicin from oral dosage forms of the same nominal strength if an appropriate number of volunteers is involved in the test.
