[Intestinal excretion of nystatin during and after oral administration to newborn infants at risk].

The concentrations of nystatin excreted with faeces during and after oral application of 3 x 150,000 IU/d, either continuously for 14-21 days or every second day were determined in 42 newborns at risk by means of a bioassay (agar diffusion test). Results indicate that nystatin is distributed heterogeneously in the gastrointestinal tract. The excretion occurs discontinuously. 24 to 48 h after beginning of therapy there were effective concentrations of nystatin in the faeces. The daily application of 3 x 150,000 IU nystatin is recommended.