This paper summarizes the applicability of in vitro and in vivo method
s to assess drug transport to the brain. In vitro methods: culture of
confluent monolayers of bovine brain endothelial cells which represent
the blood-brain barrier (BBB) and confocal laser scanning microscopy.
In vivo methods: BBB-clearance model and microdialysis in rats. Ascer
taining selectivity in BBB-transport in disease states is emphasized.