A new carbamazepine metabolite in uraemic filtrate.

1. After administration of carbamazepine (Tegretal) to an epileptic patient suffering also from uraemia, a previously unknown metabolite was detected in the haemofiltrate. It was identified as the 10,11-dihydro-10-hydroxy-carbamazepine-O-beta-glucuronide. 2. Its identification was accomplished mainly by electron impact (EI), liquid secondary ion (LSI) mass spectrometry and n.m.r. spectroscopy.