Sensitive analysis of plasma physostigmine levels using dual-cell electrochemistry in the redox mode.

A column liquid chromatographic method using dual-electrode, redox electrochemical detection has been developed for measuring plasma and cerebrospinal fluid physostigmine levels. The method is suitable for detecting drug levels in a geriatric population following oral ingestion of sustained-release physostigmine preparations and for determining the pharmacokinetics of these preparations in biological fluids.