The effect of probenecid on the free and conjugaed 3-methoxy-4-hydroxyphenylglycol (MHPG) in lumbar cerebrospinal fluid.

ABSTRACT

Free and conjugated lumbar cerebrospinal fluid 3-methoxy-4-hydroxyphenylglycol (MHPG) was measured before and after probenecid treatment in 12 schizophrenic patients by a gas liquid chromatography-mass fragmentographic procedure. Neither the free nor conjugated MHPG was appreciably altered by probenecid. Total MHPG was statistically increased by probenecid but not to the point that the probenecid test would be clinically useful for estimating norepinephrine turnover from probenecid-induced changes in MHPG concentrations.