Previously published plasma concentrations of LSD‐25, observed following intravenous iniection of 2 mcg. per kilogram of LSD‐25, have been found to be explained by the two‐compartment open model. Performance scores on arithmetic tests were shown to be highly linearly correlated with the concentration in the “tissue” (outer) compartment. The estimated volume of the plasma (inner) compartment was...
Two micrograms per kilogram of LSD‐25 was administered intravenously to five normal human subjects. The concentration of drug in plasma was determined serially over the subsequent 8 hours. LSD‐25 was found to be present in human plasma in relatively large quantities during the period of peak effect. The half‐life of LSD‐25 in human plasma was calculated to be 175 minutes.