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.
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Aghajanian et al. (1964) studied this question.