Marihuana: Studies on the Disposition and Metabolism of Delta-9-Tetrahydrocannabinol in Man

Abstract
Δ9-Tetrahydrocannabinol (the major active component of marihuana) administered intravenously to normal human volunteers persists in plasma for more than 3 days (t1/2 = 56 hours). Its metabolites appear in plasma within 10 minutes after administration and persist along with the precursor compound. Δ9-Tetrahydrocannabinol is completely metabolized in man, and the radioactive metabolites are excreted in urine and feces for more than 8 days.