The pharmacokinetics of L-tryptophan following its intravenous and oral administration.
The pharmacokinetics of L-tryptophan (5 g and 7.5 g) have been studied after its intravenous administration to healthy subjects and the results compared with those obtained after oral administration (0.7 g-3.5 g). In order to do this, we have re-analysed previously published data relating to oral administration. The data obtained following the oral administration of L-tryptophan suggest that the total body clearance and apparent volume of distribution are saturable. The pharmacokinetics of tryptophan after intravenous administration of 5 g and 7.5 g were similar to those after the oral administration of 25 and 50 mg kg-1 (i.e. 1.75 g and 3.5 g). Similar pharmacokinetic values were obtained following intravenous tryptophan when the same subjects were retested after a period of 2-4 weeks.
D000284:Administration, Oral; D000328:Adult; D006801:Humans; D007275:Injections, Intravenous; D007700:Kinetics; D008297:Male; D013997:Time Factors; D014364:Tryptophan / Q000008:administration & dosage / Q000378:metabolism*
D014364:Tryptophan