Summary
The concentration of 5,5-diphenylhydantoin (DPH) in serum was determined at selected time intervals in seven healthy male volunteers starting 10 h after an oral dose of 400 mg sodium DPH was given. The data were analyzed according to a one-compartment model assuming first-order kinetics. The mean serum half-life was 19.28 h±5.87 (SD). A positive correlation coefficient (r=0.84, p<0.05) was found between the serum DPH half-life and the serum amobarbital half-life in the seven subjects. The urinary levels of free plus conjugated 5-(p-hydroxyphenyl)-5-phenylhydantoin were determined for 12 h periods over a minimum of two days following the 400 mg oral dose of sodium DPH. Subjects with a short DPH half-life tended to excrete in urine a greater amount ofp-HPPH as compared to subjects with a long DPH half-life. In the case of one subject, the urinary excretion ofp-HPPH plateaued five days after DPH administration and the apparent elimination half-life determined from thep-HPPH urinary excretion data was 19.16 h as compared to the value of 19.53 h calculated from the DPH serum levels.
Similar content being viewed by others
References
Vesell, E.S.: Factors causing interindividual variations of drug concentrations in blood. Clin. Pharmacol. Ther.16 135–148 (1974)
Kadar, D., Inaba, T., Endrenyi, L., Johnson, G.E., Kalow, W.: Comparative drug elimination capacity in man — glutethimide, amobarbital, antipyrine, and sulfinpyrazone. Clin. Pharmacol. Ther.14 552–560 (1973)
Balasubramaniam, K., Lucas, S.B., Mawer, G.E., Simons, P.J.: The kinetics of amylobarbitone metabolism in healthy men and women. Brit. J. Pharmacol.39 564–572 (1970)
Davies, D.S., Thorgeirsson, S.S.: Mechanism of hepatic drug oxidation and its relationship to individual differences in rates of oxidation in man. Ann. N.Y. Acad. Sci.179 411–420 (1971)
Curry, S.H., Riddall, D., Gordon, J.S., Simpson, P., Binns, T.B., Rondel, R.K., McMartin, C.: Disposition of glutethimide in man. Clin. Pharmacol. Ther.12 849–857 (1971)
Dill, W.A., Kazenko, A., Wolf, L.M., Glazko, A.J.: Studies on 5,5-diphenylhydantoin (Dilantin) in animals and man. J. Pharmacol. exp. Ther.118 270–279 (1956)
Glazko, A.J., Chang, T., Baukema, J., Dill, W.A., Goulet, J.R., Buchanan, R.A.: Metabolic disposition of diphenylhydantoin in normal human subjects following intravenous administration. Clin. Pharmacol. Ther.10 498–504 (1969)
Arnold, K., Gerber, N.: The rate of decline of diphenylhydantoin in human plasma. Clin. Pharmacol. Ther.11 121–134 (1970)
Lund, L., Alvan, G., Berlin, A., Alexanderson, B.: Pharmacokinetics of single and multiple doses of phenytoin in man. Europ. J. clin. Pharmacol.7 81–86 (1974)
Chang, T., Glazko, A.J.: Diphenylhydantoin biotransformation. In: Antiepileptic Drugs, (eds. D.M. Woodbury, J.K. Penry, R.P. Schmidt) pp. 149–162. New York: Raven Press 1972
Brien, J.F., Inaba, T.: Determination of low levels of 5,5-diphenylhydantoin in serum by gas-liquid chromatography. J. Chromatogr.88 265–270 (1974)
Inaba, T., Brien, J.F.: Determination of the major urinary metabolite of diphenylhydantoin by high-performance liquid chromatography. J. Chromatogr.80 161–165 (1973)
Riegelman, S., Loo, J.C.K., Rowland, M.: Shortcomings in pharmacokinetic analysis by conceiving the body to exhibit properties of a single compartment. J. pharm. Sci.57 117–123 (1968)
Panalaks, T.: A method for evaluation of physiological availability of diphenylhydantoin by urinary analysis. Clin. chim. Acta8, 968–970 (1963)
Cummings, A.J., Martin, B.K., Park, G.S.: Kinetic considerations relating to the accrual and elimination of drug metabolites. Brit. J. Pharmacol.29 136–149 (1967)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Brien, J.F., Inaba, T. & Kalow, W. Comparative drug elimination in man — Diphenylhydantoin and amobarbital. Eur J Clin Pharmacol 9, 79–83 (1975). https://doi.org/10.1007/BF00613433
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00613433