Famciclovir-d4

Stable heavy isotopes of hydrogen, carbon, and other elements have been incorporated into drug molecules, largely as tracers for quantitation during the drug development process. Deuteration has gained attention because of its potential to affect the pharmacokinetic and metabolic profiles of drugs^[1].

References:
[1]. Russak EM, et al. Impact of Deuterium Substitution on the Pharmacokinetics of Pharmaceuticals. Ann Pharmacother. 2019;53(2):211-216.
[2]. Harrell AW, Wheeler SM, Pennick M, Evidence that famciclovir (BRL 42810) and its associated metabolites do not inhibit the 6 beta-hydroxylation of testosterone in human liver microsomes. Drug Metab Dispos. 1993 Jan-Feb;21(1):18-23.
[3]. Perry CM, Wagstaff AJ. Famciclovir. A review of its pharmacological properties and therapeutic efficacy in herpesvirus infections. Drugs. 1995 Aug;50(2):396-415.
[4]. Trépo C, Jezek P, Atkinson G, Famciclovir in chronic hepatitis B: results of a dose-finding study. J Hepatol. 2000 Jun;32(6):1011-8.
[5]. Filer CW, Ramji JV, Allen GD, Metabolic and pharmacokinetic studies following oral administration of famciclovir to the rat and dog. Xenobiotica. 1995 May;25(5):477-90.
[6]. Wutzler P, Ulbricht A, Färber I. Antiviral efficacies of famciclovir, valaciclovir, and brivudin in disseminated herpes simplex virus type 1 infection in mice. Intervirology. 1997;40(1):15-21.