Medicine and Health Sciences Commons^™

Significant Inhibition Of Protein Binding Of Phenytoin, Sheril Alexander, Jesse Flores, Henrietta Ofuluozor, Mariana Babayeva

Touro College of Pharmacy (New York) Publications and Research

Aim: This research was aimed to assess the potential for inhibition of protein binding of phenytoin by tizoxanide in human plasma. Phenytoin was used because studies have proven to be a highly plasma protein-bound drug with a narrow therapeutic index and non-linear pharmacokinetics. Tizoxanide is another highly protein-bound active metabolite of an anti-infective prodrug nitazoxanide. Both drugs are expected to be administered together due to their therapeutic indications.

Study Design: The study was divided into two phases. Phase 1 produced a reference line of phenytoin protein binding values. Phase 2 was conducted to reveal the effect of the interactant tizoxanide …

Protein Binding Drug-Drug Interaction Between Warfarin And Tizoxanide In Human Plasma, Eduard Mullokandov, Jennifer Ahn, Andrew Szalkiewicz, Mariana Babayeva

Touro College of Pharmacy (New York) Publications and Research

The goal of the in vitro research was to evaluate the potential for inhibition of warfarin protein binding by tizoxanide. Warfarin was of particular interest for the present investigation because it has been shown to be highly bound to plasma proteins and is a narrow therapeutic index drug. Tizoxanide is an active metabolite of an anti-infective prodrug nitazoxanide and also highly protein-bound medication. Both drugs are expected to be co-administered clinically. Protein binding of warfarin was investigated using a centrifugal ultrafiltration technique. Co-administration of tizoxanide significantly inhibited protein binding of warfarin for all concentrations tested. Tizoxanide increased free fraction (fu) …