CI

At a glance

ClinicalIndex Comparison Record
Phase 2Completed· 24 enrolled
Drug / intervention
Ondansetron 16 mg with Tariquidar +1 moredrug
Likely dose
Ondansetron 16 mg with Tariquidarfrom record
Structured eligibility isn't available for this trial yet — see the full criteria in the Eligibility tab below.

Standardized by ClinicalIndex from the ClinicalTrials.gov record · verify against the source.

Search/NCT04603066
NCT04603066Phase 2Completed

Administration of Ondansetron With P-glycoprotein Inhibitor Tariquidar in Patients With Neuropathic Pain

Washington University School of Medicine·interventional·Posted Oct 26, 2020·Updated Aug 14, 2025

In Brief

A Phase 2 clinical trial evaluating Ondansetron 16 mg with Tariquidar and Ondansetron 16 mg with Placebo for Neuropathic Pain. Completed, enrolled 24 participants across 1 site.

Detailed Summary

Prospective, randomized, double-blind, placebo controlled, cross-over proof of concept study. To determine the pharmacokinetics and tolerability of co-administration of 5-HT3R antagonist ondansetron with a P-glycoprotein inhibitor tariquidar, in patients with neuropathic pain.

Study Details

Study Typeinterventional
Allocation--
Masking--
Primary Purpose--
CountriesUnited States
Collaborators--

Timeline

Phase 2CompletedFinished
202120222023202420252026
First PostedOct 26, 2020
Enrollment StartJan 31, 2021
Primary CompletionOct 21, 2023
Study CompletionNov 3, 2023
TodayJul 2, 2026
Enrollment to primary: 2.7 yearsPosted 5.7 years ago

Interventions

Ondansetron 16 mg with Tariquidardrug

In randomized order, each participant will receive two IV infusions of ondansetron, 3 weeks apart; one with placebo (D5W), and one with tariquidar (4mg/kg dose in D5W) administered IV over 60 minutes. Ondansetron will be diluted in 100mL 0.9% normal saline, and tariquidar will be diluted in 500mL D5W.

Ondansetron 16 mg with Placebodrug

In randomized order, each participant will receive two IV infusions of ondansetron, 3 weeks apart; one with placebo (D5W), and one with tariquidar (4mg/kg dose in D5W) administered IV over 60 minutes. Ondansetron will be diluted in 100mL 0.9% normal saline, and tariquidar will be diluted in 500mL D5W.