Medical Information Only. Always consult your healthcare provider before enrolling in any clinical trial.

NCT01231620 · ClinicalTrials.gov registry record · Phase 3

A Study of Intravenous Zanamivir Versus Oral Oseltamivir in Adults and Adolescents Hospitalized With Influenza

A Phase 3 study of Influenza, Human, sponsored by GlaxoSmithKline.

Completed
Registry status
Phase 3
Development phase
626
Enrollment target
20
Study locations

NCT01231620: Completed Phase 3 study of Influenza, Human, sponsored by GlaxoSmithKline.

NCT01231620 is a Phase 3 study of Influenza, Human that has completed, run by GlaxoSmithKline. The registered enrollment target is 626 participants, below the 16,189-participant average among 18 other Influenza, Human trials with a reported enrollment target (96% lower). The trial reports 20 study locations across 10 states. According to ClinicalTrials.gov, the official US trial registry.

View on ClinicalTrials.gov ↗

View your shortlist →

The verdict

NCT01231620, a Phase 3 study of Influenza, Human, has completed, sponsored by GlaxoSmithKline.

COMPLETED
Registry status
Phase 3
Development phase
626 participants
Enrollment target
20
Study locations

Study Summary

The purpose of this study is to test the safety and efficacy of zanamivir given intravenously and how well it works at two different doses in hospitalized adolescents and adults with flu. Zanamivir will be compared with oseltamivir, which is used for treating flu.

Primary Outcome

Clinical response is defined as the resolution of at least 4 of the 5 vital signs (temperature, oxygen saturation, respiratory status, heart rate, systolic blood pressure) within the respective resolution criteria, maintained for at least 24 hours, or hospital discharge, whichever occurred first. This analysis was performed for Influenza positive population, for those with symptom onset less than or equal to (\<=) 4 days, and for those on mechanical (mech) ventilation or in intensive care unit (

Conditions Studied

Interventions

  • DRUG Oseltamivir
  • DRUG Zanamivir
  • DRUG Placebo to match zanamivir
  • DRUG Placebo to match oseltamivir

Study Locations (20)

California

  • GSK Investigational Site - Chula Vista
  • GSK Investigational Site - Escondido
  • GSK Investigational Site - Fullerton
  • GSK Investigational Site - La Jolla
  • GSK Investigational Site - La Mesa
  • GSK Investigational Site - Oceanside

Florida

  • GSK Investigational Site - Orlando
  • GSK Investigational Site - Sarasota
  • GSK Investigational Site - Sunrise

Illinois

  • GSK Investigational Site - Chicago
  • GSK Investigational Site - Oak Park
  • GSK Investigational Site - Peoria

Georgia

  • GSK Investigational Site - Atlanta
  • GSK Investigational Site - Augusta

Alabama

  • GSK Investigational Site - Birmingham

Arizona

  • GSK Investigational Site - Phoenix

Colorado

  • GSK Investigational Site - Aurora

Connecticut

  • GSK Investigational Site - Stamford

Trial Details

FieldValue
Enrollment Target 626 participants
Start Date 2011-01-15
Est. Completion 2015-03-18
Phase Phase 3
GlaxoSmithKline

1,345 total trials

What the finished NCT01231620 record still lists

NCT01231620 is an interventional study that assigns participants to a tested intervention. The registered 626 participants enrollment target is mid-sized for trials with a published cap, below the 16,189-participant average among 18 other Influenza, Human trials with a reported enrollment target (96% lower).

The record links to 1 condition, with Influenza, Human appearing as the primary indexed condition, and to 4 interventions - of which Oseltamivir is the first listed.

NCT01231620 names 20 study sites across 10 states, led by California, Florida, Illinois.

Frequently Asked Questions

What is clinical trial NCT01231620 about?

NCT01231620 is a clinical study titled "A Study of Intravenous Zanamivir Versus Oral Oseltamivir in Adults and Adolescents Hospitalized With Influenza". The purpose of this study is to test the safety and efficacy of zanamivir given intravenously and how well it works at two different doses in hospitalized adolescents and adults with flu. Zanamivir will be compared with oseltamivir, which is used for treating flu.

What is the current status of trial NCT01231620?

This trial is currently completed. It is a Phase 3 study. The enrollment target is 626 participants. The study started on 2011-01-15. Estimated completion is 2015-03-18.

What conditions does trial NCT01231620 study?

This clinical trial studies the following conditions: Influenza, Human.

What interventions are being tested in trial NCT01231620?

The interventions under investigation include: Oseltamivir (DRUG), Zanamivir (DRUG), Placebo to match zanamivir (DRUG), Placebo to match oseltamivir (DRUG).

Who is sponsoring clinical trial NCT01231620?

This trial is sponsored by GlaxoSmithKline, which has 1,345 total clinical trials registered on ClinicalTrials.gov.

Where is trial NCT01231620 being conducted?

This trial has 20 study locations across Alabama, Arizona, California, Colorado, Connecticut. Contact the study sites directly through ClinicalTrials.gov for enrollment availability.

Similar trials for Influenza, Human

Matched on the same primary condition, ranked to surface studies in the same phase first, then by recruiting status, no relevance scoring or editorial curation.

Where NCT01231620's enrollment target sits among peer trials

626 10th of 18 higher than 9 of 18 other Influenza, Human trials

participants (enrollment target), bucketed by value

Each bar is a band; taller bars hold more other Influenza, Human trials. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source ClinicalTrials.gov registry export · 2026-08-08

Nationwide trials with similar profiles

Cross-condition peers matched on enrollment target and registry start date, not the same-condition list above.

Similar enrollment target

  • NCT06040827 · 626 participants

    A Multicenter, Postmarket Surveillance Study of Subjects With the Canary canturioTM te Tibial Extension

  • NCT05349227 · 625 participants · NA

    Comprehensive Outcomes for After Cancer Health

  • NCT06103864 · 625 participants · Phase 3

    A Phase III Study of Dato-DXd With or Without Durvalumab Compared With Investigator's Choice of Chemotherapy in Combination With Pembrolizumab in Patients With PD-L1 Positive Locally Recurrent Inoperable or Metastatic Triple-negative Breast Cancer

  • NCT06230510 · 625 participants · NA

    Milk-Tot Study: Impact of Whole Versus Low-fat Milk on Child Health

Similar registry start date

  • NCT05962346 · started 2026-12 · NA

    Fetal Endoscopic Tracheal Occlusion for Congenital Diaphragmatic Hernia

  • NCT07125183 · started 2026-12 · Phase 2

    Study on Efficacy and Tolerability of Weekly Doxorubicin in Elderly Patients With Advanced or Metastatic Leiomyosarcoma

  • NCT07292298 · started 2026-11 · Phase 2

    Phase 2 Single-Arm Rectal Cancer Brachytherapy for Patients With Low-Lying Residual Adenocarcinoma After Total Neoadjuvant Therapy to Improve Organ Preservation Rates

  • NCT04263285 · started 2026-10 · NA

    Treatment of Depression Post-SCI

Source: ClinicalTrials.gov NCT01231620, the US trial registry maintained by the National Library of Medicine. NCT01231620 (mid enrollment · wide site footprint · completed) retrieved and formatted by PlainTrial, see methodology.