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The Chloroquine for Influenza Prevention Trial (CHIP)

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified February 2010 by National University Hospital, Singapore.
Recruitment status was:  Active, not recruiting
Information provided by:
National University Hospital, Singapore Identifier:
First received: February 28, 2010
Last updated: NA
Last verified: February 2010
History: No changes posted
A randomised controlled trial to determine the efficacy of chloroquine for the prevention of influenza

Condition Intervention Phase
Drug: Chloroquine
Drug: Placebo
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Prevention
Official Title: A Randomised, Double-blind, Placebo Controlled Trial of Chloroquine for the Prevention of Influenza

Resource links provided by NLM:

Further study details as provided by National University Hospital, Singapore:

Primary Outcome Measures:
  • Laboratory-confirmed influenza-like illness [ Time Frame: 12 weeks ]

Secondary Outcome Measures:
  • Serologically-confirmed influenza infection (symptomatic or asymptomatic) [ Time Frame: 12 weeks ]
    Four-fold rise in influenza antibody titre at week 12 compared to the baseline sample

Enrollment: 1516
Study Start Date: November 2009
Estimated Study Completion Date: August 2010
Estimated Primary Completion Date: May 2010 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Chloroquine Drug: Chloroquine
Chloroquine phosphate 250mg capsule, two capsules daily for 7 days then 2 capsules once a week for a total treatment duration of 12 weeks
Other Names:
  • Chloroquine phosphate
  • Plaquenil
Placebo Comparator: Placebo Drug: Placebo
Placebo capsules, 2 capsules daily for 7 days then 2 capsules weekly for a total treatment duration of 12 weeks


Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Age 18 -65
  • Have the ability to provide informed consent
  • If a woman of child-bearing potential, willing to use contraception for the period of the trial

Exclusion Criteria:

  • Acute influenza-like illness at screening
  • History of psoriasis, porphyria cutanea tarda, epilepsy, myasthenia gravis, myopathy of any cause, cardiac arrhythmias, or serious hepatic or renal disease
  • Pregnancy or breast feeding
  • Current use of medication with known serious hepatotoxic effects
  • Current use of medication with known serious interaction with CQ: amiodarone, anticonvulsants, ciclosporin, digoxin, mefloquine, moxifloxacin
  • Current severe depression (as indicated by current use of antidepressant medication)
  • Known serious retinal disease
  • Current or recent (within the past 30 days) participation in any other clinical intervention trial.
  • Known G6PD deficiency
  • Vaccination for influenza (seasonal or H1N1 strain) within the 3 months prior to screening
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01078779

Investigational Medicines Unit, National University Hospital
Singapore, Singapore, 119074
Sponsors and Collaborators
National University Hospital, Singapore
Study Chair: Nicholas I Paton, MD FRCP National University, Singapore
Principal Investigator: Lawrence Lee, MD PhD National University, Singapore
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Professor Nicholas Paton, National University of Singapore Identifier: NCT01078779     History of Changes
Other Study ID Numbers: E/09/482
Study First Received: February 28, 2010
Last Updated: February 28, 2010

Keywords provided by National University Hospital, Singapore:
Randomised controlled trial
Respiratory virus infection

Additional relevant MeSH terms:
Influenza, Human
Orthomyxoviridae Infections
RNA Virus Infections
Virus Diseases
Respiratory Tract Infections
Respiratory Tract Diseases
Chloroquine diphosphate
Anti-Inflammatory Agents, Non-Steroidal
Analgesics, Non-Narcotic
Sensory System Agents
Peripheral Nervous System Agents
Physiological Effects of Drugs
Anti-Inflammatory Agents
Antirheumatic Agents
Antiprotozoal Agents
Antiparasitic Agents
Anti-Infective Agents
Antinematodal Agents
Amebicides processed this record on March 29, 2017