COVID prevention trial for seniors pulled before it started
NCT ID NCT04397328
First seen Jun 26, 2026 · Last updated Jun 26, 2026
Summary
This study aimed to see if hydroxychloroquine could prevent COVID-19 in older adults living in long-term care homes. It planned to give either the drug or a placebo to high-risk residents after they were exposed to the virus. However, the trial was withdrawn before enrolling anyone, so no data were collected.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
hydroxychloroquine
What this could lead to
If it had worked, this could have pointed toward a way to prevent COVID-19 in vulnerable older adults using a widely available drug.
What could go wrong
The trial was withdrawn before any participants were enrolled, so no results exist. Earlier studies on hydroxychloroquine for COVID-19 showed mixed or negative results and raised safety concerns.
Disclaimer
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This is a summary of
the original study
.
Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.