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 However, the trial was withdrawn before enrolling anyone, so no data were collected.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- The trial was withdrawn before any participants were enrolled, so no results exist.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.
This is an AI summary of the original study and may miss details. Read our disclaimer.
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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.
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