New pill for rheumatoid arthritis passes first safety check in small study
NCT ID NCT05858788
First seen Jun 26, 2026 · Last updated Jun 26, 2026
Summary
This early-stage study tested a new oral drug called SAR441566 in 10 healthy Japanese men to see how safe it is and how the body processes it. The drug is being developed for rheumatoid arthritis, an autoimmune disease that causes joint pain and swelling. The study only looked at safety and drug levels in the blood, not whether it actually treats arthritis.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
SAR441566 (oral tablet)
What this could lead to
If successful, this could lead to a new oral treatment option for rheumatoid arthritis, helping control the disease with fewer side effects.
What could go wrong
This is a very early Phase 1 study in only 10 healthy men, not patients. It only checks safety and drug levels, not whether it works for arthritis. Many drugs fail in later trials.
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.
Contacts and locations
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Locations
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Parexel International-Site Number:8400001
Glendale, California, 91206, United States