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Rilonacept

Published by U.S. Food and Drug Administration | U.S. Department of Health & Human Services | Metadata Last Checked: February 18, 2026 | Last Modified: 2025-03-17
Arcalyst (rilonacept) is a prescription medication manufactured by Kiniksa Pharmaceuticals (UK), Ltd., used to treat certain autoinflammatory conditions. It comes as a lyophilized powder in single-use vials for subcutaneous injection, with each vial containing 160 mg of rilonacept in 2 mL after reconstitution. This information was generated using AI and is provided for informational and research purposes only.

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