Legal status by country
Is Sodium phenylbutyrate legal?
Written by Aaron CuhaReviewed Sep 2026
How Sodium phenylbutyrate is classified in the United States, United Kingdom, Australia and Canada, side by side. Each country has its own page with a direct answer, the regulator's approval status and what the classification means in practice.
All four countries, side by side
| Attribute | United States · FDA | United Kingdom · MHRA | Australia · TGA | Canada · Health Canada |
|---|---|---|---|---|
| Status | Approved | Approved | Approved | Approved |
| Classification | FDA-approved, prescription only | Licensed, prescription only (MHRA) | TGA-registered, prescription only | Health Canada approved, prescription only |
| Note | Approved for urea cycle disorders. A combination product containing it was approved for ALS and later withdrawn after the confirmatory phase 3 did not succeed. No ageing indication. | None recorded | None recorded | None recorded |
US FDA status: FDA-approved for urea cycle disorders. Also formed part of a combination product approved for amyotrophic lateral sclerosis that was subsequently withdrawn after its confirmatory trial failed. No ageing indication.. Reviewed Sep 2026.
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General information current as of Sep 2026, not legal advice. Classifications change; confirm with the regulator or a lawyer for a specific situation. Educational use only. This database summarizes published research. It is not medical advice and contains no dosing protocols or recommendations for personal use. The Longevity Archive has no vendor relationships.