Phenylbutyric acid

Generic Name
Phenylbutyric acid
Brand Names
Ammonaps, Buphenyl, Olpruva 2 Gm Pack, Pheburane, Relyvrio
Drug Type
Small Molecule
Chemical Formula
C10H12O2
CAS Number
1821-12-1
Unique Ingredient Identifier
7WY7YBI87E
Background

Phenylbutyric acid is a fatty acid and a derivative of butyric acid naturally produced by colonic bacteria fermentation. It demonstrates a number of cellular and biological effects, such as relieving inflammation and acting as a chemical chaperone. It is used to treat genetic metabolic syndromes, neuropathies, and urea cycle disorders.

Indication

Phenylbutyric acid is used for the treatment of various conditions, including urea cycle

disorders, neonatal-onset deficiency, late-onset deficiency disease in patients with a history of hyperammonemic encephalopathy. Phenylbutyric acid must be combined with dietary protein restriction and, in some cases, essential amino acid supplementation.

Phenylbutyric acid, as sodium phenylbutyrate, is used in combination with tauroursodeoxycholic acid to treat amyotrophic lateral sclerosis (ALS) in adults.

Associated Conditions
Amyotrophic Lateral Sclerosis (ALS), Argininosuccinate Synthetase Deficiency (Citrullinemia), Carbamyl Phosphate Synthetase Deficiency, Ornithine Transcarbamylase Deficiency, Deficiencies in enzymes of the urea cycle, Neonatal-onset deficiency
Associated Therapies
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StratosPHere 2: study protocol for a response-adaptive randomised placebo-controlled ...

Hydroxychloroquine and phenylbutyrate, repurposed for haploinsufficiency and missense mutations, will be evaluated with standard of care against placebo in a trial. The primary outcome measures BMPR2 target engagement using a novel composite panel of gene expressions. Safety and efficacy will be assessed through adverse events, functional measures, and quality of life. The trial will recruit 40 participants from UK respiratory centres, with a focus on equitable access.
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