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phenylbutyrate

Phase 2

Medium-chain Acyl-CoA Dehydrogenase Deficiency | Small molecule | Rare Disease |Zevra Therapeutics, Inc.|Trials Updated: Aug 15, 2025

phenylbutyrate target and mechanism

Molecular targetHDACs
ModalitySmall molecule

Also known as Sodium phenylbutyrate

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials2
Total Enrollment25

FDA Designations

No designations recorded

phenylbutyrate clinical trials

phenylbutyrate · 2 trials · 2 indications

Phase 2 1Phase 1 1
NCT06773026Study of Sodium Phenylbutyrate (ACER-001) for the Treatment of Pediatric and Adults Patients With Medium Chain Acyl-CoA Dehydrogenase Deficiency (MCADD)Medium-chain Acyl-CoA Dehydrogenase Deficiency
RECRUITING24 Analytics
PHASE2RECRUITING
Study of Sodium Phenylbutyrate (ACER-001) for the Treatment of Pediatric and Adults Patients With Medium Chain Acyl-CoA Dehydrogenase Deficiency (MCADD)
Medium-chain Acyl-CoA Dehydrogenase DeficiencyUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of participants with treatment related adverse events as assessed by CTCAE v5.0
5 weeks
Number of treatment related adverse events
2 years

Secondary Endpoints

Length of time before glucose falls below 60 mg/dL
5 weeks
Length of time before glucose falls below 70 mg/dL
5 weeks
Length of time before glucose falls below 80 mg/dL
5 weeks
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
4.0 g/m2/day BID sodium phenylbutyrateEXPERIMENTALUp to 24 subjects (12: ages 4-9 years old; 12:10 years of age and older) will be randomized to take 4.0 g/m2/day divided into two daily doses
sodium phenylbutyrateEXPERIMENTALa single patient will take sodium phenylbutyrate (ACER-001) current at a dose of 12 g/day; dose will be modified if the patient gains more than 5 kg of weight

Interventions

NameTypeDescription
Sodium phenylbutyrateDRUGOpen-label design with doses of sodium phenylbutyrate at 4.0 g/m2/day
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Eligibility Criteria

Age Range4 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites1

Inclusion Criteria: 1. A diagnosis of MCADD and molecular confirmation of at least one copy of the common c.985A\>G mutation. 2. ≥4 years of age 3. Able to perform and comply with study activities placement of a continuous glucose monitor, IV catheter, and all blood draws. 4. Negative pregnancy tes...

Countries:United States
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Frequently asked questions about phenylbutyrate

What is phenylbutyrate used for?

Phenylbutyrate, also known as sodium phenylbutyrate, is an investigational small molecule being studied for the treatment of combined D,L-2-hydroxyglutaric aciduria and medium-chain acyl-CoA dehydrogenase deficiency. It is currently in clinical development and has not been approved by the FDA.

What does phenylbutyrate target?

Phenylbutyrate targets histone deacetylases (HDACs). By inhibiting HDACs, it may influence gene expression and cellular processes relevant to the metabolic conditions it is being studied for. The drug is being evaluated for its potential therapeutic effects in these rare diseases.

Who makes phenylbutyrate?

Phenylbutyrate is being developed by Zevra Therapeutics, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol ZVRA. The company is conducting clinical trials to evaluate the drug's safety and efficacy in patients with specific metabolic disorders.

What phase is phenylbutyrate in?

Phenylbutyrate is in early clinical development. One trial is in Phase 1 for combined D,L-2-hydroxyglutaric aciduria, and another is in Phase 2 for medium-chain acyl-CoA dehydrogenase deficiency. The drug is investigational and has not received regulatory approval.

What clinical trials is phenylbutyrate in?

Phenylbutyrate is being studied in two clinical trials. NCT07125066 is a Phase 1 open-label study in patients with combined D,L-2-hydroxyglutaric aciduria. NCT06773026 is a Phase 2 study in pediatric and adult patients with medium-chain acyl-CoA dehydrogenase deficiency. Both trials are enrolling in the United States.

Is phenylbutyrate the same as sodium phenylbutyrate?

Yes, phenylbutyrate is also known as sodium phenylbutyrate. The drug is being developed under the name ACER-001 in clinical trials. These names refer to the same investigational compound being studied for metabolic disorders.