Last Updated: November 9, 2026

BUPHENYL Drug Patent Profile

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When do Buphenyl patents expire, and when can generic versions of Buphenyl launch?

Buphenyl is a drug marketed by Horizon Therap Us and is included in two NDAs.

The generic ingredient in BUPHENYL is sodium phenylbutyrate. There is one drug master file entry for this compound. Seven suppliers are listed for this compound. Additional details are available on the sodium phenylbutyrate profile page.

DrugPatentWatch® Litigation and Generic Entry Outlook for Buphenyl

A generic version of BUPHENYL was approved as sodium phenylbutyrate by PH HEALTH on April 15th, 2016.

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Summary for BUPHENYL
Recent Clinical Trials for BUPHENYL

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SponsorPhase
National Jewish HealthPhase 1/Phase 2
Horizon Pharma Ireland, Ltd., Dublin IrelandPhase 1/Phase 2
University of Alabama at BirminghamPhase 1/Phase 2

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Pharmacology for BUPHENYL

US Patents and Regulatory Information for BUPHENYL

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Horizon Therap Us BUPHENYL sodium phenylbutyrate POWDER;ORAL 020573-001 Apr 30, 1996 DISCN Yes No ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
Horizon Therap Us BUPHENYL sodium phenylbutyrate TABLET;ORAL 020572-001 May 13, 1996 DISCN Yes No ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Exclusivity Expiration

EU/EMA Drug Approvals for BUPHENYL

Company Drugname Inn Product Number / Indication Status Generic Biosimilar Orphan Marketing Authorisation Marketing Refusal
Eurocept International B. V. Pheburane sodium phenylbutyrate EMEA/H/C/002500Treatment of chronic management of urea-cycle disorders. Authorised no no no 2013-07-30
Immedica Pharma AB Ammonaps sodium phenylbutyrate EMEA/H/C/000219Ammonaps is indicated as adjunctive therapy in the chronic management of urea cycle disorders, involving deficiencies of carbamylphosphate synthetase, ornithine transcarbamylase orargininosuccinate synthetase.It is indicated in all patients with neonatal-onset presentation (complete enzyme deficiencies, presenting within the first 28 days of life). It is also indicated in patients with late-onset disease(partial enzyme deficiencies, presenting after the first month of life) who have a history of hyperammonaemic encephalopathy. Authorised no no no 1999-12-07
>Company >Drugname >Inn >Product Number / Indication >Status >Generic >Biosimilar >Orphan >Marketing Authorisation >Marketing Refusal

Supplementary Protection Certificates for BUPHENYL

Patent Number Supplementary Protection Certificate SPC Country SPC Expiration SPC Description
0957929 06C0021 France ⤷  Start Trial PRODUCT NAME: PEGAPTANIB SODIUM; REGISTRATION NO/DATE: EU/1/05/325/001 20060131
0788511 SPC/GB08/036 United Kingdom ⤷  Start Trial PRODUCT NAME: MICAFUNGIN AND PHARMACEUTICALLY ACCEPTABLE SALTS THEREOF IN PARTICULAR MICAFUNGIN SODIUM; REGISTERED: UK EU/1/08/448/001 20080425; UK EU/1/08/448/002 20080425
1713823 1490064-1 Sweden ⤷  Start Trial PRODUCT NAME: SIMEPREVIR, OR A PHARMACEUTICALLY ACCEPTABLE SALT THEREOF, INCLUDING SIMEPREVIR SODIUM; REG. NO/DATE: EU/1/14/924 20140516
>Patent Number >Supplementary Protection Certificate >SPC Country >SPC Expiration >SPC Description
DrugChatter Q&A for BUPHENYL

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