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Data updated: Mar 10, 2026

CEREBYX

FOSPHENYTOIN SODIUM
Neurology Approved 1996-08-05
2
Indications
--
Phase 3 Trials
29
Years on Market

Details

Status
Prescription
First Approved
1996-08-05
Routes
INJECTION
Dosage Forms
INJECTABLE

Companies

Active Ingredient: FOSPHENYTOIN SODIUM

CEREBYX Approval History

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What CEREBYX Treats

2 indications

CEREBYX is approved for 2 conditions since its original approval in 1996. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Generalized Tonic-Clonic Status Epilepticus
  • Seizures
Source: FDA Label

CEREBYX Boxed Warning

CARDIOVASCULAR RISK ASSOCIATED WITH RAPID INFUSION RATES The rate of intravenous CEREBYX administration should not exceed 150 mg phenytoin sodium equivalents (PE) per minute in adults and 2 mg PE/kg/min (or 150 mg PE/min, whichever is slower) in pediatric patients because of the risk of severe hypotension and cardiac arrhythmias. Careful cardiac monitoring is needed during and after administering intravenous CEREBYX. Although the risk of cardiovascular toxicity increases with infusion rates abov...

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Trial Timeline

Full development history with FDA approval milestones

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Understanding FDA Approval Types
Count Type What it means
- ORIG Original approval - drug first enters market
- SUPPL - Efficacy New indication (new disease/condition approved)
- SUPPL - Labeling Label text changes (warnings, dosing updates)
- SUPPL - Manufacturing Production changes (new facility)
- SUPPL - Chemistry Formulation changes (new dosage strength)

Green lines in the timeline show ORIG and Efficacy approvals - the clinically meaningful milestones.

CEREBYX FDA Label Details

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Indications & Usage

FDA Label (PDF)

CEREBYX is indicated for the treatment of generalized tonic-clonic status epilepticus and prevention and treatment of seizures occurring during neurosurgery. CEREBYX can also be substituted, short-term, for oral phenytoin. CEREBYX should be used only when oral phenytoin administration is not possible [see Dosage and Administration and Warnings and Precautions ] . CEREBYX is indicated for the treatment of generalized tonic-clonic status epilepticus and prevention and treatment of seizures occurring during neurosurgery. CEREBYX can also be substituted, as short-term use, for oral phenytoin. CERE...

⚠️ BOXED WARNING

WARNING: CARDIOVASCULAR RISK ASSOCIATED WITH RAPID INFUSION RATES The rate of intravenous CEREBYX administration should not exceed 150 mg phenytoin sodium equivalents (PE) per minute in adults and 2 mg PE/kg/min (or 150 mg PE/min, whichever is slower) in pediatric patients because of the risk of sev...

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Data Sources

Data sourced from official FDA and NIH databases. Click links to verify on original sources.