Toxicology Report

Science-backed PDE/ADE, OEL & OEB derivation by certified toxicologists with ex-agency experts -

Valproic Acid

Drug Overview

What is Valproic Acid?

CAS No: 99-66-1

Valproic Acid is a carboxylic or inorganic acid with defined pKₐ value governing its ionisation state across the pH range of biological fluids and pharmaceutical formulations. In pharmaceutical development, Valproic Acid serves roles including counter-ion selection for API salt formation, pH adjustment and buffering in liquid formulations, and chemical reagent in API synthesis. Toxicological assessment for PDE derivation evaluates local irritancy effects on gastrointestinal mucosa, skin, and respiratory epithelium alongside systemic metabolic consequences of absorbed quantities, with the most sensitive endpoint in the most relevant study forming the POD.

The intraspecies uncertainty factor F2 for Valproic Acid covers the range of pharmacokinetic and pharmacodynamic variability within the human population, ensuring the derived PDE is protective for sensitive subgroups including paediatric patients with immature CYP450 activity, elderly patients with reduced hepatic and renal clearance, patients with

To derive PDE/ADE, OEL, and OEB values, Masuu Global follows a scientifically justified, risk-based toxicological assessment approach in accordance with internationally recognized guidelines and industry best practices that are widely accepted by regulatory authorities, including European Medicines Agency (EMA), Pharmaceutical Inspection Co-operation Scheme (PIC/S), and Agência Nacional de Vigilância Sanitária (ANVISA).

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What's included:
Full OEL derivation · ADE/PDE value · Control band assignment · All cited references · EMA / ICH Q9 compliance
9,000+
Toxicological & Exposure
Assessment Reports Delivered
70+
Subject Matter Experts
across global operations
12
In-House Ex-Agency
Toxicologists
3
Certification Bodies:
ERT · UKRT · DABT

Regulatory Framework

Assessment Methodology

Masuu Global follows a scientifically justified, risk-based toxicological approach aligned with internationally recognized guidelines accepted by EMA, PIC/S, and ANVISA.

EMA – Guideline on Setting Health-Based Exposure Limits (HBELs)

Provides the framework for establishing scientifically justified PDE/ADE values for use in shared manufacturing facilities.

PIC/S – Shared Facilities and Contamination Control Guidance

Supports the application of HBEL-based approaches for cross-contamination prevention and cleaning validation.

ICH Q9 – Quality Risk Management

Provides a structured methodology for risk identification, assessment, control, communication, and review.

ICH M7 – Assessment and Control of DNA-Reactive (Mutagenic) Impurities (where applicable)

Applied for compounds with potential mutagenic or genotoxic concerns.

Risk-Based Toxicological Assessment

Comprehensive evaluation of available toxicological and pharmacological data, including NOAEL, LOAEL, BMDL, pharmacological potency, carcinogenicity, reproductive and developmental toxicity, sensitization potential, and target organ toxicity.

Weight-of-Evidence (WoE) Approach

Integration and critical review of all relevant data sources, including non-clinical studies, clinical studies, human exposure data, pharmacological information, post-marketing safety data, and structure–activity relationship (SAR/QSAR) assessments.

How We Work

Report Preparation Process

Every assessment moves through a rigorous five-stage workflow — from data gathering to regulatory-ready delivery.

01

Comprehensive Data Review

Assessment of pharmacology, toxicology, clinical data, literature, and available regulatory information.

02

Scientific Evaluation

Identification of critical endpoints and selection of appropriate exposure limits.

03

PDE / HBEL Derivation

Transparent and scientifically justified calculations aligned with global toxicological principles.

04

Ex-Agency Expert Review (Our Differentiator)

Reports are reviewed with an ex-agency perspective, bringing regulatory expectations, inspection readiness, and practical implementation into every assessment.

05

Final Report Delivery

Regulatory-ready reports with scientific rationale, calculations, and clear recommendations by certified toxicologists (ERT, UKRT and DABT).

Ex-Agency Advantage

Why Masuu Global?

Our ex-agency toxicologists bring a practical regulatory perspective that transforms how assessments are built, reviewed, and defended.

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Regulatory expectation–driven assessments aligned with how authorities actually evaluate submissions.

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Inspection-ready reports — scientifically defensible and audit-prepared from day one.

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Faster review cycles with direct decision support from certified toxicologists (ERT, UKRT, DABT).

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Practical implementation recommendations that translate science into actionable contamination control.

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Reduced internal effort — offload complex assessments without sacrificing quality or defensibility.

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Global reach across PDE/ADE, HBEL, OEL, OEB, cleaning validation, and impurity assessments.

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