Fosfomycin was discovered in 1969 by scientists at the Spanish Penicillin and Antibiotics Company and is produced by Streptomyces fradiae. It may also be produced synthetically and is commercially available as the disodium salt for intravenous administration and as the calcium or trometamol salt for oral administration. In terms of chemical structure, fosfomycin is a phosphoenolpyruvate analog and contains a phosphonic group and an epoxide ring. Due to its ease of administration as a single 3-gram oral dose and desirable safety profile, fosfomycin has largely become a first-line therapeutic option for the treatment of uncomplicated urinary tract infections (UTIs) in females. Despite being FDA approved only for urinary tract infections, fosfomycin actually has a broad spectrum of activity and is active against both gram-positive and gram-negative bacteria. As such there is great interest in exploring the usefulness of fosfomycin for indications beyond the treatment of UTIs.
Science-backed PDE/ADE, OEL & OEB derivation by certified toxicologists with ex-agency experts -
Fosfomycin
Drug Overview
What is Fosfomycin?
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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View Inquiry List →Full OEL derivation · ADE/PDE value · Control band assignment · All cited references · EMA / ICH Q9 compliance
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.
Comprehensive Data Review
Assessment of pharmacology, toxicology, clinical data, literature, and available regulatory information.
Scientific Evaluation
Identification of critical endpoints and selection of appropriate exposure limits.
PDE / HBEL Derivation
Transparent and scientifically justified calculations aligned with global toxicological principles.
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.
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.
Regulatory expectation–driven assessments aligned with how authorities actually evaluate submissions.
Inspection-ready reports — scientifically defensible and audit-prepared from day one.
Faster review cycles with direct decision support from certified toxicologists (ERT, UKRT, DABT).
Practical implementation recommendations that translate science into actionable contamination control.
Reduced internal effort — offload complex assessments without sacrificing quality or defensibility.
Global reach across PDE/ADE, HBEL, OEL, OEB, cleaning validation, and impurity assessments.
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