Insight · Industry Report
Annex 1 and Pre-Filled Syringes: What Changed, What to Do
The EU GMP Annex 1 revision tightens contamination control for sterile manufacturing. Here is what it means for PFS lines.

Key Takeaway
The EU GMP Annex 1 revision tightens contamination control for sterile manufacturing. Here is what it means for PFS lines.
The revised EU GMP Annex 1 (effective August 2023) has reshaped how pre-filled syringe lines are designed and qualified. The headline change: a mandatory Contamination Control Strategy (CCS) covering every step from incoming components to final sterile closure.
Key implications for PFS lines:
- Isolator or RABS is now the de-facto baseline
- Pre-use post-sterilization integrity testing (PUPSIT) for sterilizing filters
- Continuous viable and non-viable particle monitoring
- Documented contamination control strategy reviewed by quality
Manufacturers retrofitting older filling lines should plan for 9–18 months of upgrade and re-qualification.
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