A Nitrite Excipient Database: A Useful Tool to Support N-Nitrosamine Risk Assessments for Drug Products

Area of Science:

• Pharmaceutical Sciences
• Drug Development
• Analytical Chemistry

Background:

• N-Nitrosamine contamination is a critical concern in pharmaceutical development.
• Both drug substance and formulation processes contribute to nitrosamine presence.
• Nitrite in excipients interacting with amines is a key risk factor for nitrosamine formation.

Purpose of the Study:

• To establish a shared database of validated nitrite concentrations in pharmaceutical excipients.
• To provide a framework for assessing nitrosamine formation risk in drug products.
• To address the lack of validated nitrite data hindering risk assessment.

Main Methods:

• Creation and maintenance of a central database by Lhasa Limited.
• Data contribution from pharmaceutical company members on excipient nitrite levels.
• Measurement of nitrite concentrations using validated analytical procedures.

Main Results:

• Nitrite content and batch-to-batch variance differ significantly among excipients.
• In solid dosage forms, fillers (diluents) contribute most to nitrite levels, averaging 1 µg/g.
• Excipient vendor and manufacturing processes substantially influence average nitrite content.

Conclusions:

• Excipient nitrite levels vary by type and vendor, impacting nitrosamine risk.
• Understanding excipient nitrite contributions is vital for pharmaceutical quality control.
• Optimizing excipient sourcing and manufacturing can mitigate nitrosamine formation risks.