Extractables and Leachables

Extractables and leachables are critical considerations in the development and quality control of injectable drug products.

Extractables are chemical compounds that can be extracted from packaging materials, container closures, or delivery systems when exposed to solvents under exaggerated conditions (e.g., high temperatures, aggressive solvents).

Leachables are chemical compounds that migrate into the drug product under normal storage and use conditions. These can originate from the same sources as extractables but are typically present in lower concentrations.

Importance in Injectables

Safety: Both extractables and leachables can pose risks to patient safety if they are toxic or interact negatively with the drug product.

Regulatory Compliance: Regulatory agencies require thorough testing and documentation of extractables and leachables to ensure the safety and efficacy of the drug product .

Testing and Analysis

Extractables Studies: These studies simulate worst-case scenarios to identify potential leachables by using harsh solvents and conditions .

Leachables Studies: These studies focus on real-world conditions, using the actual drug product to identify compounds that migrate into the product over time .

Common sources of leachables in injectable drug products include:

Container Closure Systems: Components like rubber stoppers, vial caps, and seals can release leachables into the drug product.

Plastic Packaging: Materials such as syringes, IV bags, and tubing made from plastics like PVC, polyethylene, and polypropylene can leach additives, plasticizers, and other chemicals.

Glass Containers: Although generally inert, glass vials and ampoules can sometimes release trace elements or compounds, especially if they are treated or coated.

Elastomers: Used in seals and gaskets, elastomers can leach curing agents, antioxidants, and other additives.

Adhesives and Coatings: Used in labels, seals, and other packaging components, these can contribute leachables.