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Biologics Mixing, Diluting, and Repackaging: FDA Draft Guidance

Article

Last week the US Food and Drug Administration (FDA) issued a revised draft guidance detailing its policies on mixing, diluting, and repackaging certain types of biological products outside of the scope of an approved biologics license application (BLA).

Diluting or mixing a biological product with other components, or repackaging a biological product by removing it from its approved container-closure system and transferring it to another container-closure system, in the absence of manufacturing controls, is highly likely to affect the safety and/or effectiveness of the biological product. The FDA says even minor manipulations of biologics can result in quality or safety issues due to their unique properties.

There are instances where appropriate to mix or dilute a biological product to meet the needs of specific patients. "For example, for some biological products there is no licensed pediatric strength and/or dosage form, so the product is diluted for use in pediatric patients." While there are exemptions from certain federal regulations for compounded drugs under sections 503A and 503B of the Drug Quality and Security Act, these exemptions do not apply to biological products licensed under sections 351(a) or (k) of the Public Health Service Act.

In accordance, the FDA says that any biological product that is mixed, diluted, or repackaged outside the scope of an approved BLA is an "unlicensed biological product." It also does not intend to take actions for violations of section 351 of the PHS Act or sections 502(f)(1) or 582 of the FD&C Act if a state-licensed pharmacy, a federal facility, or an outsourcing facility mixes, dilutes, or repackages a biological product" in accordance with the guidance.

The guidance does not apply to investigational new drugs being studied under a new drug application or radioactive biological products.

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