21 CFR Part 4 - Regulation of Combination Products

What it says

Combination products, such as prefilled syringes, autoinjectors and drug-device combinations, must comply with cGMP requirements applicable to their constituent parts, with manufacturers permitted to demonstrate compliance through a streamlined approach, fully implementing either the drug cGMP or device QMSR framework as the primary system, supplemented with specific additional requirements from the other framework.

Paraphrased for plain-language clarity. Always verify against the current published regulation text.

What it means in practice

• Combination products sit at the intersection of drug and device regulatory frameworks, and Part 4 exists specifically to resolve the practical question of which cGMP system, or what combination, actually applies to a product with both drug and device constituent parts.
• The streamlined approach allows a manufacturer to designate either the drug cGMP framework under Part 211 or the device QMSR framework as primary, then layer on specific additional requirements from the other framework rather than fully complying with both complete systems in parallel.
• Design controls from the device framework are a commonly required addition when drug cGMP is chosen as the primary system, since drug cGMP alone does not otherwise address device-style design control expectations relevant to the device constituent part.

What FDA inspectors look for

• Whether the manufacturer has correctly identified and documented which cGMP framework serves as primary and which specific additional requirements from the other framework are being applied under the streamlined approach.
• Whether device-specific expectations, such as design controls, are genuinely addressed when drug cGMP is the chosen primary framework, not overlooked because the product is being managed primarily as a drug.
• Whether the constituent parts' individual quality attributes, drug stability and device functional performance, are both genuinely assured, not just the more familiar constituent part to the manufacturer's usual regulatory experience.

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