What is continuous manufacturing for biologics and what are its advantages?

Continuous manufacturing runs processes without interruption, as opposed to traditional batch processing. Implementation in biologics: 1) Upstream - perfusion bioreactors maintain steady-state culture with continuous harvest; ATF or TFF for cell retention. 2) Downstream - integrated continuous chromatography (multi-column, periodic counter-current), in-line virus inactivation, continuous filtration, real-time blending. Advantages: smaller equipment footprint (5-10x smaller), reduced capital costs, consistent product quality (steady-state operation), real-time process monitoring and control, faster processing (no hold times), flexible production scale (by run time), and reduced material loss. Challenges: complex process control, need for robust analytics (PAT), regulatory framework still evolving, validation requirements, and change management. FDA supports continuous manufacturing with guidance documents. Adopted more in small molecules; biologics implementation growing.