The Disappearing Polymorph: How Ritonavir Production Was Disrupted

This video explores how an unexpected crystal form change in the HIV drug ritonavir disrupted manufacturing in the late 1990s and explains the science of polymorphism behind it. It connects the case to historical chemistry disputes and familiar examples to show why a molecule's solid form can determine its behavior.

■ The ritonavir crisis and disappearing polymorph
- Quality-control failures and the appearance of needle-like crystals in capsules
- Spread of the new crystal form from a Chicago facility to an Italian production site
- Identification of a more stable polymorph, Form II

■ Scientific context and broader implications
- Historical dispute over isomers and the use of spectroscopy to distinguish structures
- Chocolate tempering and tin pest as examples of how crystal packing changes properties
- Pharmaceutical response through a liquid formulation and industry-wide polymorph screening

For viewers interested in chemistry, drug development, or materials science, the video provides an overview of why crystal forms matter in medicine and how a manufacturing process can be affected by a more stable polymorph. It outlines the challenges of detecting, controlling, and preventing such transformations.