Veritasium

How This Miracle Drug Disappeared Over Night

In 1996, a drug called ritonavir was introduced to treat HIV, rapidly becoming a miracle for patients. By 1998, 75,000 patients were taking up to 20 pills daily, transforming a fatal condition into a manageable one. Each batch of ritonavir capsules underwent rigorous quality control, including dissolution tests to ensure they dissolved within 30 minutes for proper absorption. For two years and 240 consecutive lots, the drug never failed. However, an analyst discovered a capsule that did not dissolve properly, triggering an emergency shutdown. The entire batch was destroyed, and the production line was deep-cleaned to eliminate contamination. The next day, the same issue recurred: clear capsules turned white and cloudy. Technicians found the paste filled with millions of tiny, needle-like crystals, previously unseen. Attempts to recreate ritonavir in the lab also yielded cloudy, white paste, baffling researchers. Despite checking all ingredients, settings, temperatures, and procedures, everything appeared correct. Within a week, all ritonavir produced by both the lab and factory became cloudy.