About 1/3rd of the people dropped out of the FDA trial before it was complete. Afrezza was a turd, that you couldn't giveaway, long before Sanofi was involved.
Some people think under 18 use is Afrezza's niche. Only two people signed up for the pediatric trial. Only two people in the USA, under 18, were willing to deal with using Afrezza for FREE.
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