3 ms·

The 0.3 mg of epinephrine injected by the pen probably isn't patented, but I believe that the pen is.

• maxerickson 10y ago
  Various improvements to the pen have been patented over the years, the initial patent was granted in 1977 and is expired. The question becomes, how small an improvement should we look at and decide that it warrants exclusivity? It's a trickier question for something like the Epipen where there is benefit from widespread understanding of how to properly use it (so a change to the pen that requires different user training becomes a change that removes generics from the market).