I don't know why there weren't more competitors. Apparently part of it is that it is difficult to get right. Adrenaclick generics have been on the market much of that time for $150 or less.

One thing though, they would be epinephrine auto injectors, not Epipens, that's one of the things the patent did, it made it so that a prescription for Epipen could only be filled with Mylan's product.