More than 400 people say they've had problems filling EpiPen prescriptions.
They've either had to wait for weeks, or have been unable to obtain the pens at all.
Mylan distributes and is the rights holder of EpiPen.
They say they're aware of the problems, but don't want to call it a shortage just yet.
Mylan blames their manufacturer, Pfizer's Meridian Medical, for the slowdown.
The FDA thinks otherwise. They've added generic EpiPens to its drug shortage list.