Mylan's unusual decision to introduce an identical, generic EpiPen competitor follows a week of pressure to lower the price of its lifesaving allergy drug — but some are now questioning whether the move, designed to appear as a price-lowering measure, may in fact net Mylan more revenue than the original version.

The generic version of EpiPen will have a list price of $300 for a two-pack, about half that of the branded EpiPen, Mylan said Monday. It'll be "AB-rated," meaning pharmacists can automatically swap in the generic version for the brand.