Disclosed are co-electrospun polymeric fibers comprising polymers comprising pharmaceutically active agents and/or biologically active agents and capable of release at a combined release rate. Also disclosed are processes for preparing polymeric fibers capable of release at a combined release rate. Also disclosed are processes of modulating delivery rate of pharmaceutically active agents and/or biologically active agents. Also disclosed are processes of delivering pharmaceutically active agents and/or biologically active agents. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.