CAMP HILL, Pa.--(BUSINESS WIRE)--Rite Aid Corporation (NYSE: RAD) today announced sales results for May. Monthly Sales For the five weeks ended May 30, 2015, same store sales increased 2.1 percent over the prior-year period. May front-end same store sales increased 0.1 percent. Pharmacy same store sales, which included an approximate 179 basis points negative impact from new generic introductions, increased 3.0 percent. Prescription count at comparable stores increased 0.7 percent over the prio