CAMP HILL, Pa. — Rite Aid on Thursday posted a 1.5% increase in same-store sales for the five weeks ended March 1. February front-end same-store sales decreased 1.8%, of which 0.5% was attributable to a decrease in sales of flu-related over-the-counter products. Pharmacy same-store sales, which included an approximate 138 basis points negative impact from new generic introductions, increased 3.1%.