Walgreen Tuesday said October sales at stores open a least a year rose 2 percent, slightly less than the preliminary rise of 2.2 percent it reported last week, before the month had ended.
Pharmacy same-store sales rose 2.8 percent.
The company said generic drug introductions in the past year cut its pharmacy same-store sales by 2.2 percentage points. Generic drugs cost less, lowering sales figures, but are more profitable for drugstores.
The number of prescriptions filled at Walgreen stores open at least a year decreased 0.4 percent, hurt by the switch of Zyrtec allergy medication from a prescription drug to one that is sold over the counter.
Same-store sales of general merchandise, or sales in the front end of the stores, increased 0.4 percent.
Last week, Walgreen said same-store sales rose 2.2 percent through Oct. 28, with pharmacy same-store sales up 3.4 percent in that period, while front-end same-store sales were flat.