By Tess Stynes 

Walgreen Co. reported its sales at existing locations rose a better-than-expected 4.5% in November, led by growth in its pharmacy business.

Analysts polled by Thomson Reuters expected an increase of 3.8%.

Walgreen said pharmacy sales improved 6.7%, exceeding analysts' estimate for an increase of 5.3%. Prescriptions filled rose 2.6%. A calendar shift had a negative impact of two percentage points and generic drug introductions over the past year had a negative impact of 1.9 percentage points.

Pharmacy sales represented 65.2% of total sales during November.

In the front of the store, sales edged up 0.8%, below analysts' projections of 1.2% during the month, as customer traffic declined 3.3%, mostly offsetting an increase in basket size of 4.1%.

Total drugstore sales rose 4.9% to $6.36 billion for the month.

For the three-month period ended Nov. 30, the drugstore chain operator reported total sales rose 6.8% to $19.59 billion, above analysts' estimates for $19.34 billion. Sales, excluding newly opened or closed locations, improved 5.8%, including growth of 1.5% in the front of the store and 8.3% in the pharmacy section.

The company has been under pressure owing to a miscalculation in the pricing of generic prescription drugs. Walgreen also has been taking steps to achieve $1 billion in costs savings by the end of fiscal 2017 and to complete its deal to buy the rest of European drugstore company Alliance Boots GmbH.

Write to Tess Stynes at tess.stynes@wsj.com

Access Investor Kit for Walgreen Co.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US9314221097

Subscribe to WSJ: http://online.wsj.com?mod=djnwires