Walgreen (NASDAQ:WBA) saw its May results flower. For the month, the company's sales were $6.22 billion, a rise of more than 4% from the $5.97 billion the company posted in May of last year. Overall front-end (i.e., non-pharmacy goods) sales also rose on an annual basis, by 3.4%, while pharmacy sales grew at a rate of 4.4%.

Comparable-store sales advanced 2.8% during the month when matched against those of May 2012. Front-end comps edged up by 1.2% over that time frame. Comparable pharmacy sales grew by 3.8% over May 2012's figure. Customer traffic on a comparable-store basis, however, recorded a 3.5% decline.

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