By the time sales figures for August are tallied, last week's Hurricane Irene may have flooded more than the East Coast seaboard; she may have flooded pharmacy registers, too.

Walgreens on Wednesday reported July sales of $5.82 billion, an increase of 4.7%.

Walgreens’ stock was trading up 30 cents to $43.03 on the New York Stock Exchange mid-morning on Wednesday thanks to favorable same-store sales growth of 4.8% for the month of June versus an analyst consensus estimate of 2.8%.

Credit Suisse on Wednesday initiated coverage of General Nutrition Centers, the specialty retailer of supplement and nutritional products and partner with Rite Aid in a store-within-a-store program across more than 1,000 drug store locations.

Supervalu on Thursday reported better-than-expected results with an earnings per share of 44 cents, which was 10 cents above analyst consensus of 34 cents.

Following the recent sale of Walgreens' pharmacy benefit management business, Credit Suisse analysts said they are interested in the executive team's updated thinking on their healthcare strategy and plans for the $550 million in proceeds.

The flu may drive consumers to bed, but drug store sales are expected to benefit from an increase in flu activity, according to a Credit Suisse research note.

Rite Aid brought the New Year in with a bang, recording monthly same-store sales increases across both the front end and back bench for the first time in almost two years.