NEW YORK (TheStreet) -- Prescription drug sales helped Walgreen (WAG) posted its best quarterly sales figures in three years. Fiscal fourth-quarter earnings came in at 74 cents per share, in line with analyst forecasts.

The acquisition of the Alliance Boots chain in Europe added about 6 cents to the bottom line in the latest quarter.

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On the top line, the drugstore chain posted revenue of $19.06 billion in the fourth quarter, slightly better than Wall Street estimates. The country's biggest drug retailer said it filled 211 million prescriptions in the quarter, that was up a little more than 4% from a year ago.

Walgreen says it saw strong growth in the number of prescriptions it filled for Medicare Part D patients. Walgreen shares are up roughly 9% over the past year, and up 4% since the beginning of 2014, that's compared to the Standard & Poor's 500 index which is up 7% for the same period. 

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