Walgreen (WAG), one of the largest retail pharmacy chains in the US, has decided to sell its pharmacy benefit management (PBM) business to Catalyst Health (CHSI) for $525 million in cash. The transaction, expected to close by the end of June 2011, is subject to regulatory clearances. Walgreen anticipates the deal to be EPS-neutral in [...] (WAG) Walgreen Announces Sale of Pharmacy Benefit Management Business