PITTSBURGH - A federal judge in Pennsylvania on April 25 ruled that pharmacies and pharmacy trade groups challenging the consummated $29 billion merger of pharmaceutical benefit management companies Express Scripts Inc. (ESI) and Medco Health Solutions Inc. were not entitled to a preliminary injunction because they failed to establish the likelihood of immediate, irreparable harm that could be alleviated by the issuance of a preliminary injunction (National Association of Chain Drug Stores, et al. v. Express Scripts, Inc., et al., No. 2:12-cv-00395-CB, W.D. Pa.; 2012 U.S. Dist. LEXIS 57884).