CVS Caremark Corp., the largest provider of prescription drugs in the U.S., agreed to buy Coram LLC from Apria Healthcare Group Inc. for about $2.1 billion to add specialty infusion services, its biggest deal in five years.

The acquisition won’t have a material impact on 2014 results and will add adjusted earnings of as much as 5 cents a share in 2015, Woonsocket, Rhode Island-based CVS said today in a statement. CVS said the unit will have about $1.4 billion in revenue in the first 12 months after the deal closes.

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