Where do chain stores get their generics from?

[Aznfarmerboi]

CVS, Duane Reade, Rite Aid, Eckereds, Walgreens, etc all have their generic otc products such as acetaminophen, ibuprofen, aspirin, etc. The question is where do they get it from? I know they dont manufacture it.

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[npage148]

perrigo

 

[Abilify]

They all have contracts with different generic mfg's. It's just like store brand mac & cheese versus Kraft Macaroni and Cheese