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  1. en.wikipedia.org › wiki › DrugDrug - Wikipedia

    In pharmacology, a drug is a chemical substance, typically of known structure, which, when administered to a living organism, produces a biological effect. [3] A pharmaceutical drug, also called a medication or medicine, is a chemical substance used to treat, cure, prevent, or diagnose a disease or to promote well-being. [1]

  2. en.wikipedia.org › wiki › WalgreensWalgreens - Wikipedia

    Walgreens is an American company that operates the second-largest pharmacy store chain in the United States, behind CVS Health.[3] It specializes in filling prescriptions, health and wellness products, health information, and photo services.[4] It was founded in Chicago in 1901, and is headquartered in the Chicago suburb of Deerfield, Illinois ...

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