(AP Photo/Charles Krupa)

Shares of Walgreens Boots Alliance plunged Tuesday after it reported weaker-than-expected quarterly earnings, slashing its 2019 forecast after what CEO Stefano Pessina called the “most difficult quarter.”

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The nation’s largest drugstore chain now expects full-year earnings for 2019 to be roughly flat — compared to its previous guidance of 7 percent to 12 percent growth. Walgreens also said it plans to cut costs by more than $1.5 billion by 2022, instead of its originally anticipated $1 billion.

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