The 1,872 cans were sent to food chain Lidl in southern Sweden, and contained Xide Citrus Fizz, a ready-mix alcopop party drink with 4.5 percent alcohol content.
"We apologize for what happened and any discomfort it caused," Henric Byström, spokesman at Carlsberg Sweden, said in a statement.
"We take it very seriously and have launched an internal investigation."
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Carlsberg added that it would be tough to drink the party drink by mistake, and that the Citrus Fizz was a much lighter colour.