This article stated that Caduet is covered by three US patents US 4,681,893 (which covers atorvastatin calcium); 5,273,995 (which covers amlodipine besylate); and 6,455,574 (which covers the product). In fact, both the '893 and the '995 patents relate to atorvastatin calcium.
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The online version of the original article can be found at 10.1038/nrd2516
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Harrison, C. Erratum: Ranbaxy loses in Caduet dispute. Nat Rev Drug Discov 7, 458 (2008). https://doi.org/10.1038/nrd2569
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DOI: https://doi.org/10.1038/nrd2569