Alcon received a subpoena from the U.S. Department of Health and Human Services on September 23 requesting the production of documents relating to marketing practices, as well as the remuneration of healthcare providers.
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The case involves the Alcon products Vigamox, Nevanac, Omnipred and Econopred, as well as surgical equipment.
Novartis revealed the case in a footnote to its third-quarter results and said Alcon was cooperating with the civil investigation.
(Reporting by Ben Hirschler. Editing by Jane Merriman)