(Bloomberg) — CVS Health Corp. dropped Pfizer Inc.'s erectile dysfunction medication Viagra from its list of coverage for drug insurance benefits, two years before the treatment is expected to face generic competition.

Patients can get coverage for Eli Lilly & Co.'s Cialis instead, CVS said in a document detailing the drugs it's removing from the list, called a formulary, starting Jan. 1.

While CVS got its start as a discount retail chain, it's become increasingly influential in the drug business, acquiring Caremark in 2007 to become the second-biggest manager of pharmaceutical benefits on behalf of U.S. insurers and employers.

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