WASHINGTON, June 22 (Reuters) - The states of California, New York, Illinois, Minnesota, Washington and Wisconsin have joined a Federal Trade Commission (FTC) lawsuit to stop Amgen's (AMGN.O) $27.8 billion deal to buy Horizon Therapeutics (HZNP.O), according to a court filing on Thursday.
Washington Attorney General Bob Ferguson said his state had joined the lawsuit because "monopolies harm consumers" and the merger could allow Amgen to "dominate" prescription drug markets.
The FTC acquisition marks a change for the agency, which previously had typically flagged therapeutic overlaps in companies and waved deals through after requiring one of the medicines to be divested.
Amgen said in a statement last month it was disappointed by the FTC decision and it believed it had "overwhelmingly demonstrated" that the deal had no legitimate competitive issues.
The last major pharmaceutical deal approved by the FTC was AstraZeneca's (AZN.L) $39 billion acquisition of Alexion Pharma in April 2021, about two months before FTC Chair Lina Khan was appointed by the Biden administration.
Persons:
Bob Ferguson, Rob Bonta, Amgen, Lina Khan, Biden, David Shepardson, Jamie Freed
Organizations:
Federal Trade Commission, Horizon Therapeutics, . Washington, FTC, Horizon, Alexion Pharma, Thomson
Locations:
California , New York , Illinois, Minnesota, Washington, Wisconsin, California