Walgreens is set to close a substantial number of its roughly 8,600 locations across the United States as the company looks to reset the struggling pharmaceutical chain’s business.

The company didn’t announce a specific number of store closures, but it said Thursday that it is planning “significant” closures of underperforming stores across America as part of a multiyear optimization program.

CEO Tim Wentworth said on a call with analysts Thursday that “changes are imminent” for the roughly 25% of stores that aren’t profitable and Walgreens’ strategic review will “include the closure of a significant portion of these underperforming stores.”

“We are at a point where the current pharmacy model is not sustainable and the challenges in our operating environment require we approach the market differently,” he said.

In an interview with the Wall Street Journal Thursday, Wentworth said the closures would focus on locations that aren’t profitable, too close to each other or stores struggling with theft.

Walgreens revealed few additional details about the closures on the call, but said they would take place over the next three years. The company also said it will consider additional closures if performance doesn’t improve. The “vast majority” of employees working at affected stores will be offered jobs elsewhere, Wentworth said.

Walgreens’ (WBA) shares fell 20% to its lowest level in decades. The company also said in its earnings statement that it has slashed its full-year profit outlook.

“We continue to face a difficult operating environment, including persistent pressures on the US consumer and the impact of recent marketplace dynamics which have eroded pharmacy margins,” Wentworth said in a press release. “Our results and outlook reflect these headwinds.”

Ihttps://edition.cnn.com/2024/06/27/business/walgreens-closures?cid=ios_app