Walgreens will close about 1,200 locations over the next three years as the drugstore chain seeks to turn around a struggling U.S. business that contributed to a $3 billion quarterly loss.

Walgreens signaled that more store closings are on the way, missed earnings expectations for its third quarter and cut its annual forecast.

Walgreens and a Google affiliate are testing drone deliveries that can put drugstore products on customer doorsteps minutes after being ordered.