Surely jarred by the news images of massive flooding across the Texas Gulf Coast region, Walgreens customers are responding with a growing stream of donations to the American Red Cross relief effort for Hurricane Harvey.

Just a day after announcing the donation program at Walgreens and Duane Reade store checkouts on Tuesday, the company reported $1 million contributed. That total topped $3 million 24 hours later.

A Walgreens spokesman reported that as of Friday afternoon, $5 million had been contributed from checkout donations.

The company also made a $200,000 donation to the American Red Cross to aid in recovery from the devastating storm.

The spokesman said Walgreens has approximately 450 stores open in southeast Texas and Louisiana. About 50 locations are currently closed.

In addition, Walgreens has deployed pharmacy services in Houston’s George R. Brown Convention Center to assist evacuees with prescription needs. The drug chain also has donated food items, first aid products and medical equipment — including blood pressure cuffs, glucometer strips and transport wheelchairs — to aid the relief efforts at the convention center.