Oh, no - competition! Wikipedia:

Dart Drug is a now-defunct chain of discount drug stores in the metropolitan Washington, DC region. It was founded in 1955, by Herbert Haft and his wife Gloria in Adams Morgan. The chain expanded to over 100 stores, and became a vehicle (as Dart Group) by which Herbert Haft engaged in greenmail activities against other public companies. It spun off Trak Auto and Crown Books. Dart Drug was sold to a management group in 1984, bought by Bud Fantle in 1987 and renamed Fantle's, entered bankruptcy in 1989, and was eventually dissolved in 1990.

Toss in a bitter family struggle over the fortunes as its founder declined, too.

I used to live in Adams Morgan; I wonder if the first Dart was the People's Drug, but that chain predated Dart.