Paul S. Forbes, one of three dozen executives of Drug Fair Inc. who were dismissed suddenly when the retailer was acquired recently by Gray Drugs of Cleveland, has established his own communications consulting business.

Forbes helped develop most of the key consumer and community activities at Giant Food Inc. as executive assistant to the late Joseph Danzansky, who was president of the food chain. Forbes worked for Giant from 1952 to 1977, when he moved to Drug Fair to develop similar programs.

From his home in Fairfax, Forbes already has signed up clients for communications and community program consulting work. He said he had been interested in setting up his own shop for some time and that developments at Drug Fair since Gray took over offered him the opportunity to move in a new direction.

At Drug Fair, Forbes was vice president of communications and public affairs, responsible for inside and external communications, government and consumer relations and trade activities. He developed a health-care public information program and started the acclaimed "straight talk on drugs" program, through which the chain used advertising to inform the public about troubles with narcotics.

At Giant, he recruited Esther Peterson as consumer adviser to the company and proposed and organized a quality assurance laboratory program to monitor goods sold by the food chain. He is former president of the Mid-Atlantic Food Council and a director of numerous national or regional retail and business groups. Forbes also played a major role in developing food resources for city residents during and after the D.C. riots of 1968.