IT wasn’t funny, really, but everybody laughed at the scene in the 1979 film “Starting Over” when Burt Reynolds’s character had a panic attack in the furniture department of Bloomingdale’s (something to do with terror at the prospect of buying a couch). “Does anyone have a Valium?” his brother called out as Burt hyperventilated. The punch line: Every woman in the store reached into her purse and pulled out a little vial of pills.

Nor was it surprising that all those Bloomie’s shoppers could be so helpful, since by that time Valium, which had been introduced in 1963, was the best-selling prescription drug in America, with billions of blue or yellow or white pills, each stamped with a trademark V, sold every year.

Valium was, significantly, one of the first psychoactive drugs to be used on a large scale on people who were basically fine. It has since been surpassed by other drugs, like the popular tranquilizer Xanax. But with the pharmaceutical giant Roche announcing that it will soon close the Nutley, N.J., plant where Valium and its predecessor, Librium, were developed, it’s a good time to remember how revolutionary these “minor tranquilizers” were half a century ago. These were the drugs that gave us a new way to slay our inner demons, medicating our way to a happier life.

How did Roche convince physicians that it was O.K. to offer their patients a bottled form of serenity? How did the physicians persuade their patients? And how did the company’s success in this venture shape our collective attitudes toward normal versus abnormal, stoic versus foolhardy, and the various ways available to cope with the ups and downs of daily life?