“Much doubt persists about the different benefits from, and indications for, all the many drugs proposed for the relief of anxiety” (Lancet, 1965). Chlordiazepoxide is one of the most popular minor tranquillizers used by psychiatrists, physicians and general practitioners. Its efficacy has been advocated in the “Today's Drugs” column of the British Medical Journal (1967, 1968a and b). Others, however, have been “impressed by the number of patients who claim great benefit but show little evidence of this” (Jenner, 1965).