IntroductionAfter many years of study clofibrate, the first of the fibrates, seemed in the 1960s, to be an effective means of lowering raised plasma cholesterol. It provided an opportunity for examining the key question of whether reduction of plasma cholesterol might lead to reduction in the incidence of coronary heart disease (CHD). While small secondary prevention trials looked promising, a large primary prevention trial (the WHO trial) carried out over 5.3 years on 15 745 men aged 30-59 years provided contradictory results with reduction in nonfatal myocardial infarction, less hypertension, no change in coronary mortality but an increase in non-cardiovascular mortality. Clofibrate also increased gall stone formation and the need for cholecystectomies. Clofibrate was not an appropriate drug to recommend for population control of CHD. It did, however, usher in other fibrates and foreshadowed successful statin trials.