[Economic impact of adverse drug effects. Some reflections].

The cost of adverse drug effects first began to be analyzed in the 1960s, with an evaluation of related admissions to hospital in the USA. The average cost per patient of adverse events requiring hospitalization in France was estimated at 6,250 F in neurology units in 1979/1980, and 14,920 F in geriatric units in 1984. Fifty per cent of these events were avoidable. A second approach is to measure the cost of certain iatrogenic manifestations, e.g. fever due to fipexide, stenosis and perforation of the small intestine due to potassium chloride, gastrointestinal bleeding due to NSAIDs, kidney damage due to aminosides, etc. Calculations of the economic impact of adverse drug effects must also take into account indirect costs such as loss of productivity. The lack of such studies should not make health care specialists forget the magnitude of the problem.