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Adverse reactions to medications are much more likely to occur and to be serious in older people than in the young, the American Family Physician reports. In several studies of elderly people, an adverse reaction was found to be the cause of admission to the hospital in 25 to 40 percent of cases.

The reasons for this common problem are various, and one cannot single out anything that applies to them all. Nevertheless, many drugs can cause nutritional depletion by interfering with the absorption of food and the sense of taste. This, in turn can lead to a deficiency of vitamin C, which makes such people much more prone to stomach injury by aspirin and anti arthritis drugs, with gastric ulcer and internal bleeding as the result
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