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Anemia associated with ACE inhibitors is rare but it may cause problems especially in patients with renal disease. This study assessed the acute effect of trandolapril, an ACE inhibitor, on serum erythropoietin (EPO) levels in uremic and hypertensive patients. Trandolapril 2 mg/day was given orally for three days and blood samples were collected on the first and third day. Trandolapril led to a significant decrease in serum EPO in patients with chronic renal failure. Although the drug lowered serum EPO in hypertensive patients, this effect was not statistically significant. This drop in serum EPO levels may be one of the mechanisms by which ACE inhibitors cause anemia, or worsen anemia, in uremic patients and further studies are needed to clarify this point.