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New York: Half of all heart patients made at least one medication-related mistake after leaving the hospital, and guidance from a pharmacist didn't seem to reduce those errors, in a new study. Consequences of mistakes - such as forgetting to take certain drugs or taking the wrong dose - can range from side effect like constipation to more serious drops in blood pressure. Two percents of errors were life-threatening. Not all of problems, however, were the fault of patients. Some may have resulted from medication side effects or other factors beyond the patients' control. Hospitals involved in the study were already taking steps to prevent medication mistakes in addition to the extra pharmacist intervention, said Dr. Sunil Kripalani, the study's lead author from the Vanderbilt University Medical Centre in Nashville, Tennessee. "We were surprised to see that in spite of these efforts, that 50 percent (of patients) were still having these medication errors," he told Reuters health. Although the pharmacist visits didn't help the average patient, he added, certain ones seemed to benefit - such as patients who were on multiple drugs or had trouble understanding health information. As for traditionally lower-risk patients, he said othe strategies to prevent errors may be needed - Reuters What is the effect of medication errors?