Unpleasant or harmful reactions to medications are common and can range from mild—a little nausea or diarrhea, for example—to severe—such as fainting or palpitations. Such reactions cause some people to abruptly stop taking the medication without telling their doctor. This can make them feel better, but it may also create a problem—for example, seriously elevated blood pressure or heart rate. A better approach is to talk with a health-care provider first. He or she may be able to find a different medication, or offer ways to minimize symptoms.
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