Don't stop taking a medication if you experience an unpleasant reaction

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Talk to your doctor first. The benefits of the drug may far outweigh any side effects.

Unpleasant or harmful reactions to medications are common and can range from mild—a little nausea, 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.

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