If slow heartbeats (bradycardias) don't have a cause that can be corrected - such as low thyroid hormone levels or a drug side effect - doctors often treat them with a pacemaker.

如果导致心动过缓的病因无法矫正——比如甲减、或某些药物的副作用——起搏器常常是最佳的选择。

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Sometimes when you take a common drug, you may have a side effect.

有时当你服用一种普通药物时，可能会有副作用。

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A side effect is basically an unintended occurrence that results from taking a drug. Side effects can be good or bad, depending on how you use the drug.

对于一种药物，副作用基本上是一个意想不到的出现，副作用的好坏取决于你怎么使用这个药物。

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Merck not only caught up by skipping a stage of trials (a risky move that often backfires), but its Januvia pill emerged with the entire market for the class when the Novartis drug ran into side effect problems at the FDA and was never approved.

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The case illustrates the difficulty of pinning a side effect to a particular drug based on the scant reports of side effects that come to the FDA. It is extremely difficult to link a side effect, like an inflamed pancreas, with a particular drug.

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At best, it signals broad trends or prompts action if there is a proven or at least a strong correlation between the drug and a suspected side effect.

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