题目：
Dosage (剂量): Adults sixteen years old and over take three tablets as needed, not to exceed twelve tablets per day. Children seven years old to sixteen years old take half the adult dosage, not to exceed six tablets per day.
Warning: Do not take more than the recommended dosage unless directed by a physician. Do not give to children under seven years old, or to individuals with stomach disorder, heart disease or high blood pressure. This preparation may cause headaches and drowsiness (昏昏欲睡). Do not operate machinery while taking this medication. If relief does not occur within five days, discontinue the use and consult your physician, for chronic (长期的) cough can be dangerous.
According to the direction, what is the side effects (副作用) of this medicine
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
