单项选择题

Questions 26-30 are based on the following passage:

Medicine Directions I 　　Take two tablets with warm water, followed by one tablet every eight hours, as required. For maximum nighttime and early morning relief, take two tablets at bedtime. Do not exceed six tablets in twenty-four hours. 　　For children six to twelve years old, give half the adult dosage. For children under six years old consult your doctor. 　　Reduce dosage if nervousness, restlessness, or sleeplessness occurs.

Clearly the medicine______.