Questions 23 to 25 are based on the recording you have just heard.

Recording Three

    Sometimes when you take a common drug, you may have a side effect. That is, the drug may cause some effect other than its intended one. When these side effects occur, they are called adverse reactions. （23）Whenever you have an adverse reaction, you should stop taking the drug right away. Ask your pharmacist whether he can suggest a drug that will relieve the symptoms but that will not cause the adverse reaction. If an adverse reaction to a drug is serious, consult your doctor for advice at once. Drugs that are safe in the dosage stated on the label may be very dangerous in large doses. For example, aspirin is seldom thought of as dangerous, but there are many reports of accidental poisoning of young children who take too many aspirin pills, as well as the possible development of Reye’s syndrome of children with flu. In adults, excessive use of some pain-killing drugs may cause severe kidney （肾脏） damage. Some drugs for relief of stomach upsets, when taken in excess, can perhaps cause serious digestive problems. You should never use any over-the-counter drug on a regular, continued basis, or in large quantities, except on your doctor’s advice. You could be suffering from a serious illness that needs a doctor’s care. Each drug you take not only acts on the body but may also alter the effect of any other drug you are taking. Sometimes this can cause dangerous or even fatal reactions. For example, aspirin increases the blood-thinning effect of drugs given to patients with heart disease. Therefore, a patient who has been taking such a drug may risk bleeding if he or she uses aspirin for a headache. Before using several drugs together you should ask your doctor and follow his advice. Your pharmacist can tell you whether certain drugs can safely be taken together. （24）Alcohol may increase the effect of a drug—sleeping pills combine with alcohol to produce a sleepy feeling. When taking any drug, you should ask your doctor whether drinking alcohol could be dangerous in combination with the medicine. Experts believe there is a relationship between adult abuse of legitimate medicines and the drug culture that has swept our country. （25）You can do your share to reduce the chances that your children will become part of the drug culture by treating all medicines with respect. Always let your children know that medicines and drugs should not be used carelessly.

23. What does the speaker say you should do when you have an adverse reaction?

解析：B。问题为：是当你有不良反应时，讲话者说你应该做什么？录音开头直接提到当你有不良反应时，你应该立即停止服药，因此B选项正确。