On drug instructions, words such as "use with caution, avoid use, ban" often appear, although it is just a word difference, the meaning is different.

　　Caution when the use of drugs in the "careful use" range, the use of drugs to be careful, that is, in the use of drugs to pay attention to the observation, such as the occurrence of adverse reactions immediately stop the drug. What need careful use normally is to point to children, old person, pregnant woman and the patient with bad heart, liver, kidney function. Such as aspirin drugs to gastric irritation, patients with ulcer disease should be careful to use; Gentamicin should be used with caution in patients with renal insufficiency. Chinese patent medicine tianma pill, liushen pill and other drugs for pregnant women should be carefully used. Generally speaking, when the family encounters caution to use medicaments, after answering to consult a doctor, use had better.

　　Avoid to use "avoid to use" often with "disable" distinction hard. "Avoid to use" have the meaning that avoids to use, say colloquially, had better not use namely. Some patients taking this kind of medicine may bring obvious adverse reactions and adverse consequences, but there are individual differences, which cannot be generalized. Avoid using drugs as much as possible. If it is "avoid" drugs, but the condition and urgent need to do? It can be replaced by a drug with similar effect but less adverse reaction. It must be used, or it can be used in combination with other drugs to combat its side effects. It is safer.

　　Disable is to do not have the leeway of any optional, belong to put an end to, prohibit to use. Such drugs should not be used, once the misuse of serious adverse reactions or poisoning. If penicillin is allergic to penicillin, it should be banned; Morphine has respiratory inhibitory effect and is contraindicated in patients with persistent bronchial asthma or heart disease. Chinese patent medicine niuhuang jiedu pill, guanxinsuhe pill and other drugs are forbidden for pregnant women. The toxic and side effects of these drugs will be harmful to such people, even life-threatening, so it is forbidden.