Many families are equipped with a small medicine box, but there are many misconceptions in the use of antibacterial drugs, the common ones are as follows: 1, the more expensive the better, in fact, drugs are not “cheap goods, good goods are not cheap” ordinary goods, as long as they are used properly, a few cents of drugs can also achieve the efficacy of the medicine to the disease; 2, random abuse at present Common, such as many people with antibacterial drugs for colds, although antibacterial drugs can anti-bacterial and certain microorganisms, but not anti-viral, and most of the colds are viral infections, random use will only increase the side effects, so that bacteria resistance; 3, in addition, many people after the disease, heavy fashion can take drugs on time and in accordance with the amount, once the disease remission, take drugs at will. It is important to know that the efficacy of antibacterial drugs depends on the effective blood concentration, such as failure to achieve effective blood concentration, not only can not completely kill the bacteria, but will make the bacteria resistant; 4, for the disease is indeed a bacterial infection, according to the different strains of bacteria causing the disease to choose the appropriate drugs; 5, some people think that as long as the antibacterial drugs can be anti-inflammatory, and even to make the disease healed at the same time use several antibacterial drugs. The antibacterial spectrum of each antibacterial drug is different, and improper use of drugs, the light will not achieve the desired efficacy or reduce the effectiveness of drugs, or increase the toxic side effects of drugs, endangering health.