一、品种动态:抗生素在医学临床上是一类不可缺少的药物。八十年代初世界上生产的抗生素达10万吨以上,主要资本主义国家生产的医用抗生素约25,000吨,其中青霉素类7,000吨,头孢菌素类1,200吨,四环素5,000吨,红霉素800吨,其中β—内酰胺类抗生素占总产量的72.8%,而且还在逐年增长。根据预测β—内酰胺类抗生素在八十年代到 First, the species dynamics: antibiotics in clinical medicine is an indispensable class of drugs. In the early 1980s, antibiotics produced in the world amounted to more than 100,000 tons. The major capitalist countries produced about 25,000 tons of medical antibiotics, of which 7,000 tons were penicillins, 1,200 tons for cephalosporins, 5,000 tons for tetracycline, 800 tons for erythromycin, The β-lactam antibiotics accounted for 72.8% of the total output, but also increased year by year. According to the forecast β-lactam antibiotics in the eighties to