磺胺药是防治传染病的常用药,它对多数球菌、某些固紫染色阴性杆菌有抑制作用,对有的原虫以及过去称为大型病毒的微生物(如沙眼衣原体)也有作用。近年来,又陆续合成了一些长效、高效而毒性低、副作用小的新磺胺,还发现了增效剂,使用 Sulfa drugs are commonly used in the prevention and treatment of infectious diseases. They inhibit most cocci and some solid-violet-negative bacilli, and also play a role in protozoa and microorganisms such as Chlamydia trachomatis, which were formerly known as large viruses. In recent years, they have also synthesized a number of long-term, high efficiency and low toxicity, side effects of small sulfonamides, also found synergist, the use of