四环素为广谱抗生素类药物,因其抗菌谱广,且口服方便,所以临床应用较广泛。但四环素的副作用较大,主要是影响小儿骨、牙的生长,小儿即使在很短时间内使用,亦可引起乳、恒牙着色,釉质发育不良。孕妇(四个月以上)使用后,出生的幼儿乳牙可 Tetracycline is a broad-spectrum antibiotics, because of its broad antibacterial spectrum, and oral convenience, so the clinical application is more extensive. But tetracycline side effects larger, mainly affects the growth of pediatric bone, teeth, even in a very short period of time children can also cause milk, permanent teeth coloring, enamel dysplasia. Pregnant women (more than four months) after use, born baby teeth can be