The effect of natural, butyl and coated butyl elastomeric closures on stability of cefazolin sodium, cefradine, benzylpenicillin potassium and ampicillin sodium for injection was investgated.

• 考察了分别用天然胶塞、丁基胶塞和复膜丁基胶塞包装的头孢唑啉钠、头孢拉定等4种注射用抗生素的质量稳定性。