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一、利福平它是常用的抗结核药，能使口服避孕药的主要成分炔诺酮和炔雌醇的代谢加快，降低血液中的药浓度，还有可能使子宫内膜部分脱落而出现点滴出血或淋沥不尽，同时使避孕药效降低而导致避孕失败． 二、抗菌素有人曾对３８名服用避孕药同时用氨苄青霉素、新霉素、四环素、
First, rifampicin It is commonly used anti-TB drugs, oral contraceptives can make the main component of norethindrone and ethinyl estradiol to speed up the metabolism, reduce the blood concentration of the drug, there may be part of the endometrium off Dripping bleeding or pour leaching endless, while reducing the contraceptive efficacy lead to contraceptive failure. Second, some people have antibiotics 38 contraceptives taking ampicillin, neomycin, tetracycline,