Emergency contraceptive pills can be eaten with vitamin C, vitamin C is acidic, generally do not and alkaline drugs taken together, so as not to produce acid-base neutralization reaction affecting the effect of the drug, the metabolism of emergency contraceptive drugs mainly by the greater impact of alcohol, so when taking drugs should avoid drinking alcohol, so as not to affect the metabolism of the drug, resulting in contraceptive failure. Taking vitamin C has a certain gastric mucous membrane stimulation symptoms, can be taken after meals. After taking emergency contraceptive drugs, after a few days will appear vaginal bleeding phenomenon, belong to the normal physiological reaction, because the main components of emergency contraceptive drugs is estrogen and progesterone, and the content is relatively large, after stopping the use of drugs, there will be withdrawal bleeding.