You can take vitamin C after taking the emergency contraceptive pill, it will not affect the contraceptive effect nor will it play a role in alleviating adverse reactions. The amount of hormones contained in the morning-after emergency contraceptive pill is large and can interfere with the normal endocrine secretion in the body, resulting in nausea, vomiting, dizziness, menstrual cycle disorders, irregular vaginal bleeding, and even amenorrhea and infertility. It should not be taken more than three times a year, and only once a month at most. It is only effective for sexual intercourse within 72 hours before the use of the pill, and other safety measures need to be taken to have sex again, and is not recommended as a regular contraceptive measure. In addition, in vitro ejaculation and the safety period are both also relatively unreliable methods and are not recommended.