Taking long-term contraceptive pills can not completely contraceptive, it is still necessary to do a good job of protection. Taking long-term birth control pills is to inhibit ovulation to play the role of contraception, the effect of the duration of a relatively long time, generally can be maintained for about a month, such as deoxypregnene ethinyl estradiol tablets. Although the effect of taking long-term contraceptive pills is good, but the success rate is not 100%, in order to ensure safety, it is recommended to do a good job of protection measures. Although taking long-term contraceptive pills on the organism is relatively small damage, but it contains hormones is more, will lead to the emergence of some side effects, such as early pregnancy reaction, menstrual disorders, etc., so you need to take contraceptive pills under the guidance of a doctor to avoid adverse effects.