Contraceptive pills bring convenience to people, but also bring certain side effects. Especially when used inappropriately, the side effects can be more pronounced and even cause illness. It was reported that a 25-year-old woman suffered from deep vein thrombosis in her lower limbs as a result of long-term oral contraceptive use. If the pill is taken for a long time, the estrogen in the pill will increase the coagulation component of the blood, resulting in increased blood viscosity and slowed blood flow, which can lead to venous thrombosis. What are the best contraceptives to use in life? First of all, it is better to use oral short-acting contraceptives, because they have fewer side effects and a higher chance of contraception. In addition, the most common, efficient and safe contraceptive is the use of condoms, which is also the first choice of most people. After all, medications are not without their side effects, and birth control pills can have certain side effects. Emergency contraceptive pills should not be taken regularly Emergency contraceptive pills are often used as a remedial measure, and their side effects are much greater than those of oral contraceptives, which are taken regularly. Emergency contraceptive pills contain a large amount of progesterone, which can inhibit ovarian ovulation, and high doses of progesterone can induce thrombosis, menstrual disorders, ectopic pregnancy and other diseases, the incidence of deep vein thrombosis in women who have been taking oral contraceptives for a long period of time in large doses will increase by 4 to 8 times. Therefore, emergency contraceptive pills should only be taken one pill during a menstrual cycle, or even a maximum of two pills a year.