Emergency contraceptive pills are not recommended for women over 45 years of age and the combination short-acting contraceptive pill is not recommended for contraception. Birth control pills are formed from synthetic estrogen and progesterone and are categorized as emergency contraceptives and combined short-acting contraceptives. Women over 40 years of age who take oral contraceptives to form blood clots significantly increased risk, and emergency contraceptive pills contain a larger amount of estrogen and progesterone, for the compound short-acting contraceptives about 10 times, after taking the drug to form blood clots risk is even greater, so it is recommended that women 45 years of age do not take emergency contraceptives to contraceptives by mouth. Therefore, 45-year-old women are advised not to use oral emergency contraceptive pills for contraception. 45-year-old women are advised to use condoms or contraceptive rings for contraception.