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YAZ is not really any different from any other form of hormonal birth control in that it is made up of a synthetic estrogen and progestin (synthetic progesterone) combination; what makes YAZ different is the use of drospirenone as the progestin--drospirenone is closer to natural progesterone than other progestins. Birth control pills work by preventing ovulation; a secondary action of combination pills is a thickening of the cervical mucus, making it difficult for sperm to pass through the cervix and into the uterus.
A missed pill means just that--a missed pill, usually due to forgetfulness. A late pill is different--it requires no doubling up. An hour or two late is not a big deal, but it's a good idea to take the pill at the same time every day--not only so that the level of hormone in the system stays even, but so that the pill is not forgotten. Taking a pill should be part of a routine.
You should always double-up on birth control methods if you're not willing to deal with the consequences of a child. The burden of birth control should be shared between partners. Using a barrier method such as condoms is always a smart choice in conjunction with a hormonal method like a birth control pill.
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If I am not better, at least I am different. --Jean-Jacques Rousseau
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