"The Medicines and Healthcare Products Regulatory Agency (MHRA) in the United Kingdom has issued a new warning to women using the emergency contraceptive drugs levonorgestrel and ulipristal, saying that they may not work if they take some other me"...
Combination oral contraceptives act by suppression of gonadotropins. Although the primary mechanism of this action is inhibition of ovulation, other alterations include changes in the cervical mucus (which increase the difficulty of sperm entry into the uterus) and the endometrium (which reduce the likelihood of implantation).
Last reviewed on RxList: 3/24/2008
This monograph has been modified to include the generic and brand name in many instances.
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