There has been much debate regarding levonorgestrel emergency contraception's (LNG-
EC's) method of action since 1999 when the Food and Drug Administration first approved its …

OBJECTIVE: To model the effectiveness that can be obtained if levonorgestrel-only
emergency contraception (EC) acts only through disrupting ovulation, in relation to other …

BACKGROUND: Although widely used, the mechanisms of action of the levonorgestrel
emergency contraceptive pill (LNG ECP) are still unclear. There are increasing data to …

Background: Recent studies have identified that levonorgestrel administered orally in
emergency contraception (LNG-EC) is only efficacious when taken before ovulation …

A major barrier to the widespread acceptability and use of emergency contraception (EC)
are concerns regarding the mechanisms of action of EC methods. Today, levonorgestrel …

The United States Food and Drug Administration‐approved progestin‐only dosing strategy
for emergency contraception is levonorgestrel 0.75 mg taken as soon as possible within 72 …

Emergency contraception (EC) consists of either 1.5 mg of levonorgestrel (LNG) in one or
two doses, or a combination of LNG with ethinylestradiol, administered for up to 5 days after …

Emergency contraception can prevent most pregnancies when taken after intercourse. It
provides an important back-up in cases of unprotected intercourse or contraceptive accident …

BACKGROUND: Levonorgestrel is an effective method for emergency contraception (EC)
and is used worldwide. Consistent with its mechanism of action in delaying ovulation, the …

OBJECTIVE: To assess the possibility of a postfertilization effect in regard to the most
common types of hormonal emergency contraception (EC) used in the US and to explore the …