Estimating the efficacy of emergency contraception—how reliable are the data?

Stirling, Alex; Glasier, Anna

doi:10.1016/s0010-7824(02)00310-4

Cited by 60 publications

(25 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More than half (51%) of women with LH levels >20 IU/l were not within 1 day either side of the predicted ovulation dates 2. Of 32 women estimated to be in the luteal phase, because they knew the date of their last period and had regular cycles, 14 of them had not yet ovulated 3. All this confirms that estimates of risk based on last menstrual period and cycle length are very poor.…”

mentioning

confidence: 77%

Pitfalls of adapting emergency contraception CEU guidance

Webb

McGough²,

Melvin³

2012

J Fam Plann Reprod Health Care

View full text Add to dashboard Cite

mentioning

confidence: 77%

Pitfalls of adapting emergency contraception CEU guidance

Webb

McGough²,

Melvin³

2012

J Fam Plann Reprod Health Care

View full text Add to dashboard Cite

“…However, UPA is structurally similar to mifepristone, and several evidences suggest that a post-fertilization mechanism of action is also effective. This effect is considered to be contragestion versus contraceptive; that's why UPA administration is contraindicated in a known or suspected pregnancy and it could be used as an effective abortifacient [28]. Health care providers should inform patients about both mechanisms of action.…”

Section: Upamentioning

confidence: 99%

“…These calculations are fraught with difficulties and the effectiveness of EC has probably been overestimated [5,7,28,29]. Several clinical trials have been published comparing the efficacy of LNG ECPs and UPA.…”

Section: Clinical Efficacymentioning

confidence: 99%

Nowadays which emergency contraception? Comparison between past and present: latest news in terms of clinical efficacy, side effects and contraindications

Gizzo¹,

Fanelli²,

Gangi³

et al. 2012

Gynecological Endocrinology

View full text Add to dashboard Cite

Despite many highly effective methods of contraception are available nowadays, many pregnancies are unintended. Emergency contraception (EC) is the use of drug or device after unprotected intercourse to prevent an unwanted pregnancy. It is a woman's last chance to prevent unintended pregnancy. Nevertheless the confusion about mechanisms of action, side effects, clinical efficacy and controindications makes the intervention underused in every setting investigated. So far levonorgestrel (LNG) has been considered the gold standard for oral EC. Today, a new type of second generation progesterone receptor modulator, ulipristal acetate (UPA) has been proposed as a more effective drug than LNG in prevention of unwanted pregnancies by delaying or inhibiting ovulation; even if many other devices are disposable in commerce. We revised the literature to concern most of the data available on the role of EC and moreover clarifying the available methods, the action windows of the accessible devices, the adverse events and the controindications.

show abstract

“…Recent analysis has suggested that the effectiveness of emergency contraception has probably been overestimated due to incorrect assessment of pregnancy risk at the time of use [20]. For instance, in one study, 30% of women presenting for emergency contraception had inaccurately dated their own menstrual cycles, believing themselves to be in the fertile phase of their cycle when they were not [21].…”

Section: Efficacy Ratesmentioning

confidence: 99%