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A new era in ovulation induction.

Hananel Holzer1, Robert Casper, Togas Tulandi

  • 1Department of Obstetrics and Gynecology, McGill University, Montreal, Quebec, Canada.

Fertility and Sterility
|April 6, 2006
PubMed
Summary
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Aromatase inhibitors like letrozole are effective for ovulation induction and superovulation, showing comparable or better results than clomiphene citrate without negative endometrial effects. Their role in IVF needs further study.

Area of Science:

  • Reproductive Endocrinology
  • Pharmacology

Background:

  • Ovulation induction is crucial for fertility treatments.
  • Clomiphene citrate (CC) is a common ovulation-inducing drug but has limitations.
  • Aromatase inhibitors offer a potential alternative for ovulation induction and superovulation.

Purpose of the Study:

  • To evaluate the efficacy of aromatase inhibitors in ovulation induction, superovulation, and in vitro fertilization (IVF).

Main Methods:

  • A comprehensive literature search was performed using keywords such as 'aromatase inhibitor,' 'letrozole,' 'anastrazole,' 'ovulation induction,' and 'superovulation.'
  • Databases searched included MEDLINE, EMBASE, and the Cochrane Database of systematic reviews.

Main Results:

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  • Letrozole demonstrated ovulation induction rates of 70%-84% and pregnancy rates of 20%-27% per cycle.
  • Aromatase inhibitors showed comparable or superior efficacy to clomiphene citrate in ovulation induction and superovulation.
  • Unlike clomiphene citrate, aromatase inhibitors do not negatively impact endometrial thickness.

    • Conclusions:

    • Aromatase inhibitors are effective alternatives to clomiphene citrate for ovulation induction and superovulation.
    • Their favorable endometrial profile makes them advantageous over clomiphene citrate.
    • Further research is needed to determine the role of aromatase inhibitors in IVF.