How does femara (letrozole) improve fertility in women who already ovulate on their own?

Improve ovulation. Femara (letrozole) may improve the quality of your ovulation if you ovulate on your own already. It depends. This is something you need to discuss in detail with the doctor who may be prescribing it for you.
Maybe. In women who ovulate Femara (letrozole) appears to increase the chances of getting pregnant to a lesser degree than if the woman does not ovulate. It is an aromatase inhibitor and as such decreases the production of Estrogen by the ovaries with increase in FSH and developing multiple follicles with the release of multiple eggs.

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