How should letrozole tablets be taken?

According to epidemiological surveys, the incidence of infertility is approximately 10%. Currently, due to changes in human behavior and lifestyle, as well as environmental pollution, this incidence is gradually increasing, affecting a substantial population. Consequently, new ovulation-inducing agents have emerged. Femara (letrozole tablets) is one such agent among many available ovulation stimulants. How should Femara (letrozole tablets) be taken for ovulation induction?

How to Take Letrozole Tablets

Dosage and administration of letrozole tablets: 2.5 mg orally once daily. No dose adjustment is required for elderly patients or those with impaired hepatic or renal function. Timing of administration—morning or evening—is not critical.

Contraindications: Letrozole is contraindicated in patients with hypersensitivity to the drug or its excipients. It should be used with caution in premenopausal women and in patients with severe hepatic or renal impairment.

Letrozole inhibits aromatase activity, thereby blocking the conversion of androgens to estrogens and reducing systemic estrogen levels. This alleviates the negative feedback effect of estrogen on the hypothalamus and pituitary gland, leading to increased endogenous gonadotropin secretion, which promotes follicular development and ovulation. While letrozole demonstrates favorable ovulation-inducing efficacy, the duration required for clinical effect varies among individuals.

When taking letrozole tablets, avoid concomitant use with other estrogen-containing medications, as estrogen may counteract the pharmacological action of letrozole.

Letrozole reduces circulating estrogen levels; prolonged use may lead to decreased bone mineral density, and therefore long-term administration is not recommended.

Letrozole also acts locally within the ovary, inhibiting the conversion of androgen substrates into estrogen. This results in intra-ovarian accumulation of androgens, thereby enhancing follicular sensitivity to follicle-stimulating hormone (FSH) and promoting both follicular growth and estrogen biosynthesis. Moreover, unlike clomiphene citrate, letrozole does not bind to estrogen receptors and thus avoids adverse effects on endometrial thickness and cervical mucus.

We hope the above information is helpful to you. Wishing you a happy and healthy life!