How to Choose Oral Ovulation Induction Medication?
Oral ovulation induction medications are commonly used for women with anovulation, abnormal ovulation, such as polycystic ovary syndrome, and unexplained infertility.
They may also be used when preparing for intrauterine insemination, IUI, or IVF, to increase the number of eggs and improve pregnancy rates.
Clomiphene is the most commonly used oral ovulation induction medication.
Its advantage is that it is relatively inexpensive.
It is usually taken starting from day 3 to day 5 of the menstrual cycle, for 5 consecutive days.
Ovulation usually occurs within one week, starting around the fifth day after stopping the medication.
The doctor will use ultrasound examination or urine testing, ovulation test strips, to estimate when the follicles are mature.
The disadvantage is that in some patients, Clomiphene may suppress endometrial thickness and reduce cervical mucus.
This may lower the chance of successful pregnancy.
Among women taking Clomiphene, about 80% will ovulate, the pregnancy rate ranges from 10% to 40%, and there is about a 7% chance of having twins.
For women who do not ovulate despite using Clomiphene, or those whose endometrium becomes too thin after taking it, Letrozole may be considered.
Letrozole was originally used for breast cancer treatment.
Using it for ovulation induction in infertility is considered off-label use.
It is taken starting from day 3 of the menstrual cycle, for 5 consecutive days.
Compared with Clomiphene, Letrozole has the advantage of producing a higher proportion of single mature follicles, so the risk of multiple pregnancy is lower.
It also does not affect endometrial growth or the thickness of cervical mucus.
The disadvantage is that it is more expensive.
Multiple studies have shown that in women with ovulation disorders, Letrozole results in better ovulation rates and pregnancy rates than Clomiphene.
Oral ovulation induction medications are not suitable for all women with infertility.
If a woman is over 40 years old, has diminished ovarian function, or has problems with both fallopian tubes, oral ovulation induction treatment is not recommended.
If pregnancy has not occurred after 3 to 6 months of treatment, further infertility evaluation and assisted reproductive treatment should be considered.
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