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Clomiphene failure? Try adding dexamethasone to your clomiphene infertility regimen

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Clomiphene-resistant women often ovulate, and then become pregnant, when treated with a combination of clomiphene and dexamethasone


 

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CASE Infertility Dx: PCOS, anovulation

You have been treating a 33-year-old G0P0 woman who has polycystic ovary syndrome (PCOS) and anovulatory infertility with clomiphene citrate for three cycles, at escalating doses of 50 mg, 100 mg, and 150 mg daily. She has not ovulated, however, as determined by appropriately timed serum progesterone measurement.

What is your next step?

Anovulation is a common cause of infertility; approximately 70% of cases of anovulatory infertility are caused by PCOS. For women who have PCOS and anovulatory infertility, approaches to ovulation induction include:

  • weight loss
  • clomiphene
  • metformin
  • follicle-stimulating hormone (FSH) injection
  • laparoscopic ovarian drilling
  • in vitro fertilization (IVF).

Women who fail to ovulate at standard dosages of clomiphene are labeled “clomiphene-resistant.” A consensus panel of expert fertility specialists recommended that, for such women, the most appropriate next steps in treatment include FSH injection or laparoscopic ovarian drilling.1 For many women, however, those options are prohibitively expensive.

For a clomiphene-resistant woman who has PCOS, then, what affordable treatment can you prescribe?

One answer is that many clomiphene-resistant women will ovulate if they are treated with a combination of clomiphene and dexamethasone.2-16 Here is a stepwise approach to using clomiphene with dexamethasone.

STEP 1 Review the infertility work-up

The standard infertility work-up includes hysterosalpingography, semen analysis, and test of ovulation. If the work-up shows severely abnormal semen parameters or bilateral tubal disease, consultation with a fertility specialist, and IVF, might be a more appropriate course than undertaking ovulation induction with clomiphene.

Further work-up of anovulatory infertility. First obtain measurements of serum thyroid-stimulating hormone (TSH), follicle-stimulating hormone (FSH), and prolactin; abnormalities of these hormones might contraindicate clomiphene for ovulation induction.

Next, measurement of total serum testosterone and dehydroepiandrosterone sulfate (DHEAS) might be useful to determine if your patient’s clomiphene resistance is caused by significantly elevated androgen levels.

Then, if your clomiphene resistant patient has a normal hysterosalpingogram (HSG) and normal TSH, FSH, and prolactin test results, and her partner has a normal semen analysis, consider that she might benefit from treatment with a combination of clomiphene and dexamethasone.

STEP 2 Induce ovulation with clomiphene plus dexamethasone

One cause of clomiphene resistance is an elevated serum testosterone level.7 Other causes include an elevated body-mass index and advanced age. Dexamethasone can improve the efficacy of clomiphene by reducing androgen levels.

What trials have demonstrated. Two randomized clinical trials have shown that, in clomiphene-resistant women, dexamethasone plus clomiphene increases ovulation and the pregnancy rate, compared with clomiphene alone.2,3

One regimen that has been reported to be successful is to treat the clomiphene-resistant woman with clomiphene, 100 mg daily, for cycle Days 3 to 7, and simultaneously treat her with dexamethasone, 2 mg daily, for cycle Days 3 to 12 (FIGURE).2 Treatment with dexamethasone reduces the serum concentration of androgens, thereby increasing the efficacy of clomiphene.

In the randomized trial that used this regimen to treat clomiphene-resistant women, the ovulation rate was 75% in the clomiphene plus dexamethasone group and 15% in the clomiphene-only group (P <.001). The pregnancy rate was 40% in the clomiphene plus dexamethasone group and 5% in the clomiphene-only group (P <.05).

Many clinicians instruct their patients to take the dexamethasone at night to maximally blunt the early morning adrenocorticotropic (ACTH) surge, which stimulates adrenal androgen production. I have found, however, that, for many women, a nighttime dose of dexamethasone energizes them and causes difficulty falling, and remaining, asleep. I recommend that patients take dexamethasone in the morning.

Note: Before initiating a clomiphene plus dexamethasone cycle, many experts 1) obtain a pregnancy test to rule out ongoing pregnancy and then 2) prescribe progestin withdrawal. A commonly used agent for progestin withdrawal is medroxyprogesterone acetate (Provera), 10 mg/d for 5 days. The first day of full withdrawal flow after cessation of progestin treatment is considered Day 1 of the cycle.

During the clomiphene plus dexamethasone treatment cycle, the patient can take urine luteinizing hormone (LH) measurements at home to identify the preovulatory LH surge, which typically occurs 5 to 12 days after the last day of clomiphene medication (FIGURE). The woman’s maximal fertile span is the day before the LH surge, the day of the LH surge, and the day following the LH surge. Coitus should occur on at least 2 of these 3 days.

If the patient prefers not to measure urine LH, recommend that she have coitus every other day for 8 days, beginning 5 days after the last clomiphene tablet.


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