When Clomid Does Not Achieve Ovulation

Clomid Resistance and Ways to Improve Ovulation Response to Clomid

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Don't worry if your first or even second cycle of Clomid doesn't work. There may be other ways your doctor can help you. Ron Levine/Digital Vision/Getty Images

While 75% of women taking Clomid for anovulation will ovulate, 25% will not. Without ovulation, pregnancy achievement is impossible. If you don't achieve ovulation on Clomid, will you need to move on to stronger drugs or more complex treatments? Not necessarily.

Clomid Resistance

Sometimes, the reason you may not ovulate on Clomid is because the dosage is too low. It's common to start Clomid treatment at 50 mg, and then increase to 100 mg if you don't respond to 50 mg.

In some cases, doctors will try doses up to 250 mg. However, if you're still not ovulating, your doctor may say you are Clomid resistant.

Clomid resistance is just a fancy way of saying that your body does not respond the way we'd like to Clomid.

What Causes Clomid Resistance?

Your doctor's approach to treating Clomid resistance depends partially on why he thinks you are not responding. Here are a few known, possible reasons for Clomid resistance:

PCOS: Women with PCOS commonly have trouble with Clomid resistance, especially those who are diagnosed as insulin resistant or with hyperandrogenic levels (high levels of DHEAs and male hormone levels).

BMI over 25: A body mass index (BMI) over 25 can decrease the chances of Clomid working successfully.

Hyperprolactinemia: Women with hyperprolactinemia may not respond well to Clomid, without also treating the hyperprolactinemia.

Of course, there are times when it's not clear why Clomid is not helping induce ovulation.

Options in Treating Clomid Resistance

For women with PCOS, treatment with the insulin resistance drug Metformin, also known as Glucophage, may help. Ideally, Metformin would usually be prescribed for a period of three to six months before trying Clomid again. Some studies have shown that besides improving ovulation rates, taking metformin and Clomid together may also increase the pregnancy rate and decrease the risk of miscarriage.

Ovarian drilling is an older method of treating Clomid resistance in women with PCOS, but is not commonly used today because of the risks. If your doctor suggests ovarian drilling, you may want to question the reason for that choice, when there are other options that can and should be tried first.

If your BMI is over 25, your doctor may suggest that you lose some weight before retrying Clomid. Losing just 10% of your current body weight may improve Clomid's effect.

For those with hyperprolectinemia, treatment with the drug Bromocriptine, either alone or in combination with Clomid, may improve ovulation rates.

Birth Control Pills for Infertility?

One interesting way of dealing with Clomid resistance is taking birth control pills for one to two months before trying another cycle of Clomid. This is recommended for women with high levels of the hormone DHEAs.

It seems a bit counterintuitive -- birth control pills will help you get pregnant? But research studies have shown good results. In one study on the use of birth control pills, just over 65% of Clomid resistant women ovulated, after taking oral birth control pills for two months preceding a cycle of Clomid treatment.

What if Clomid Still Does Not Work?

Sometimes, ultrasound will show the follicles growing in response to Clomid, but the midcycle LH surge isn't strong enough to bring on ovulation. In this case, your doctor may prescribe Clomid along with an injection of hCG, like the drug Ovidrel, to trigger ovulation and boost the midcycle LH surge.

If after trying these options, you're still not ovulating on Clomid, your doctor may suggest trying different ovarian stimulating medications. Hopeful studies are emerging about the medication Letrozole, also known as Femara. Studies have shown that Letrozole may induce ovulation in some women with PCOS who do not respond to Clomid, as well as some women with unexplained infertility and Clomid resistance.

In one study, women with Clomid resistance and PCOS were more likely to ovulate when taking the medication Letrozole (79.3% ovulated), than when taking Clomid in combination with two, low dose injections of FSH therapy (56.59% ovulated). Pregnancy rates were also improved, with 23% of the women taking Letrozole achieving pregnancy, and 14% achieving pregnancy with the Clomid and two injections of low-dose FSH combination.

Letrozole is not, however, sold as a fertility drug, and there is some controversy over the safety of its use. Letrozole can cause birth defects if taken during pregnancy. Many argue that the medication is safe and say that the drug should be out of your system by the time pregnancy occurs, though more research needs to be done.

Other options for treating Clomid resistance include low-dose gonadotropin therapy, with or without IUI treatment. This includes drugs like Gonal-F, Follistim, and Ovidrel, in other words recumbent FSH and LH fertility drugs. These drugs are more expensive and come with more side effects than Clomid, but they may induce ovulation when Clomid fails.

More about Clomid:


Ganesh A, Goswami SK, Chattopadhyay R, Chaudhury K, Chakravarty B. Comparison of letrozole with continuous gonadotropins and clomiphene-gonadotropin combination for ovulation induction in 1387 PCOS women after clomiphene citrate failure: a randomized prospective clinical trial. Journal of Assisted Reproduction and Genetics. 2009 Jan 7. [Epub ahead of print]

Goenka Deepak, Goenka ML. Oral contraceptive pill pretreatment for clomiphene citrate resistant cases followed by repeat clomiphene citrate treatment. The Journal of Obstetrics and Gynecology of India. Vol. 56, No. 2 : March/April 2006 Pg 159-161. Accessed online February 19, 2009. http://medind.nic.in/jaq/t06/i2/jaqt06i2p159.pdf

Using Oral Contraceptives as a Treatment for Clomid-Resistant Patients. The InterNational Council on Infertility Information Dissemination: Infertility Journal Summaries. Accessed online February 19, 2009.

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