Low-dosage clomiphene reduces premature ovulation rates and increases transfer rates in natural-cycle IVF

von Wolff, Michael; Nitzschke, M; Stute, Petra; Bitterlich, N; Rohner, Susanne (2014). Low-dosage clomiphene reduces premature ovulation rates and increases transfer rates in natural-cycle IVF. Reproductive biomedicine online, 29(2), pp. 209-215. Elsevier 10.1016/j.rbmo.2014.04.013

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Natural-cycle IVF has been suggested as an alternative IVF treatment. However, efficacy is limited due to high premature ovulation rates, resulting in low transfer rates. This study investigates whether low dosages of clomiphene citrate reduce premature ovulation rate and increase transfer rate. Of 112 women included (aged 35.2 ± 4.5 years) 108 underwent one natural-cycle IVF cycle with human chorionic gonadotrophin (HCG) to induce ovulation and 103 underwent one natural-cycle IVF cycle with 25 mg/day clomiphene from about day 7 until HCG administration. Before retrieval, 1.2 monitoring consultations per cycle were required. Clomiphene reduced premature ovulation rate, from 27.8% without to 6.8% with clomiphene (P < 0.001) and increased transfer rate from 39.8% to 54.4% (P = 0.039). Clinical pregnancy rates without and with clomiphene were 27.9% versus 25.0% per transfer and 11.1% versus 13.6% per initiated cycle. Use of clomiphene resulted in mild hot flushes and headache in 5% of patients. Nausea and persisting ovarian cyst formation was not observed. In conclusion, clomiphene citrate led to very few side effects, required 1.2 monitoring consultations, significantly reduced premature ovulation rate and significantly increased transfer rate per initiated cycle, an effect which was not age dependent.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Gynaecology

UniBE Contributor:

von Wolff, Michael, Stute, Petra, Rohner, Susanne


600 Technology > 610 Medicine & health








Nathalie Ursula Becher

Date Deposited:

13 May 2015 10:22

Last Modified:

05 Dec 2022 14:47

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

clomiphene citrate; IVF; natural cycle; ovulation





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