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Clomifene citrate has long been associated with a multiple pregnancy rate of up to 8–10%. Studies from which these figures originated have largely included patients who received clomifene outside of current national and international treatment guidelines. In January 2020, a systematic review of MEDLINE and relevant reference lists was conducted. Studies were included that reported multiple pregnancy rate in a cohort of patients undergoing treatment with single agent clomifene citrate for WHO group II dysovulatory subfertility. Twelve studies were included in the analysis, with a total sample size of 1,387 patients. The overall multiple pregnancy rate was 3.8% (3.6% twins/0.2% triplets); this dropped to 2.4% (all twins) when studies with a mean BMI ≥35kg/m 2  were excluded. This review suggests that contemporary single agent clomifene use following current guidelines in terms of indication, results in a lower than expected multiple pregnancy rate. Further evidence from clinical practice is required to ensure that patients are adequately informed.

Multiple pregnancy rate in patients undergoing treatment with clomifene citrate for WHO group II ovulatory disorders: a systematic review