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We present a case of ectopic tubal pregnancy after the use of oral levonorgestrel as an emergency contraceptive in a 37\u2010year\u2010old woman with a history of treatment for <jats:italic>Chlamydia trachomatis<\/jats:italic> infection. She conceived after sexual intercourse on menstrual day 14 of the first menstrual cycle following a normal delivery. After salpingectomy for this right tubal pregnancy, her following pregnancy was an ectopic pregnancy in the contralateral tube, which was treated with laparoscopic salpingectomy. Histopathological examination revealed endometriosis. We should be aware of ectopic pregnancy even after emergency contraceptive use, especially in patients with risk factors, such as <jats:italic>Chlamydia<\/jats:italic> infection and endometriosis. Because the efficacy of levonorgestrel decreases after ovulation, we should check the stage of the cycle before prescription.<\/jats:p>","DOI":"10.1111\/jog.13815","type":"journal-article","created":{"date-parts":[[2018,9,24]],"date-time":"2018-09-24T02:05:11Z","timestamp":1537754711000},"page":"473-476","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Ectopic pregnancy following oral levonorgestrel emergency contraception use"],"prefix":"10.1111","volume":"45","author":[{"given":"Yohei","family":"Kitani","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology Niigata University Medical and Dental Hospital  Niigata Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6445-4066","authenticated-orcid":false,"given":"Tatsuya","family":"Ishiguro","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Niigata 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