{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T08:38:38Z","timestamp":1777451918592,"version":"3.51.4"},"reference-count":29,"publisher":"SAGE Publications","issue":"2","license":[{"start":{"date-parts":[[2010,2,1]],"date-time":"2010-02-01T00:00:00Z","timestamp":1264982400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Antiviral Therapy"],"published-print":{"date-parts":[[2011,2]]},"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Women of childbearing age represent a growing proportion of people living with HIV. Preventing pregnancy is important in HIV-infected women receiving efavirenz as part of their antiretroviral therapy.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      The effects of coadministration of efavirenz (600 mg once daily) on the pharmacokinetics (PK) of the active components (ethinyl estradiol [EE] and 17-deacetyl norgestimate [NGMN]) of Ortho Cyclen\u00ae (Ortho-McNeil-Janssen Pharmaceuticals, Inc., Raritan, NJ, USA) were investigated in 28 healthy HIV-negative women. The peak plasma concentration (C\n                      <jats:sub>max<\/jats:sub>\n                      ), area under the concentration\u2013time curve for a dosing interval (AUC\n                      <jats:sub>[\u03c4]<\/jats:sub>\n                      ), and lowest plasma concentration (C\n                      <jats:sub>min<\/jats:sub>\n                      ) for EE and NGMN during cycles of treatment with Ortho Cyclen with and without coadministration of efavirenz were compared. Additionally, a post hoc exploratory analysis was conducted to assess the effect of efavirenz on the PK of an additional progestin, levonorgestrel (LNG).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Exposures to EE were similar during coadministration of efavirenz and Ortho Cyclen to those during administration of Ortho Cyclen alone. Exposures to NGMN were substantially decreased following coadministration of efavirenz and Ortho Cyclen (adjusted geometric means for C\n                      <jats:sub>max<\/jats:sub>\n                      , AUC\n                      <jats:sub>[\u03c4]<\/jats:sub>\n                      and C\n                      <jats:sub>min<\/jats:sub>\n                      decreased by 46%, 64% and 82%, respectively) compared with Ortho Cyclen alone. Consistent with NGMN, LNG exposures were decreased 80\u201386% by efavirenz.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Although efavirenz had no significant effect on the PK of EE, exposures to the progestin components of Ortho Cyclen, NGMN and LNG, were substantially reduced. The results reinforce the need to use reliable methods of barrier contraception, even when taking oral contraceptives and efavirenz.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3851\/imp1725","type":"journal-article","created":{"date-parts":[[2011,2,7]],"date-time":"2011-02-07T05:20:23Z","timestamp":1297056023000},"page":"149-156","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":52,"title":["The Effect of Efavirenz on the Pharmacokinetics of An Oral Contraceptive Containing Ethinyl Estradiol and Norgestimate in Healthy HIV-Negative Women"],"prefix":"10.1177","volume":"16","author":[{"given":"Heather","family":"Sevinsky","sequence":"first","affiliation":[{"name":"Research and Development, Bristol\u2013Myers Squibb, Princeton, NJ, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Timothy","family":"Eley","sequence":"additional","affiliation":[{"name":"Research and Development, Bristol\u2013Myers Squibb, Princeton, NJ, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anna","family":"Persson","sequence":"additional","affiliation":[{"name":"Research and Development, Bristol\u2013Myers Squibb, Princeton, NJ, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dennis","family":"Garner","sequence":"additional","affiliation":[{"name":"Research and Development, Bristol\u2013Myers Squibb, Princeton, NJ, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cynthia","family":"Yones","sequence":"additional","affiliation":[{"name":"Research and Development, Bristol\u2013Myers Squibb, Princeton, NJ, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard","family":"Nettles","sequence":"additional","affiliation":[{"name":"Research and Development, Bristol\u2013Myers Squibb, Princeton, NJ, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kathryn","family":"Krantz","sequence":"additional","affiliation":[{"name":"Research and Development, Bristol\u2013Myers Squibb, Princeton, NJ, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard","family":"Bertz","sequence":"additional","affiliation":[{"name":"Research and Development, Bristol\u2013Myers Squibb, Princeton, NJ, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jenny","family":"Zhang","sequence":"additional","affiliation":[{"name":"Research and Development, Bristol\u2013Myers Squibb, Princeton, NJ, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2010,2,1]]},"reference":[{"key":"bibr1-IMP1725","doi-asserted-by":"publisher","DOI":"10.1093\/humupd\/dmn049"},{"key":"bibr2-IMP1725","doi-asserted-by":"publisher","DOI":"10.1111\/j.1468-1293.2008.00634.x"},{"key":"bibr3-IMP1725","doi-asserted-by":"publisher","DOI":"10.1001\/jama.300.5.555"},{"key":"bibr4-IMP1725","unstructured":"Panel on Antiretroviral Guidelines for Adults and Adolescents. Guidelines for the use of antiretroviral agents in HIV-1-infected adults and adolescents. December 4, 2009. Department of Health and Human Services (Accessed 10 December 2009.) Available from http:\/\/www.aidsinfo.nih.gov\/ContentFiles\/AdultandAdolescentGL.pdf."},{"key":"bibr5-IMP1725","volume-title":"US prescribing information","author":"Sustiva (efavirenz).","year":"2009"},{"key":"bibr6-IMP1725","volume-title":"Summary of product characteristics","author":"Sustiva (efavirenz).","year":"2009"},{"key":"bibr7-IMP1725","first-page":"CD003283","volume":"3","author":"Van Vliet H.A.","year":"2006","journal-title":"Cochrane Database Syst Rev"},{"key":"bibr8-IMP1725","first-page":"CD004861","volume":"3","author":"Maitra N.","year":"2004","journal-title":"Cochrane Database Syst Rev"},{"key":"bibr9-IMP1725","doi-asserted-by":"publisher","DOI":"10.1080\/13625180701829952"},{"key":"bibr10-IMP1725","volume-title":"US prescribing information","author":"Isentress (raltegravir)","year":"2009"},{"key":"bibr11-IMP1725","doi-asserted-by":"publisher","DOI":"10.1124\/jpet.300.2.549"},{"key":"bibr12-IMP1725","doi-asserted-by":"publisher","DOI":"10.1016\/S0010-7824(02)00473-0"},{"key":"bibr13-IMP1725","doi-asserted-by":"publisher","DOI":"10.1016\/S0009-9236(03)00202-9"},{"key":"bibr14-IMP1725","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-2125.2000.00271.x"},{"key":"bibr15-IMP1725","doi-asserted-by":"publisher","DOI":"10.1046\/j.0306-5251.2001.01521.x"},{"key":"bibr16-IMP1725","doi-asserted-by":"publisher","DOI":"10.1007\/s002280050543"},{"key":"bibr17-IMP1725","doi-asserted-by":"publisher","DOI":"10.1016\/0010-7824(94)90043-4"},{"key":"bibr18-IMP1725","volume-title":"US prescribing information","author":"Ortho Tri-Cyclen L.O.","year":"2008"},{"key":"bibr19-IMP1725","volume-title":"US prescribing information","author":"Ortho Cyclen (norgestimate\/ethinyl estradiol).","year":"2008"},{"key":"bibr20-IMP1725","unstructured":"US Food and Drug Administration. Guidance for industry: drug interaction studies \u2013 study design, data analysis, and implications for dosing and labeling. September 2006. (Accessed 4 December 2009.) Available from http:\/\/www.fda.gov\/downloads\/Drugs\/GuidanceComplianceRegulatoryInformation\/Guidances\/ucm072101.pdf."},{"key":"bibr21-IMP1725","unstructured":"NIH Clinical Center. Progesterone historical reference ranges. National Institutes of Health. (Updated 20 March 2009. Accessed 4 December 2009.) Available from http:\/\/cclnprod.cc.nih.gov\/dlm\/testguide.nsf\/Index\/CB26894E1EB28DEF85256BA5005B000E?OpenDocument."},{"key":"bibr22-IMP1725","doi-asserted-by":"publisher","DOI":"10.3109\/00016349209156509"},{"key":"bibr23-IMP1725","doi-asserted-by":"publisher","DOI":"10.1254\/jphs.08209FP"},{"key":"bibr24-IMP1725","doi-asserted-by":"publisher","DOI":"10.1007\/s00228-008-0492-8"},{"key":"bibr25-IMP1725","doi-asserted-by":"publisher","DOI":"10.1093\/aje\/kwi116"},{"key":"bibr26-IMP1725","doi-asserted-by":"publisher","DOI":"10.1038\/sj.clpt.6100040"},{"key":"bibr27-IMP1725","doi-asserted-by":"publisher","DOI":"10.1016\/j.fertnstert.2007.07.1348"},{"key":"bibr28-IMP1725","doi-asserted-by":"publisher","DOI":"10.1016\/j.contraception.2007.10.002"},{"key":"bibr29-IMP1725","doi-asserted-by":"publisher","DOI":"10.1783\/147118907782101724"}],"container-title":["Antiviral Therapy"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.3851\/IMP1725","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.3851\/IMP1725","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T12:49:53Z","timestamp":1777380593000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.3851\/IMP1725"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2010,2,1]]},"references-count":29,"journal-issue":{"issue":"2","published-print":{"date-parts":[[2011,2]]}},"alternative-id":["10.3851\/IMP1725"],"URL":"https:\/\/doi.org\/10.3851\/imp1725","relation":{},"ISSN":["1359-6535","2040-2058"],"issn-type":[{"value":"1359-6535","type":"print"},{"value":"2040-2058","type":"electronic"}],"subject":[],"published":{"date-parts":[[2010,2,1]]}}}