Levonorgestrel release rates over 5 years with the Liletta® 52-mg intrauterine system
Autor: | Flecken U, Westhoff C, Zahradnik Hp, Henzl Mr, Starr Rm, Lopez Lm, Roy S, Edelman A, Armstrong Ay, Jansen R, Scommegna A, Mumford Sl, Otterness C, Breckwoldt M, Kraut E, Hagenfeldt K, Chen M, Fred A. Kincl, Grey Tw, Hill Mj, Stewart Cj, Harry W. Rudel, Helmerhorst Fm, Bernholc A, Heitmann Rj, Gobburu J, Leake R, Gopalakrishnan M, Creinin |
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Rok vydání: | 2016 |
Předmět: |
Adult
medicine.medical_specialty Time Factors Adolescent Cost effectiveness Coefficient of variation Population Prostaglandin Levonorgestrel Endometrium Young Adult 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Internal medicine Contraceptive Agents Female medicine Humans 030212 general & internal medicine education education.field_of_study Pregnancy 030219 obstetrics & reproductive medicine business.industry Intrauterine Devices Medicated Obstetrics and Gynecology Radioimmunoassay Middle Aged medicine.disease medicine.anatomical_structure Endocrinology Reproductive Medicine chemistry Delayed-Action Preparations Female business medicine.drug |
Zdroj: | Contraception. 94:353-356 |
ISSN: | 0010-7824 |
Popis: | To understand the potential duration of action for Liletta®, we conducted this study to estimate levonorgestrel (LNG) release rates over approximately 5½years of product use.Clinical sites in the U.S. Phase 3 study of Liletta collected the LNG intrauterine systems (IUSs) from women who discontinued the study. We randomly selected samples within 90-day intervals after discontinuation of IUS use through 900days (approximately 2.5years) and 180-day intervals for the remaining duration through 5.4years (1980days) to evaluate residual LNG content. We also performed an initial LNG content analysis using 10 randomly selected samples from a single lot. We calculated the average ex vivo release rate using the residual LNG content over the duration of the analysis.We analyzed 64 samples within 90-day intervals (range 6-10 samples per interval) through 900days and 36 samples within 180-day intervals (6 samples per interval) for the remaining duration. The initial content analysis averaged 52.0±1.8mg. We calculated an average initial release rate of 19.5mcg/day that decreased to 17.0, 14.8, 12.9, 11.3 and 9.8mcg/day after 1, 2, 3, 4 and 5years, respectively. The 5-year average release rate is 14.7mcg/day.The estimated initial LNG release rate and gradual decay of the estimated release rate are consistent with the target design and function of the product. The calculated LNG content and release rate curves support the continued evaluation of Liletta as a contraceptive for 5 or more years of use.Liletta LNG content and release rates are comparable to published data for another LNG 52-mg IUS. The release rate at 5years is more than double the published release rate at 3years with an LNG 13.5-mg IUS, suggesting continued efficacy of Liletta beyond 5years. |
Databáze: | OpenAIRE |
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