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Worldwide method effectiveness of the Today® vaginal contraceptive sponge

  • Published:
Advances in Contraception

Abstract

The Today® vaginal contraceptive sponge is made of polyurethane and contains 1 gram of the spermicide nonoxynol-9. Following preclinical and phase I and II clinical trials, extensive worldwide phase III trials were conducted. These multiclinic trials were conducted according to a common protocol with regularly scheduled follow-up visits and examinations. The cumulative first year method effectiveness rate (life table) was 90 per 100 women. The second year rate was 97 per 100 women.

No statistically significant difference was found in method failures between nulliparous and parous women. No serious complications occurred in over 1000 women-years of sponge use.

Resumé

L'éponge contraceptive vaginale Today® est en polyuréthane et contient 1 gramme du spermicide nonoxynol-9. Suite aux essais pré-cliniques et cliniques des phases I et II, on a entrepris des essais très poussés dans le monde entier dans le cadre de la phase III. Ces essais multicliniques ont été réalisés selon un protocole commun, et accompagnés de visites et d'examens de contrôle réguliers. Le taux d'efficacité cumulatif pour la première année (calculé par la méthode des tables de survie) a atteint 90/100 femmes, et 97/100 femmes pour la seconde année.

On n'a découvert aucune différence appréciable au point de vue statistique entre les nullipares et les femmes ayant eu un ou plusieurs enfants. Aucune complication grave n'est survenue durant plus de 1000 femmes-années d'emploi de l'éponge.

Resumen

La esponja vaginal anticonceptive Today® está hecha de poliuretano y contiene un gramo de espermicida nonoxinol-9. Se efectuaron extensas pruebas de fase III en todo el mundo despues de haber hecho pruebas preclínicas y clínicas de fase I y II. Estas pruebas multiclínicas fueron hechas de acuerdo a un protocolo comun, con citas de seguimiento y exámenes. La tasa cumulativa del primer año de efectividad del método (tabla de vida) fué de 90 por 100 mujeres. En el segundo año la tasa fué de 97 por 100 mujeres.

No se encontró una diferencia estadísticamente significativa en los fracasos del método entre mujeres nulíparas y paras. No hubo complicaciones serias en mas de 1000 mujeres-año de uso de esta espanja.

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References

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McClure, D.A., Edelman, D.A. Worldwide method effectiveness of the Today® vaginal contraceptive sponge. Adv Contracept 1, 305–311 (1985). https://doi.org/10.1007/BF01849305

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