Absence of Pharmacokinetic Interactions of the Combined Contraceptive Vaginal Ring NuvaRing® with Oral Amoxicillin or Doxycycline in Two Randomised Trials

Background Two pharmacokinetic studies were performed to investigate whether there is any interaction between etonogestrel or ethinylestradiol released from the combined contraceptive vaginal ring NuvaRing® and concomitant treatment with orally administered amoxicillin or doxycycline.