FDA approves new vaginal ring for one year of birth control
Annovera is a reusable donut-shaped (ring), non-biodegradable, flexible vaginal system that is placed in the vagina for three weeks followed by one week out of the vagina, at which time women may experience a period (a withdrawal bleed). This schedule is repeated every four weeks for one year (thirteen 28-day menstrual cycles).
Annovera is washed and stored in a compact case for the seven days not in use. Annovera does not require refrigeration prior to dispensing and can withstand storage temperatures up to 30°C (86°F).
The efficacy and safety of Annovera were studied in three, open label clinical trials with healthy women ranging from 18 to 40 years of age. Based on the results, about two to four women out of 100 women may get pregnant during the first year they use Annovera.
All hormonal contraception carries serious risks. Annovera carries a boxed warning relating to cigarette smoking and serious cardiovascular events. Women over 35 who smoke should not use Annovera. Cigarette smoking increases the risk of serious cardiovascular events from combination hormonal contraceptive use.
The most common side effects in women using Annovera are similar to those of other combined hormonal contraceptive products and include headache/migraine, nausea/vomiting, yeast infections, abdominal pain, dysmenorrhea (painful menstruation), breast tenderness, irregular bleeding, diarrhea and genital itching.
The FDA is requiring postmarketing studies to further evaluate the risks of venous thromboembolism, and the effects of CYP3A modulating drugs and tampon use on the pharmacokinetics of Annovera. ■