Menstrual bleeding patterns in adolescents using etonogestrel (ENG) implant

Etonogestrel (ENG) implant is an effective method of contraception. The implant is designed to provide contraceptive efficacy for 3 years with a relatively quick return of fertility upon its removal. Menstrual irregularities are not uncommon on long-acting progestins and can often be the factor for discontinuation or removal. A retrospective chart analysis was done on 58 patients who chose to be on the ENG implant. Age ranged from 12 to 24 years. The cycle ranged from 1 to 17 months. The mean length of use of the implant was 10.9 months. Over the 20-month period, 13 ENG implants were removed because of menstrual bleeding problems.

We conducted a chart review of the adolescent patients who received the ENG implant in our adolescent clinic. An analysis was done based on symptoms experienced by patients who were on the ENG implant and their management, which in some cases resulted in its removal.

The data is presented on adolescent and young adult patients who receive their reproductive care in the Adolescent Medicine Clinic at the University of Kentucky, Lexington, KY, USA.

ENG implant when used correctly and as indicated is extremely effective in providing contraception for up to 3 years. However, menstrual irregularities can be very troublesome and often a reason for its removal. In our experience, 22.4% (13 out of the 58 subjects) had menstrual problems post-insertion that led to its removal. It is crucial for a clinician to inform and be informed about such side effects.