Does Kyleena Cause Amenorrhea?
Yes, Kyleena (levonorgestrel 52 mg intrauterine system) does cause amenorrhea in a significant proportion of users, with rates increasing progressively over time from approximately 12% at one year to 23% by five years of use. 1
Amenorrhea Rates Over Time
The FDA-approved labeling for Kyleena provides clear data on amenorrhea development:
- First 90 days: <1% of users experience amenorrhea 1
- Second 90 days (days 91-180): 5% develop amenorrhea 1
- End of Year 1: 12% of users have amenorrhea 1
- End of Year 3: 20% experience amenorrhea 1
- End of Year 5: 23% have amenorrhea 1
Clinical Context and Counseling Points
Amenorrhea with Kyleena is a normal physiologic response to the levonorgestrel, not a medical concern, and does not require intervention unless the patient desires removal. 1
Key counseling considerations:
- Most users do NOT develop amenorrhea in the first year - approximately 80-88% will continue to have some bleeding 2
- Amenorrhea rates are lower with Kyleena (13.5 mg levonorgestrel) compared to higher-dose LNG-IUS products - the 52 mg levonorgestrel IUS shows amenorrhea rates of approximately 16-18% at one year versus 12% with Kyleena 3, 4
- Irregular bleeding is more common than amenorrhea with Kyleena - 43% experience irregular bleeding in the first 90 days, decreasing to 9% by year 5 1
Predictors of Amenorrhea
The only clinically useful predictor of amenorrhea at 12 months is baseline menstrual flow duration of less than 7 days, which increases the likelihood of amenorrhea approximately 3.7-fold 4. Other factors including age, parity, race, BMI, and prior hormonal contraception use do NOT reliably predict amenorrhea development 4.
Management Considerations
If amenorrhea develops, pregnancy testing is only necessary if menstruation does not occur within 6 weeks of the previous menstruation; once pregnancy is excluded, repeated testing is not needed unless other signs of pregnancy or pelvic pain develop. 1
Important clinical pitfalls:
- Do NOT discontinue Kyleena solely for amenorrhea - no participants in clinical trials discontinued specifically for amenorrhea, though 4.8% discontinued for other bleeding complaints 1
- Amenorrhea is NOT a contraindication to continued use and is associated with high patient satisfaction 5
- An increase in menstrual bleeding after a period of amenorrhea may indicate IUD expulsion and warrants evaluation 1
Comparison to Other Bleeding Patterns
While amenorrhea affects 12-23% of users over time, other bleeding patterns are more common with Kyleena: