Dienogest or Hormonal IUD?Four Adenomyosis Trial Checks

NICE’s¹ UK guidance recommends considering a levonorgestrel intrauterine system, or LNG-IUS, first for heavy bleeding with suspected or diagnosed adenomyosis. A comparison with oral dienogest needs attention to the symptom being measured and the treatment timeframe.¹

Check the diagnosis and population

A single-center Indian trial randomized 74 women with imaging-diagnosed adenomyosis to Mirena 52 mg or dienogest 2 mg daily. Only 68 were analyzed at 12 weeks. Women wishing for future pregnancy were excluded; hemoglobin below 8 g/dL required correction before recruitment.²

Start with the pain result

Pain was the primary outcome. Average pain scores fell from 6.41 to 3.41 with the IUD and 6.41 to 3.12 with dienogest, on a 0–10 scale. The between-group improvement did not differ significantly. This small, open-label trial did not establish identical effects.²

Twelve weeks is also shorter than NICE’s¹ advice to allow at least six cycles to see LNG-IUS benefits. It warns that bleeding changes can last longer than six months. Ask when the clinician will assess pain, bleeding and tolerability separately.¹

Read bleeding and quality-of-life results

Lighter bleeding was reported by 27/30 IUD users versus 17/22 dienogest users who initially had heavy bleeding. This was a subjective rating, not measured milliliters. Quality of life favored dienogest on a secondary outcome. The authors reported no financial support or conflicts.²

Ask whether the result being quoted concerns pain, a bleeding category or a questionnaire score. Our adenomyosis assessment notes help organize the symptoms for review.

Check the product, bleeding risk and contraception

The current UK Dimetrum 2 mg dienogest label lists endometriosis as its indication. Adenomyosis use falls outside that indication. Ask which formulation is available and licensed where you receive care.³

The label specifically warns that bleeding with adenomyosis can worsen and, if heavy and continuous, cause potentially severe anemia. It also says dienogest is not a contraceptive and recommends nonhormonal contraception when needed. Discuss pregnancy plans and the plan for persistent bleeding before starting.³

NICE¹ recommends a full blood count for heavy menstrual bleeding alongside treatment. Ask how blood results and bleeding changes will affect follow-up, rather than waiting for a routine review if symptoms worsen.¹

Period, Handled describes a Period Scorecard covering product changes, night changes, pain scores and what pain prevented. Bring those dated notes and previous treatment details to the appointment. See the book.