A 35-year-old woman with severe endometriosis and dysmenorrhoea, unresponsive to NSAIDs, requires hormonal treatment. She has no contraindications to estrogen or progestins. Which is the drug of choice for management of her endometriosis?

Explanation

## Endometriosis Management: First-Line Hormonal Therapy **Key Point:** The levonorgestrel intrauterine device (LNG-IUD / Mirena) is the preferred first-line hormonal treatment for endometriosis-related pain, offering high efficacy with minimal systemic side effects. ### Why LNG-IUD is Drug of Choice **High-Yield:** The LNG-IUD provides: 1. **Local progestin delivery** — high intrauterine progestin concentration suppresses endometrial proliferation 2. **Minimal systemic absorption** — avoids systemic hormonal side effects 3. **Long duration** — effective for 5–7 years, improving compliance 4. **Superior pain relief** — reduces dysmenorrhoea and chronic pelvic pain in endometriosis 5. **Dual benefit** — contraception + treatment **Clinical Pearl:** The LNG-IUD is now recommended as **first-line** by major guidelines (ASRM, ESHRE) for endometriosis-related pain, surpassing older agents like danazol and GnRH agonists as initial therapy. ### Comparison of Endometriosis Treatments | Agent | Mechanism | Efficacy | Side Effects | First-Line? | |-------|-----------|----------|--------------|-------------| | **LNG-IUD** | Local progestin | Excellent for pain | Minimal systemic | **YES** | | Norethisterone acetate | Systemic progestin | Good | Weight gain, mood changes | No — second-line | | DMPA (Medroxyprogesterone) | Systemic progestin | Good | Amenorrhoea, weight gain | No — second-line | | Danazol | Androgen derivative | Good | Virilization, lipid changes | **NO** — outdated, poor tolerability | | GnRH agonists | Suppress FSH/LH | Excellent | Hypoestrogenaemia, bone loss | No — reserved for severe cases | **Mnemonic:** **LNGID** = **L**evonorgestrel **N**orgestrel **G**estation **I**ntrauterine **D**evice — remember it as the first-line for endometriosis pain. ### Treatment Algorithm ```mermaid flowchart TD A[Endometriosis with dysmenorrhoea]:::outcome --> B{First-line treatment?}:::decision B -->|Hormonal preferred| C[LNG-IUD]:::action B -->|Hormonal alternative| D[Norethisterone acetate or DMPA]:::action B -->|Non-hormonal| E[NSAIDs, surgery]:::action C --> F[Excellent pain relief, 5-7 year duration]:::outcome D --> G[Good efficacy but more systemic side effects]:::outcome ``` [cite:KD Tripathi 8e Ch 62]