Medical Management of Endometriosis — Hormonal Options

Medical hormonal management is the cornerstone of long-term endometriosis care. This page covers the major drug classes, when each is appropriate, side effect profiles, and how the choice is individualised — aligned with ESHRE 2022 recommendations.

1. Combined oral contraceptive (COC)

First-line for most patients. Continuous (no placebo week) regimen preferred to suppress menstruation entirely. Mechanism — suppresses ovulation, reduces cyclical disease activity, stabilises endometrial lining. Pros — affordable, well-tolerated, contraceptive bonus, no need for special licensing. Cons — thrombosis risk in selected patients (smokers over 35, prior thrombosis, severe migraine with aura), may be insufficient for severe disease.

2. Progestin-only therapy

Norethisterone, dienogest (Visanne), medroxyprogesterone acetate (depot or oral). Mechanism — suppresses endometrium and ovulation without oestrogen exposure. Pros — avoids oestrogen risks, suitable for migraine-with-aura patients, smoking-over-35, thrombosis history. Cons — irregular bleeding (especially early), mood effects, weight gain in some. Dienogest specifically licensed for endometriosis in many countries with strong evidence.

3. Levonorgestrel-releasing intrauterine system (Mirena)

Local progestin release directly to the uterus. Reduces menstrual bleeding by approximately 90 percent within 6 months. Highly effective for endometriosis-associated dysmenorrhoea, particularly with coexisting adenomyosis. Pros — 5–8 year duration of effect, minimal systemic side effects, contraception included. Cons — insertion discomfort, irregular bleeding initially, occasional expulsion.

4. GnRH agonists

Leuprolide, goserelin, triptorelin. Induce pseudo-menopause by suppressing pituitary FSH/LH after initial flare. Highly effective for severe disease, pre-surgical shrinkage, post-surgical recurrence prevention. Pros — powerful suppression. Cons — menopausal side effects (hot flushes, mood, bone density loss). Requires add-back therapy (low-dose oestrogen plus progestin) for use beyond 6 months to protect bone density.

5. GnRH antagonists — newer class

Elagolix, relugolix combinations. Oral, rapid onset, dose-adjustable suppression. Lower-dose options preserve some ovarian function while controlling pain. Pros — oral administration, flexible dosing, less severe menopausal symptoms at lower doses, no add-back needed for shorter courses. Cons — cost, newer (less long-term data than agonists), still some hypoestrogenic effects at full doses.

6. Choosing the agent

First-line for most patients — continuous combined oral contraceptive or Mirena IUS. Second-line — dienogest if first-line is contraindicated or insufficient. Third-line — GnRH antagonists or agonists with add-back for refractory pain. Patient factors (contraception need, age, comorbidities, side effect tolerance, cost) drive choice. Switching agents is common when one fails.

7. Duration of treatment

Endometriosis is chronic. Treatment continues long-term — often until menopause or pregnancy attempts. Breaks for fertility-seeking are planned. Side effects reassessed annually. The aim is sustainable management that controls symptoms without burdensome side effects — perfect adherence is rarely necessary if symptoms are controlled.

8. When medical management is insufficient

Inadequate pain control on adequate hormonal trials (more than one agent tried). Anatomic complications (hydrosalpinx, large endometrioma, deep bowel/bladder/ureter disease). Fertility issues requiring anatomic correction. Significant adenomyosis with completed family. These trigger surgical or IVF planning. Medical management often continues alongside surgery for post-operative recurrence prevention.

Frequently Asked Questions

Dr. Priyadatt Patel

Senior Gynecologist · Advanced Laparoscopic Surgeon · IVF and Endometriosis Programme Lead

MS OBGyn · Pregnancy Care · Advanced Gynaecological Ultrasound · Fertility Preservation

ESHRE / ESGE / AAGL / ASRM guideline-aligned practice. 3D Karl Storz precision technique. Fertility-preservation-first philosophy. Evidence-based decisions, honest counselling, long-term outcomes orientation.