Low-Dose Naltrexone in Combination With Standard Treatment in Women With Endometriosis

  • days left to enroll
  • participants needed
  • sponsor
    Milton S. Hershey Medical Center
Updated on 11 May 2022
surgical diagnosis
norethindrone acetate


The purpose of this study is to determine if the addition of Low Dose Naltrexone to standard endometriosis treatments will improve patient reported endometriosis associated pain.


The central hypothesis of the research study is that low dose naltrexone (LDN), in combination with hormonal suppression of endometriosis (standard of care), will lead to significant improvement of endometriosis-related pain.

The proposal seeks to:

  1. determine if the addition of LDN to standard endometriosis treatments will improve patient- reported endometriosis associated pain using daily Visual Analogue Scale (VAS) scores and
  2. measure the impact of treatment on quality of life as measured by validated questionnaires including the Endometriosis Health Profile-30 (EHP30) and the Patient's Global Impression of Change (PGIC).

Condition Endometriosis
Treatment Placebo, naltrexone, Norethindrone acetate
Clinical Study IdentifierNCT03970330
SponsorMilton S. Hershey Medical Center
Last Modified on11 May 2022


Yes No Not Sure

Inclusion Criteria

Premenopausal female ages 18 to 45 years old on the day of signing informed consent
Must agree to use only study-specific analgesic medications during the study and is not known to be intolerant to them
Diagnosed with endometriosis and has had, within the last 10 years prior to signing the informed consent, surgical diagnosis with direct visualization and/or histopathologic confirmation of endometriosis
Is not expected to undergo gynecological surgery or other surgical procedures for treatment of endometriosis during the study period
Agrees to use contraception if not surgically sterile during the entire study
Patients using oral contraceptives, LARCs and/or GnRH agonists/antagonists for contraception and/or management of endometriosis, with a stable regimen, will be able to continue in the study, however, women using oral contraceptives and GnRH agonist/antagonists will be switched to Norethindrone acetate during the 1-2 week run-in period as prescribed by principle investigator

Exclusion Criteria

Women that are pregnant, breastfeeding or trying to conceive
Patients with chronic daily narcotic use and any chronic pain or frequently reoccurring pain condition, other than endometriosis, that is treated with opioids or requires analgesics for more than 7 days per month
Patients with abnormal liver function tests (greater than 3x normal limit) in the past year or history of liver disease. Routine screening of liver function is not required
Non-English speaking or inability to read and understand English secondary, in part, to the need to read and report daily results in English
Undiagnosed vaginal bleeding
Patients with history of opioid, illicit drug or alcohol abuse
Patients currently taking thioridazine
Patients with a history of suicidality
Patients with current or history of unstable depression or other psychiatric disorder who, by PI judgement, are unstable or not well controlled
Known, suspected or history of cancer of the breast
Active deep vein thrombosis, pulmonary embolism or history of these conditions
Active or recent arterial thromboembolic disease (e.g., stroke, myocardial infarction)
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