Elagolix: what it treats, how to take it, side effects
Last updated September 3, 2026.
Elagolix (brand name Orilissa) is a daily pill for moderate to severe pain from endometriosis. It lowers estrogen production by blocking GnRH signaling, which quiets the endometrial tissue that drives the pain, and treatment length is capped to protect your bones.
What does it treat?
It treats the pain of endometriosis: painful periods, pain between periods, and pain with sex. It is not a cure and not a contraceptive; it manages pain while you take it, and symptoms often return after stopping. It is for people who have a diagnosis of endometriosis and whose pain is moderate to severe.
How do you take it?
There are two schedules: 150 mg once daily for up to 24 months, or 200 mg twice daily for up to 6 months. The higher dose controls pain faster but suppresses estrogen harder, which is why its window is shorter. With moderate liver impairment, only the 150 mg dose is allowed, for up to 6 months, and with severe liver impairment it should not be used at all. Take it at the same times daily. Missed dose: take it the same day as soon as you remember, never double up. You will also need a reliable non-hormonal birth control method during treatment and for 1 week after the last dose, because elagolix can make hormonal contraceptives less reliable and can harm a pregnancy.
Side effects to know
- Common: hot flashes, night sweats, headache, nausea, insomnia, absent periods, anxiety, joint pain, and mood changes, essentially a temporary, partial menopause for many users.
- Serious: bone loss that grows with duration and dose (the reason for the time caps), liver enzyme elevations, suicidal thoughts and worsening of mood disorders, and changed bleeding patterns that can mask a pregnancy.
Who should not take it?
Do not take elagolix if you are pregnant or might be; a pregnancy test comes before starting. Severe liver disease rules it out, and osteoporosis calls for caution because of bone loss. Tell your prescriber about any history of depression, anxiety, or suicidal thinking, and every medicine you take, since interactions are common. It is not for children.
When is it an emergency?
If thoughts of harming or killing yourself appear while taking elagolix, call or text 988 (the Suicide and Crisis Lifeline in the US) immediately, or your local crisis line elsewhere, and contact your prescriber. Yellowing skin or eyes, severe abdominal pain, or fainting also warrant urgent care. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
Why is there a time limit on elagolix?
Bone loss. Suppressing estrogen thins bone the longer and deeper you suppress it, so the label caps 150 mg once daily at 24 months and 200 mg twice daily at 6 months. Your doctor may check bone density and weigh add-back therapy if longer control is needed.
Will elagolix stop my period?
Often, yes, especially at the 200 mg dose, and reduced or absent periods are expected, not harmful. The flip side matters too: because bleeding stops being a reliable signal, you can miss a pregnancy, which is one more reason the non-hormonal contraception rule is strict.
Does elagolix cause menopause symptoms?
A partial, temporary version. Hot flashes, night sweats, insomnia, and mood changes are its most common side effects because they come from the estrogen lowering itself. They reverse after stopping. The 150 mg dose trades some symptom control for milder versions of these.
What is add-back therapy?
Adding a small amount of hormone (usually a progestin, sometimes with estrogen) alongside elagolix to protect bone and blunt the menopause-like symptoms while keeping pain control. Some clinicians start it from day one; it is a reasonable thing to ask about when the prescription is written.
Why can't I rely on the pill while taking elagolix?
Two reasons. Elagolix can reduce the effectiveness of some hormonal contraceptives, and hormonal contraceptives can interfere with elagolix. MedlinePlus directs a reliable non-hormonal method, like condoms or a copper IUD, during treatment and for 1 week after the last dose.
How fast does elagolix relieve endometriosis pain?
In trials, many patients reported meaningful relief of painful periods and daily pelvic pain within the first 3 months, with the 200 mg dose acting faster. If several months pass with no benefit, continuing it adds bone risk without payoff, so that is a reassessment point.