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Elagolix: Drug information

Elagolix: Drug information
(For additional information see "Elagolix: Patient drug information")

For abbreviations, symbols, and age group definitions used in Lexicomp (show table)
Brand Names: US
  • Orilissa
Brand Names: Canada
  • Orilissa
Pharmacologic Category
  • Gonadotropin Releasing Hormone Antagonist
Dosing: Adult

Note: To minimize bone loss, use the lowest effective dose and do not exceed recommended treatment durations. Exclude pregnancy before initiation or initiate within 7 days of menses.

Endometriosis-associated pain, moderate to severe

Endometriosis-associated pain, moderate to severe: Note: For the management of moderate to severe symptoms or for patients who do not respond to nonsteroidal anti-inflammatory drugs, hormonal contraceptives, or progestins (Ref). Oral: 150 mg once daily for a maximum duration of 24 months; for severe symptoms (eg, dyspareunia), may increase to 200 mg twice daily for a maximum duration of 6 months.

Missed dose: Administer missed dose on the same day as soon as remembered and then resume the regular schedule. For patients taking 150 mg once daily, do not exceed 150 mg per day; for patients taking 200 mg twice daily, do not exceed 400 mg per day.

Dosage adjustment for concomitant therapy: Significant drug interactions exist, requiring dose/frequency adjustment or avoidance. Consult drug interactions database for more information.

Dosing: Kidney Impairment: Adult

Mild, moderate, or severe impairment: No dosage adjustment necessary.

ESRD: No dosage adjustment necessary.

Dosing: Hepatic Impairment: Adult

Mild impairment (Child-Turcotte-Pugh class A): No dosage adjustment necessary.

Moderate impairment (Child-Turcotte-Pugh class B): Initial dose: 150 mg once daily for a maximum treatment duration of 6 months. The 200 mg twice daily dose is not recommended.

Severe impairment (Child-Turcotte-Pugh class C): Use is contraindicated.

Adverse Reactions

The following adverse drug reactions and incidences are derived from product labeling unless otherwise specified.

>10%:

Endocrine & metabolic: Amenorrhea (4% to 57%; dose-dependent), hot flash (24% to 46%)

Gastrointestinal: Nausea (16%)

Nervous system: Headache (17% to 20%)

Neuromuscular & skeletal: Decreased bone mineral density (≤21%; dose-dependent)

1% to 10%:

Endocrine & metabolic: Decreased libido (3% to <5%), weight gain (3% to <5%)

Gastrointestinal: Abdominal pain (3% to <5%), constipation (3% to <5%), diarrhea (3% to <5%)

Hepatic: Increased serum alanine aminotransferase (≥3 x ULN: 1%; dose-dependent)

Nervous system: Anxiety (5%), depressed mood (≤6%), depression (≤6%), dizziness (3% to <5%), emotional lability (≤6%; including tearfulness), insomnia (6% to 9%), irritability (3% to <5%), mood changes (≤6%)

Neuromuscular & skeletal: Arthralgia (5%)

<1%:

Gastrointestinal: Appendicitis

Nervous system: Suicidal ideation, suicidal tendencies

Neuromuscular & skeletal: Back pain

Frequency not defined:

Dermatologic: Night sweats

Endocrine & metabolic: Increased HDL cholesterol (dose-dependent), increased LDL cholesterol (dose-dependent), increased serum cholesterol (dose-dependent), increased triglycerides (dose-dependent)

Genitourinary: Menstruation (dose-dependent; reduction in the amount, intensity, or duration of menstrual bleeding)

Postmarketing: Hypersensitivity: Anaphylaxis, angioedema, hypersensitivity reaction

Contraindications

Hypersensitivity to elagolix or any component of the formulation; pregnancy; known osteoporosis; severe hepatic impairment (Child-Turcotte-Pugh class C); concomitant use of organic anion transporting polypeptide (OATP) 1B1 that are known or expected to significantly increase elagolix plasma concentrations.

Significant drug interactions exist, requiring dose/frequency adjustment or avoidance. Consult drug interactions database for more information.

Canadian labeling: Additional contraindications (not in US labeling): Undiagnosed vaginal bleeding

Warnings/Precautions

Concerns related to adverse effects:

• Bleeding irregularities: Menstrual bleeding patterns may change, causing a decrease in the amount, intensity, or duration of bleeding. Changes in bleeding patterns may alter the ability to detect pregnancy. Conduct pregnancy testing if pregnancy is suspected; discontinue use if pregnancy is confirmed.

• BMD loss: A dose-dependent decrease in BMD is associated with elagolix exposure. The risk of BMD loss is increased with duration of use and may not be completely reversible following discontinuation of elagolix. Evaluate patients for osteoporosis risk factors (including a history of low-trauma fracture) prior to therapy. Consider supplementation with calcium and vitamin D. Limit duration of treatment to prevent BMD loss.

• Depression: Elagolix may increase the risk of depression and mood changes; risk may be increased in patients with a history of suicidality or depression. Suicidal ideation/behavior has been reported. Promptly evaluate new or worsening psychiatric symptoms and refer to a mental health care professional if appropriate. Patients should seek immediate medical attention for suicidal ideation and behavior. Consider risks and benefits of therapy if mood disturbances occur.

• Hepatic impairment: Dose-dependent elevations of ALT ≥3 times the upper limit of normal may occur; use the lowest effective dose. Promptly evaluate elevations in transaminases to assess risks versus benefits of continuing therapy. Dose adjustment is required in patients with moderate hepatic impairment; do not use in severe hepatic impairment.

Dosage Forms: US

Excipient information presented when available (limited, particularly for generics); consult specific product labeling.

Tablet, Oral:

Orilissa: 150 mg [contains carmine]

Orilissa: 200 mg

Generic Equivalent Available: US

No

Pricing: US

Tablets (Orilissa Oral)

150 mg (per each): $49.45

200 mg (per each): $24.73

Disclaimer: A representative AWP (Average Wholesale Price) price or price range is provided as reference price only. A range is provided when more than one manufacturer's AWP price is available and uses the low and high price reported by the manufacturers to determine the range. The pricing data should be used for benchmarking purposes only, and as such should not be used alone to set or adjudicate any prices for reimbursement or purchasing functions or considered to be an exact price for a single product and/or manufacturer. Medi-Span expressly disclaims all warranties of any kind or nature, whether express or implied, and assumes no liability with respect to accuracy of price or price range data published in its solutions. In no event shall Medi-Span be liable for special, indirect, incidental, or consequential damages arising from use of price or price range data. Pricing data is updated monthly.

Dosage Forms: Canada

Excipient information presented when available (limited, particularly for generics); consult specific product labeling.

Tablet, Oral:

Orilissa: 150 mg [contains carmine]

Orilissa: 200 mg

Administration: Adult

Oral: Administer at approximately the same time(s) each day, with or without food. Exclude pregnancy before initiation or initiate within 7 days of menses.

Hazardous Drugs Handling Considerations

This medication is not on the NIOSH (2016) list; however, it may meet the criteria for a hazardous drug. Elagolix may cause reproductive toxicity and has a structural or toxicity profile similar to existing hazardous agents. Assess risk to determine appropriate containment strategy (USP-NF 2017).

Use appropriate precautions for receiving, handling, administration, and disposal. Gloves (single) should be worn during receiving, unpacking, and placing in storage. NIOSH recommends single gloving for administration of intact tablets or capsules (NIOSH 2016).

Medication Guide and/or Vaccine Information Statement (VIS)

An FDA-approved patient medication guide, which is available with the product information and at https://www.accessdata.fda.gov/drugsatfda_docs/label/2023/210450s009lbl.pdf#page=27, must be dispensed with this medication.

Use: Labeled Indications

Endometriosis-associated pain, moderate to severe: Management of moderate to severe pain associated with endometriosis.

Limitation of use: Limit use based on dose and coexisting conditions.

Medication Safety Issues
Sound-alike/look-alike issues:

Elagolix may be confused with cetrorelix, degarelix, ganirelix

Orilissa may be confused with orlistat

High alert medication:

The Institute for Safe Medication Practices (ISMP) includes this medication among its list of drugs that have a heightened risk of causing significant patient harm when used in error.

Metabolism/Transport Effects

Substrate of CYP3A4 (major), OATP1B1/1B3 (SLCO1B1/1B3), P-glycoprotein/ABCB1 (minor); Note: Assignment of Major/Minor substrate status based on clinically relevant drug interaction potential; Inhibits CYP2C19 (weak), P-glycoprotein/ABCB1; Induces CYP3A4 (weak)

Drug Interactions

Note: Interacting drugs may not be individually listed below if they are part of a group interaction (eg, individual drugs within “CYP3A4 Inducers [Strong]” are NOT listed). For a complete list of drug interactions by individual drug name and detailed management recommendations, use the Lexicomp drug interactions program by clicking on the “Launch drug interactions program” link above.

Afatinib: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Afatinib. Management: If combined, administer the P-gp inhibitor simultaneously with, or after, the dose of afatinib. Monitor closely for signs and symptoms of afatinib toxicity and if the combination is not tolerated, reduce the afatinib dose by 10 mg. Risk D: Consider therapy modification

Aliskiren: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Aliskiren. Risk C: Monitor therapy

Asciminib: May increase the serum concentration of OATP1B1/1B3 (SLCO1B1/1B3) Substrates (Clinically Relevant with Inhibitors). Risk C: Monitor therapy

Atogepant: CYP3A4 Inducers (Weak) may decrease the serum concentration of Atogepant. Management: For treatment of episodic migraine, the recommended dose of atogepant is 30 mg once daily or 60 mg once daily when combined with CYP3A4 inducers. When used for treatment of chronic migraine, use of atogepant with CYP3A4 inducers should be avoided. Risk D: Consider therapy modification

Berotralstat: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Berotralstat. Management: Decrease the berotralstat dose to 110 mg daily when combined with P-glycoprotein (P-gp) inhibitors. Risk D: Consider therapy modification

Bilastine: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Bilastine. Risk X: Avoid combination

CarBAMazepine: CYP3A4 Inducers (Weak) may decrease the serum concentration of CarBAMazepine. Risk C: Monitor therapy

Celiprolol: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Celiprolol. Risk C: Monitor therapy

CloBAZam: CYP2C19 Inhibitors (Weak) may increase serum concentrations of the active metabolite(s) of CloBAZam. CYP2C19 Inhibitors (Weak) may increase the serum concentration of CloBAZam. Risk C: Monitor therapy

Clofazimine: May increase the serum concentration of CYP3A4 Substrates (High risk with Inhibitors). Risk C: Monitor therapy

CloZAPine: CYP3A4 Inducers (Weak) may decrease the serum concentration of CloZAPine. Risk C: Monitor therapy

Colchicine: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Colchicine. Colchicine distribution into certain tissues (e.g., brain) may also be increased. Management: This combination is often contraindicated, but combined use may be permitted with dose adjustment and monitoring. Recommendations vary based on brand, indication, use of CYP3A4 inhibitors, and hepatic/renal function. See interaction monograph for details. Risk D: Consider therapy modification

CYP3A4 Inducers (Strong): May decrease the serum concentration of Elagolix. Risk C: Monitor therapy

CYP3A4 Inhibitors (Strong): May increase the serum concentration of Elagolix. Management: Use of the elagolix 200 mg twice daily dose with a strong CYP3A4 inhibitor for longer than 1 month is not recommended. Limit combined use of the elagolix 150 mg once daily dose with a strong CYP3A4 inhibitor to a maximum of 6 months. Risk D: Consider therapy modification

Dabigatran Etexilate: P-glycoprotein/ABCB1 Inhibitors may increase serum concentrations of the active metabolite(s) of Dabigatran Etexilate. Risk C: Monitor therapy

Digoxin: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Digoxin. Management: Measure digoxin serum concentrations before initiating treatment with these P-glycoprotein (P-gp) inhibitors. Reduce digoxin concentrations by either reducing the digoxin dose by 15% to 30% or by modifying the dosing frequency. Risk D: Consider therapy modification

DOXOrubicin (Conventional): P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of DOXOrubicin (Conventional). Risk X: Avoid combination

DOXOrubicin (Liposomal): P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of DOXOrubicin (Liposomal). Risk C: Monitor therapy

Edoxaban: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Edoxaban. Risk C: Monitor therapy

Etoposide: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Etoposide. Risk C: Monitor therapy

Etoposide Phosphate: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Etoposide Phosphate. Risk C: Monitor therapy

Everolimus: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Everolimus. Risk C: Monitor therapy

Fexinidazole: May increase the serum concentration of CYP3A4 Substrates (High risk with Inhibitors). Risk X: Avoid combination

Fosphenytoin-Phenytoin: May decrease the serum concentration of Elagolix. Elagolix may increase the serum concentration of Fosphenytoin-Phenytoin. Risk C: Monitor therapy

Fusidic Acid (Systemic): May increase the serum concentration of CYP3A4 Substrates (High risk with Inhibitors). Risk X: Avoid combination

Hormonal Contraceptives: May diminish the therapeutic effect of Elagolix. Specifically, estrogen-containing hormonal contraceptives may diminish the therapeutic effects of elagolix. Elagolix may decrease the serum concentration of Hormonal Contraceptives. Specifically, concentrations of progestins may be decreased with elagolix therapy. Elagolix may increase the serum concentration of Hormonal Contraceptives. Specifically, concentrations of ethinyl estradiol may be increased with elagolix therapy. Management: Use an alternative, nonhormonal contraceptive during treatment with elagolix and for at least 28 days following discontinuation of elagolix treatment. Use of elagolix 200 mg twice daily with an estrogen-containing hormonal contraceptive is not recommended Risk D: Consider therapy modification

Lapatinib: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Lapatinib. Risk C: Monitor therapy

Larotrectinib: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Larotrectinib. Risk C: Monitor therapy

Lefamulin: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Lefamulin. Management: Avoid concomitant use of lefamulin tablets with P-glycoprotein/ABCB1 inhibitors. If concomitant use is required, monitor for lefamulin adverse effects. Risk D: Consider therapy modification

Leniolisib: May increase the serum concentration of OATP1B1/1B3 (SLCO1B1/1B3) Substrates (Clinically Relevant with Inhibitors). Risk X: Avoid combination

Mavacamten: CYP2C19 Inhibitors (Weak) may increase the serum concentration of Mavacamten. Management: Start mavacamten at 5 mg/day if stable on a weak CYP2C19 inhibitor. For those stable on mavacamten who are initiating a weak CYP2C19 inhibitor, reduce mavacamten dose by one dose level. Risk D: Consider therapy modification

Morphine (Systemic): P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Morphine (Systemic). Risk C: Monitor therapy

Nadolol: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Nadolol. Risk C: Monitor therapy

Naldemedine: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Naldemedine. Risk C: Monitor therapy

Naloxegol: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Naloxegol. Risk C: Monitor therapy

NiMODipine: CYP3A4 Inducers (Weak) may decrease the serum concentration of NiMODipine. Risk C: Monitor therapy

OATP1B1/1B3 (SLCO1B1/1B3) Inhibitors: May increase the serum concentration of Elagolix. Risk X: Avoid combination

PAZOPanib: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of PAZOPanib. Risk X: Avoid combination

Pralsetinib: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Pralsetinib. Management: If this combo cannot be avoided, decrease pralsetinib dose from 400 mg daily to 300 mg daily; from 300 mg daily to 200 mg daily; and from 200 mg daily to 100 mg daily. Risk D: Consider therapy modification

Pretomanid: May increase the serum concentration of OATP1B1/1B3 (SLCO1B1/1B3) Substrates (Clinically Relevant with Inhibitors). Risk C: Monitor therapy

Ranolazine: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Ranolazine. Risk C: Monitor therapy

Relugolix: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Relugolix. Management: Avoid coadministration of relugolix with oral P-gp inhibitors whenever possible. If combined, take relugolix at least 6 hours prior to the P-gp inhibitor and monitor patients more frequently for adverse reactions. Risk D: Consider therapy modification

Relugolix, Estradiol, and Norethindrone: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Relugolix, Estradiol, and Norethindrone. Management: Avoid use of relugolix/estradiol/norethindrone with P-glycoprotein (P-gp) inhibitors. If concomitant use is unavoidable, relugolix/estradiol/norethindrone should be administered at least 6 hours before the P-gp inhibitor. Risk D: Consider therapy modification

Repotrectinib: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Repotrectinib. Risk X: Avoid combination

RifAMPin: May increase the serum concentration of Elagolix. Management: Use of the elagolix 200 mg twice daily dose with rifampin is not recommended. Limit combined use of the elagolix 150 mg once daily dose with rifampin to a maximum of 6 months. Risk D: Consider therapy modification

RifAXIMin: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of RifAXIMin. Risk C: Monitor therapy

Rimegepant: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Rimegepant. Management: Avoid administration of another dose of rimegepant within 48 hours if given concomitantly with a P-glycoprotein (P-gp) inhibitor. Risk D: Consider therapy modification

RisperiDONE: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of RisperiDONE. Risk C: Monitor therapy

RomiDEPsin: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of RomiDEPsin. Risk C: Monitor therapy

Rosuvastatin: Elagolix may decrease the serum concentration of Rosuvastatin. Risk C: Monitor therapy

Selpercatinib: CYP3A4 Inducers (Weak) may decrease the serum concentration of Selpercatinib. Risk C: Monitor therapy

Silodosin: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Silodosin. Risk C: Monitor therapy

Sirolimus (Conventional): P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Sirolimus (Conventional). Management: Avoid concurrent use of sirolimus with P-glycoprotein (P-gp) inhibitors when possible and alternative agents with lesser interaction potential with sirolimus should be considered. Monitor for increased sirolimus concentrations/toxicity if combined. Risk D: Consider therapy modification

Sirolimus (Protein Bound): P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Sirolimus (Protein Bound). Risk X: Avoid combination

Tacrolimus (Systemic): CYP3A4 Inducers (Weak) may decrease the serum concentration of Tacrolimus (Systemic). Risk C: Monitor therapy

Tacrolimus (Systemic): P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Tacrolimus (Systemic). Risk C: Monitor therapy

Talazoparib: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Talazoparib. Risk C: Monitor therapy

Tegaserod (Withdrawn from US Market): P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Tegaserod (Withdrawn from US Market). Risk C: Monitor therapy

Teniposide: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Teniposide. Risk C: Monitor therapy

Tenofovir Disoproxil Fumarate: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Tenofovir Disoproxil Fumarate. Risk C: Monitor therapy

Topotecan: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Topotecan. Risk X: Avoid combination

Trofinetide: May increase the serum concentration of OATP1B1/1B3 (SLCO1B1/1B3) Substrates (Clinically Relevant with Inhibitors). Management: Avoid concurrent use with OATP1B1/1B3 substrates for which small changes in exposure may be associated with serious toxicities. Monitor for evidence of an altered response to any OATP1B1/1B3 substrate if used together with trofinetide. Risk D: Consider therapy modification

Ubrogepant: CYP3A4 Inducers (Weak) may decrease the serum concentration of Ubrogepant. Management: Use an initial ubrogepant dose of 100 mg and second dose (if needed) of 100 mg when used with a weak CYP3A4 inducer. Risk D: Consider therapy modification

Ubrogepant: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Ubrogepant. Management: Use an initial ubrogepant dose of 50 mg and second dose (at least 2 hours later if needed) of 50 mg when used with a P-gp inhibitor. Risk D: Consider therapy modification

Venetoclax: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Venetoclax. Management: Reduce the venetoclax dose by at least 50% in patients requiring concomitant treatment with P-glycoprotein (P-gp) inhibitors. Resume the previous venetoclax dose 2 to 3 days after discontinuation of a P-gp inhibitor. Risk D: Consider therapy modification

VinCRIStine (Liposomal): P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of VinCRIStine (Liposomal). Risk X: Avoid combination

Voclosporin: May increase the serum concentration of OATP1B1/1B3 (SLCO1B1/1B3) Substrates (Clinically Relevant with Inhibitors). Risk C: Monitor therapy

Reproductive Considerations

Evaluate pregnancy status prior to use. Exclude pregnancy prior to treatment or start elagolix within 7 days from the onset of menses. Treatment with elagolix may reduce the amount, intensity, or duration of menstrual bleeding, which may make it more difficult to recognize pregnancy. Perform pregnancy testing if pregnancy is suspected during elagolix therapy.

Ovulation is not fully suppressed during elagolix therapy (Taylor 2017). Use of hormonal contraception may be associated with increased adverse events, decreased contraceptive efficacy, or decreased efficacy of elagolix; consult drug interactions database for more detailed information related to elagolix and specific contraceptives. Nonhormonal contraceptives should be used during therapy and for 28 days after elagolix treatment is discontinued.

Pregnancy Considerations

Outcome data related to inadvertent exposure in pregnancy are limited. Elagolix may increase the risk of early pregnancy loss. Discontinue elagolix if pregnancy occurs during treatment. Use of elagolix is contraindicated during pregnancy.

Data collection to monitor pregnancy and infant outcomes following exposure to elagolix is ongoing. Health care providers are encouraged to enroll patients exposed to elagolix during pregnancy in the pregnancy registry (833-782-7241 or www.bloompregnancyregistry.com). Patients may also enroll themselves.

Breastfeeding Considerations

It is not known if elagolix is present in breast milk.

According to the manufacturer, the decision to breastfeed during therapy should consider the risk of infant exposure, the benefits of breastfeeding to the infant, and benefits of treatment to the mother.

Dietary Considerations

Consider calcium and vitamin D supplementation.

Monitoring Parameters

Pregnancy status prior to therapy; pregnancy test during therapy (if pregnancy is suspected); liver function tests; monitor mental status (for signs/symptoms of depression, suicidal ideation); consider BMD after 12 months (Surrey 2018)

Mechanism of Action

Elagolix is a short-acting, nonpeptide, gonadotropin-releasing hormone antagonist that suppresses pituitary and ovarian hormone function in a dose-dependent manner. Concentrations of LH, FSH, and estradiol are decreased during therapy and rapidly return to previous levels once treatment is discontinued. In patients with endometriosis, these actions reduce dysmenorrhea and nonmenstrual pelvic pain (Ng 2017; Struthers 2009; Taylor 2017).

Pharmacokinetics (Adult Data Unless Noted)

Note: The pharmacokinetics of elagolix are not influenced by BMI.

Onset: FSH, LH, and estradiol suppression: Within hours of day 1 (initial) administration (Ng 2017)

Duration: FSH, LH, and estradiol concentrations return to baseline or higher within 24 to 48 hours after discontinuation (Ng 2017)

Absorption: Rapid (Ng 2017)

Protein binding: 80%; to human plasma proteins

Metabolism: Hepatic via CYP3A (major pathway) and CYP2D6, CYP2C8, and UGTs

Half-life elimination: Terminal: 4 to 6 hours

Time to peak: 1 hour

Excretion: Feces 90%; urine <3%

Pharmacokinetics: Additional Considerations (Adult Data Unless Noted)

Hepatic function impairment: Exposure of elagolix is increased by ~3-fold in patients with moderate hepatic impairment and by ~7-fold in patients with severe hepatic impairment (compared to patients with normal hepatic function).

Brand Names: International
International Brand Names by Country
For country code abbreviations (show table)

  • (AR) Argentina: Orilissa;
  • (BD) Bangladesh: Orili;
  • (PR) Puerto Rico: Orilissa
  1. <800> Hazardous Drugs—Handling in Healthcare Settings. United States Pharmacopeia and National Formulary (USP 40-NF 35). Rockville, MD: United States Pharmacopeia Convention; 2017:83-102.
  2. Becker CM, Bokor A, Heikinheimo O, et al. ESHRE guideline: endometriosis. Hum Reprod Open. 2022;2022(2):hoac009. doi:10.1093/hropen/hoac009 [PubMed 35350465]
  3. Ng J, Chwalisz K, Carter DC, Klein CE. Dose-dependent suppression of gonadotropins and ovarian hormones by elagolix in healthy premenopausal women. J Clin Endocrinol Metab. 2017;102(5):1683-1691. doi:10.1210/jc.2016-3845. [PubMed 28323948]
  4. Orilissa (elagolix) [prescribing information]. North Chicago, IL: AbbVie Inc; June 2023.
  5. Orilissa (elagolix) [product monograph]. St-Laurent, Quebec, Canada: AbbVie Corporation; August 2021.
  6. Schenken RS. Endometriosis: treatment of pelvic pain. UpToDate. Waltham, MA: UpToDate Inc. https://www.uptodate.com. Accessed August 23, 2023.
  7. Struthers RS, Nicholls AJ, Grundy J, et al. Suppression of gonadotropins and estradiol in premenopausal women by oral administration of the nonpeptide gonadotropin-releasing hormone antagonist elagolix. J Clin Endocrinol Metab. 2009;94(2):545-551. doi:10.1210/jc.2008-1695. [PubMed 19033369]
  8. Surrey E, Taylor HS, Giudice L, et al. Long-term outcomes of elagolix in women with endometriosis: results from two extension studies. Obstet Gynecol. 2018;132(1):147-160. doi:10.1097/AOG.0000000000002675. [PubMed 29889764]
  9. Taylor HS, Giudice LC, Lessey BA, et al. Treatment of endometriosis-associated pain with elagolix, an oral GnRH antagonist. N Engl J Med. 2017;377(1):28-40. doi:10.1056/NEJMoa1700089. [PubMed 28525302]
  10. US Department of Health and Human Services; Centers for Disease Control and Prevention; National Institute for Occupational Safety and Health. NIOSH list of antineoplastic and other hazardous drugs in healthcare settings 2016. https://www.cdc.gov/niosh/docs/2016-161/default.html. Updated September 2016. Accessed July 31, 2018.
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