Elagolix, estradiol, and norethisterone
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From MedlinePlus, U.S. National Library of Medicine
Specialty pharmacy: therapy management checklist, storage and cold chain, dosing calendar, Medicare Part D coverage.
Boxed warning
WARNING: THROMBOEMBOLIC DISORDERS AND VASCULAR EVENTS Estrogen and progestin combinations, including ORIAHNN, increase the risk of thrombotic or thromboembolic disorders including pulmonary embolism, deep vein thrombosis, stroke and myocardial infarction, especially in women at increased risk for these events [see Warnings and Precautions ( 5.1 )] . ORIAHNN is contraindicated in women with current or a history of thrombotic or thromboembolic disorders and in women at increased risk for these events, including women over 35 years of age who smoke and women with uncontrolled hypertension [see Contraindications ( 4 )] .
WARNING: THROMBOEMBOLIC DISORDERS AND VASCULAR EVENTS See full prescribing information for complete boxed warning. Estrogen and progestin combinations, including ORIAHNN, increase the risk of thrombotic or thromboembolic disorders, especially in women at increased risk for these events. ( 5.1 ) ORIAHNN is contraindicated in women with current or a history of thrombotic or thromboembolic disorders and in women at increased risk for these events including women over 35 years of age who smoke or women with uncontrolled hypertension. ( 4 )
Handling and access
NIOSH hazardous drug
Table 2This product contains estradiol, which NIOSH lists as a hazardous drug. AHFS class: 68:16.04 estrogens; 92:24 bone resorption inhibitors.
- Meets the NIOSH definition of a hazardous drug (carcinogenicity, developmental or reproductive toxicity, organ toxicity at low doses, or genotoxicity) without MSHI or a Group 1 or 2A carcinogen classification.
Handle with the precautions your facility uses for hazardous drugs (USP <800>). NIOSH's Managing Hazardous Drug Exposures lists controls by drug form and activity.
Dosing in kidney impairment
Renal Impairment No dose adjustment of ORIAHNN is required in women with any degree of renal impairment or end-stage renal disease (including women on dialysis) [see Clinical Pharmacology ] .
Dosing in liver impairment
Hepatic Impairment ORIAHNN is contraindicated in women with any hepatic impairment or disease [see Contraindications ] . The use of estradiol (a component of ORIAHNN) in patients with hepatic impairment, compared to patients with normal hepatic function, is expected to increase the blood levels of estradiol and increase the risk of estradiol-associated adverse reactions.
Additionally, the use of elagolix (a component of ORIAHNN) in patients with moderate and severe hepatic impairment, compared to patients with normal hepatic function, increased elagolix exposures 3-fold and 7-fold, respectively, and this increases the risk of elagolix-associated adverse reactions [see Clinical Pharmacology ] .
Drug interactions
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Add the patient's other drugs. Matches come from both FDA labels: by name, drug class, and enzyme or transporter pathway.
- Elagolix, estradiol, and norethisterone
Label text (7 paragraphs)
See full prescribing information for a list of clinically important drug interactions. ( 7 )
7.1 Potential for ORIAHNN to Affect Other Drugs Elagolix (a component of ORIAHNN) is: A weak to moderate inducer of cytochrome P450 (CYP3A). Co-administration with ORIAHNN may decrease plasma concentrations of drugs that are substrates of CYP3A. A weak inhibitor of CYP2C19. Co-administration with ORIAHNN may increase plasma concentrations of drugs that are substrates of CYP2C19 (see Table 3). An inhibitor of efflux transporter P-glycoprotein (P-gp). Co-administration with ORIAHNN may increase plasma concentrations of drugs that are substrates of P-gp (see Table 3).
The effects of co-administration of ORIAHNN on concentrations of concomitant drugs and the clinical recommendations for these drug interactions are summarized in Table 3. Table 3. Drug Interactions: Effects of ORIAHNN on Other Drugs Concomitant Drug Class: Drug Name Effect on Plasma Exposure of Concomitant Drug Clinical Recommendations Cardiac glycosides: digoxin ↑ digoxin Increase monitoring of digoxin concentrations and potential signs and symptoms of clinical toxicity when initiating ORIAHNN in patients who are taking digoxin. If ORIAHNN is discontinued, increase monitoring of digoxin concentrations.
Benzodiazepines: oral midazolam ↓ midazolam Consider increasing the dose of midazolam by no more than 2-fold and individualize midazolam therapy based on the patient’s response. Statins: rosuvastatin ↓ rosuvastatin Monitor lipid levels and adjust the dose of rosuvastatin, if necessary. Proton pump inhibitors: omeprazole ↑ omeprazole No dose adjustment needed for omeprazole 40 mg once daily when co-administered with ORIAHNN. When ORIAHNN is used concomitantly with higher doses of omeprazole, consider dosage reduction of omeprazole. See Tables 6 and 7 [see Clinical Pharmacology ( 12.3 ) ] .
The direction of the arrow indicates the direction of the change in the area under the curve (AUC) (↑= increase, ↓ = decrease).
7.2 Potential for Other Drugs to Affect ORIAHNN Elagolix (a component of ORIAHNN) is a substrate of CYP3A, P-gp, and OATP1B1; estradiol and norethindrone acetate are metabolized partially by CYP3A [see Clinical Pharmacology ( 12.3 ) ] . Concomitant use of ORIAHNN with: Strong CYP3A inducers may decrease elagolix, estradiol, and norethindrone plasma concentrations and may result in a decrease of the therapeutic effects of ORIAHNN. Rifampin is not recommended. The concomitant use of rifampin increased plasma concentrations of elagolix [see Clinical Pharmacology ( 12.3 ) ] . Strong CYP3A inhibitors are not recommended.
Concomitant use of ORIAHNN with strong CYP3A inhibitors may increase elagolix, estradiol, and norethindrone plasma concentrations and increase the risk of adverse reactions. OATP1B1 inhibitors that are known or expected to significantly increase elagolix plasma concentrations is contraindicated due to increased risk of elagolix-associated adverse reactions [see Contraindications ( 4 ) ] .
Contraindications
4 CONTRAINDICATIONS ORIAHNN is contraindicated in women: With a high risk of arterial, venous thrombotic, or thromboembolic disorders [see Boxed Warning and Warnings and Precautions ( 5.1 ) ] . Examples include women over 35 years of age who smoke, and women who are known to have: ○ current or history of deep vein thrombosis or pulmonary embolism ○ vascular disease (e.g., cerebrovascular disease, coronary artery disease, peripheral vascular disease) ○ thrombogenic valvular or thrombogenic rhythm diseases of the heart (for example, subacute bacterial endocarditis with valvular disease, or atrial fibrillation) ○ inherited or acquired hypercoagulopathies ○ uncontrolled hypertension ○ headaches with focal neurological symptoms or have migraine headaches with aura if over age 35 Who are pregnant. Exposure to ORIAHNN early in pregnancy may increase the risk of early pregnancy loss [see Use in Specific Populations ( 8.1 ) ] . With known osteoporosis because of the risk of further bone loss [see Warnings and Precautions ( 5.2 ) ] . With current or history of breast cancer or other hormonally-sensitive malignancies, and with increased risk for hormonally-sensitive malignancies [see Warnings and Precautions ( 5.3 ) ] . With known hepatic impairment or disease [see Warnings and Precautions ( 5.5 ) ] . With undiagnosed abnormal uterine bleeding. With known anaphylactic reaction, angioedema, or hypersensitivity to ORIAHNN or any of its components. Taking inhibitors of organic anion transporting polypeptide (OATP)1B1 (a hepatic uptake transporter) that are known or expected to significantly increase elagolix plasma concentrations [see Drug Interactions ( 7.2 ) ] . High risk of arterial, venous thrombotic, or thromboembolic disorder. ( 4 ) Pregnancy. ( 4 ) Known osteoporosis. ( 4 ) Current or history of breast cancer or other hormonally-sensitive malignancies. ( 4 ) Known liver impairment or disease. ( 4 ) Undiagnosed abnormal uterine bleeding. ( 4 ) Known hypersensitivity to ingredients of ORIAHNN. ( 4 ) Organic anion transporting polypeptide (OATP)1B1 inhibitors that are known or expected to significantly increase elagolix plasma concentrations. ( 4 )
Safety data
Reported adverse events (FAERS)
Liver injury (LiverTox)
LiverTox has no chapter for elagolix, estradiol, and norethisterone. Check the label's hepatic warnings.
Pregnancy and lactation
Pregnancy
8.1 Pregnancy Risk Summary Use of ORIAHNN is contraindicated in pregnant women. Exposure to elagolix early in pregnancy may increase the risk of early pregnancy loss. Discontinue ORIAHNN if pregnancy occurs during treatment. The limited human data with the use of elagolix in pregnant women are insufficient to determine whether there is a risk for major birth defects or miscarriage [see Data ]. When pregnant rats and rabbits were orally dosed with elagolix during the period of organogenesis, postimplantation loss was observed in pregnant rats at doses 12 times the maximum recommended human dose (MRHD).
Spontaneous abortion and total litter loss were observed in rabbits at doses 4 and 7 times the MRHD. There were no structural abnormalities in the fetuses at exposures up to 25 and 7 times the MRHD for the rat and rabbit, respectively [see Data ] . Data Human Data There was one pregnancy reported in the 453 women who received ORIAHNN in the Phase 3 uterine fibroids clinical trials. The pregnancy resulted in a spontaneous abortion and the estimated fetal exposure to ORIAHNN occurred during the first 18 days of pregnancy. Animal Data Embryofetal development studies were conducted in the rat and rabbit.
Elagolix was administered by oral gavage to pregnant rats (25 animals/dose) at doses of 0, 300, 600, and 1200 mg/kg/day and to rabbits (20 animals/dose) at doses of 0, 100, 150, and 200 mg/kg/day during the period of organogenesis (gestation day 6-17 in the rat and gestation day 7-20 in the rabbit). In rats, maternal toxicity was present at all doses and included six deaths and decreases in body weight gain and food consumption. Increased postimplantation losses were present in the mid dose group, which was 12 times the MRHD based on AUC.
In rabbits, three spontaneous abortions and a single total litter loss were observed at the highest maternally toxic dose, which was 7 times the MRHD based on AUC. A single total litter loss occurred at a lower non-maternally toxic dose of 150 mg/kg/day, which was 4 times the MRHD. No fetal malformations were present at any dose level tested in either species even in the presence of maternal toxicity. At the highest doses tested, the exposure margins were 25 and 7 times the MRHD for the rat and rabbit, respectively.
However, because elagolix binds poorly to the rat gonadotropin-releasing hormone (GnRH) receptor (~1000 fold less than to the human GnRH receptor), the rat study is unlikely to identify pharmacologically mediated effects of elagolix on embryofetal development. The rat study is still expected to provide information…
For breastfeeding, also see LactMed (National Library of Medicine), which summarizes milk levels and infant effects.
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