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Voxelotor

FDA Drug Information • Also known as: Oxbryta

Brand Names
Oxbryta
Drug Class
Hemoglobin S Polymerization Inhibitor [EPC]
Route
ORAL
Dosage Form
TABLET, FILM COATED
Product Type
HUMAN PRESCRIPTION DRUG

Description

11 DESCRIPTION OXBRYTA contains voxelotor, a hemoglobin S polymerization inhibitor. The chemical name of voxelotor is 2-hydroxy-6-((2-(1-isopropyl-1 H -pyrazol-5-yl)pyridin-3-yl)methoxy)benzaldehyde with a molecular formula of C 19 H 19 N 3 O 3 and a molecular weight of 337.4. The chemical structure of voxelotor is: Voxelotor is a white-to-yellow-to-beige compound in crystalline Form II of its free base. It is non-hygroscopic and highly soluble in common organic solvents such as acetone and toluene and insoluble in water. OXBRYTA film-coated tablets for oral use contain either 300 mg or 500 mg of voxelotor. Both strengths of OXBRYTA film-coated tablets contain the following inactive ingredients: colloidal silicon dioxide, croscarmellose sodium, magnesium stearate, microcrystalline cellulose, and sodium lauryl sulfate. In addition, the 500 mg tablet film coating contains: polyethylene glycol 3350, polyvinyl alcohol, talc, titanium dioxide, and yellow iron oxide. The 300 mg tablet film coating contains: black and red iron oxide, polyethylene glycol 3350, polyvinyl alcohol, talc, and titanium dioxide. Each OXBRYTA tablet for oral suspension contains 300 mg of voxelotor with the following inactive ingredients: artificial grape flavor, colloidal silicon dioxide, croscarmellose sodium, iron oxide pigment, magnesium stearate, microcrystalline cellulose, and sucralose. Chemical Structure

What Is Voxelotor Used For?

1 INDICATIONS AND USAGE OXBRYTA is indicated for the treatment of sickle cell disease (SCD) in adults and pediatric patients 4 years of age and older. This indication is approved under accelerated approval based on increase in hemoglobin (Hb) [see Clinical Studies (14) ] . Continued approval for this indication may be contingent upon verification and description of clinical benefit in confirmatory trial(s). OXBRYTA is a hemoglobin S polymerization inhibitor indicated for the treatment of sickle cell disease in adults and pediatric patients 4 years of age and older. This indication is approved under accelerated approval based on increase in hemoglobin (Hb). Continued approval for this indication may be contingent upon verification and description of clinical benefit in confirmatory trial(s). ( 1 )

Dosage and Administration

2 DOSAGE AND ADMINISTRATION OXBRYTA can be taken with or without food. ( 2.7 ) Recommended dosage:

  • Adults and pediatric patients 12 years and older: 1,500 mg orally once daily. ( 2.1 )
  • Pediatric patients 4 to less than 12 years: Dosing with OXBRYTA is based on body weight. See Table 1 for complete dosing recommendations. ( 2.2 ) Recommended dosage for severe hepatic impairment (Child Pugh C) :
  • Adults and pediatric patients 12 years and older: 1,000 mg orally once daily. ( 2.3 )
  • Pediatric patients 4 to less than 12 years: Reduce the dose of OXBRYTA based on body weight. See Table 2 for complete dosing recommendations. ( 2.4 ) 2.1 Recommended Dosage for Adults and Pediatric Patients 12 Years and Older The recommended dosage of OXBRYTA is 1,500 mg orally once daily. 2.2 Recommended Dosage for Pediatric Patients 4 Years to Less Than 12 Years For pediatric patients 4 years to less than 12 years, select the appropriate product (OXBRYTA tablets or OXBRYTA tablets for oral suspension) based on patient's ability to swallow tablets and patient's weight. The recommended dosage of OXBRYTA for pediatric patients 4 years to less than 12 years is shown in Table 1. Table 1: Recommended OXBRYTA Dosage in Pediatric Patients 4 Years to Less Than 12 Years Body Weight Recommended Dose (once daily) 40 kg or greater 1,500 mg 20 kg to less than 40 kg 900 mg 10 kg to less than 20 kg 600 mg 2.3 Recommended Dosage for Adults and Pediatric Patients 12 Years and Older with Hepatic Impairment The recommended dosage of OXBRYTA in adults and pediatric patients 12 years and older with severe hepatic impairment (Child Pugh C) is 1,000 mg orally once daily. No dosage adjustment of OXBRYTA is required for patients with mild or moderate hepatic impairment [ see Use in Specific Populations (8.6) and Clinical Pharmacology (12.3) ]. 2.4 Recommended Dosage for Pediatric Patients 4 Years to Less Than 12 Years with Hepatic Impairment The recommended dosage of OXBRYTA in pediatric patients 4 years to less than 12 years with severe hepatic impairment (Child Pugh C) is described in Table 2. No dosage adjustment of OXBRYTA is required for patients with mild or moderate hepatic impairment [see Use in Specific Populations (8.6) and Clinical Pharmacology (12.3) ] . Table 2: Recommended OXBRYTA Dosage in Pediatric Patients 4 Years to Less Than 12 Years with Severe Hepatic Impairment (Child Pugh C) Body Weight Recommended Dose (once daily) 40 kg or greater 1,000 mg (two 500 mg tablets) or 900 mg (three 300 mg tablets for oral suspension or three 300 mg tablets) 20 kg to less than 40 kg 600 mg 10 kg to less than 20 kg 300 mg 2.5 Recommended Dosage of OXBRYTA for Adults and Pediatric Patients 12 Years and Older When Used with Concomitant Strong or Moderate CYP3A4 Inducers CYP3A4 Inducers Avoid concomitant use of strong or moderate CYP3A4 inducers with OXBRYTA [see Drug Interactions (7.1) and Clinical Pharmacology (12.3) ] . If concomitant use of strong CYP3A4 inducers is unavoidable, the...

    • Side Effects (Adverse Reactions)

    6 ADVERSE REACTIONS The following clinically significant adverse reaction is discussed in other sections of the labeling:

  • Hypersensitivity Reactions [see Contraindications (4) and Warnings and Precautions (5.1) ]. Most common adverse reactions (incidence ≥10% with a difference of >3% compared to placebo) are headache, diarrhea, abdominal pain, nausea, rash, and pyrexia. ( 6.1 ) Most common adverse reactions (incidence >10%) reported in pediatric patients 4 to <12 years are pyrexia, vomiting, rash, abdominal pain, diarrhea, and headache. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Pfizer Inc. at 1-800-438-1985 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch . 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. Adults and Pediatric Patients 12 Years and Older The safety of OXBRYTA was evaluated in the HOPE trial based on data from 88 patients with SCD who received OXBRYTA 1,500 mg and 91 patients who received placebo orally once daily [see Clinical Studies (14.1) ] . Seventy-four patients received OXBRYTA 1,500 mg once daily for ≥24 weeks, 65 patients for ≥48 weeks, and 63 patients completed the 72-week treatment period. In patients who received OXBRYTA 1,500 mg once daily the median age was 24 years (range:12 to 59 years); 65% female; 66% Black or African American and 23% Arab/Middle Eastern; and 65% receiving hydroxyurea at baseline. Serious adverse reactions occurred in 3% (3/88) of patients receiving OXBRYTA 1,500 mg, which included headache, drug hypersensitivity, and pulmonary embolism occurring in 1 patient each. Permanent discontinuation due to an adverse reaction (Grades 1-4) occurred in 5% (4/88) of patients who received OXBRYTA 1,500 mg. Dosage modifications (dose reduction or dosing interruption) due to adverse reactions occurred in 14% (12/88) of patients who received OXBRYTA 1,500 mg. The adverse reactions requiring dosage modification included rash (4.5%), diarrhea (3.4%), headache (2.3%), nausea (2.3%), abdominal pain (1.1%), and drug hypersensitivity (1.1%). The safety profile observed in pediatric patients 12 to <17 years treated with OXBRYTA in the HOPE trial was similar to that seen in adult patients. The most common adverse reactions occurring in ≥10% of patients treated with OXBRYTA 1,500 mg with a difference of >3% compared to placebo are summarized in Table 4. Table 4: Adverse Reactions (≥10%) in Patients Receiving OXBRYTA with a Difference Between Arms of >3% Compared to Placebo in HOPE Adverse Reaction Adverse reactions were Grades 1 or 2 except for Grade 3 headache (2), diarrhea (1), nausea (1), rash (1), and rash generalized (3) OXBRYTA 1,500 mg (N=88) Placebo (N=91) Headache 32% 25% Diarrhea 23% 11% Abdominal Pain Abdominal pain (grouped PTs) includes the following PTs: abdominal pain, lower abdominal pain, and upper abdominal pain 23% 16% Nausea 19% 10% Rash Rash (grouped PTs) includes the following PTs: rash, urticaria, generalized rash, macular rash, maculo-papular rash, pruritic rash, and papular rash 15% 11% Pyrexia 15% 8% Clinically relevant adverse reactions occurring in <10% of patients included:
  • Drug hypersensitivity Pediatric Patients 4 to <12 Years The safety of OXBRYTA in pediatric patients 4 to <12 years with SCD was evaluated in an open-label, Phase 2 study [see Clinical Studies (14.2) ] . In this study, 45 patients 4 to <12 years of age received doses of OXBRYTA tablets for oral suspension based on weight at baseline. Thirty-five patients received OXBRYTA for 24 weeks and 26 patients for 48 weeks. The most common adverse reactions (>10%) reported in pediatric patients 4 to <12 years were pyrexia (36%), vomiting (33%), rash (20%), abdominal pain (18%), diarrhea (18%), and headache (18%). The overall safety profile of OXBRYTA in...

    • Drug Interactions

    7 DRUG INTERACTIONS

  • Sensitive CYP3A4 Substrates: Avoid coadministration of sensitive CYP3A4 substrates with a narrow therapeutic index. ( 7.2 )
  • Strong or moderate CYP3A4 Inducers: Avoid coadministration with strong or moderate CYP3A4 inducers. If unavoidable, increase the dose of OXBRYTA. ( 2.5 , 2.6 , 7.1 ) 7.1 Effect of Other Drugs on Voxelotor Strong or Moderate CYP3A4 Inducers Coadministration of strong or moderate CYP3A4 inducers may decrease voxelotor plasma and whole blood concentrations and may lead to reduced efficacy. Avoid coadministration of OXBRYTA with strong or moderate CYP3A4 inducers. Increase the OXBRYTA dosage when coadministration with a strong or moderate CYP3A4 inducer is unavoidable [see Dosage and Administration (2.5 , 2.6) and Clinical Pharmacology (12.3) ]. 7.2 Effect of Voxelotor on Other Drugs Voxelotor increased the systemic exposure of midazolam (a sensitive CYP3A4 substrate) [see Clinical Pharmacology (12.3) ]. Avoid coadministration of OXBRYTA with sensitive CYP3A4 substrates with a narrow therapeutic index. If concomitant use is unavoidable, consider dose reduction of the sensitive CYP3A4 substrate(s). 7.3 Laboratory Test Interference OXBRYTA administration may interfere with measurement of Hb subtypes (HbA, HbS, and HbF) by HPLC [see Warnings and Precautions (5.2) ]. If precise quantitation of Hb species is required, chromatography should be performed when the patient has not received OXBRYTA therapy in the immediately preceding 10 days.

    • Contraindications

    4 CONTRAINDICATIONS OXBRYTA is contraindicated in patients with a history of serious drug hypersensitivity reaction to voxelotor or excipients. Clinical manifestations may include generalized rash, urticaria, mild shortness of breath, mild facial swelling, and eosinophilia [see Warnings and Precautions (5.1) and Adverse Reactions (6.1) ]. Prior drug hypersensitivity to voxelotor or excipients. ( 4 )

    Pregnancy and Breastfeeding

    8.1 Pregnancy Risk Summary There are no available data on OXBRYTA use in pregnant women to evaluate for a drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes. In animal reproduction studies, oral administration of voxelotor to pregnant rats and rabbits during organogenesis at exposures up to 2.8-times (rats) and 0.3-times (rabbits) the exposure at the maximum recommended human dose resulted in no adverse developmental effects (see Data ). The estimated background risk of major birth defects and miscarriage for the indicated population is approximately 14% and up to 43%, respectively. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. There are adverse effects on maternal and fetal outcomes associated with SCD in pregnancy (see Clinical Considerations ). OXBRYTA should only be used during pregnancy if the benefit of the drug outweighs the potential risk. Clinical Considerations Disease-Associated Maternal and/or Embryo/Fetal Risk Women with SCD have an increased risk of adverse pregnancy outcomes for the mother and the fetus. Pregnant women are at greater risk for vasoocclusive crises, pre-eclampsia, eclampsia, and maternal mortality. For the fetus, there is an increased risk for intrauterine growth restriction, preterm delivery, low birth weight, and perinatal mortality. Data Animal Data In embryo-fetal development studies, voxelotor was administered orally to pregnant rats at 15, 50, and 250 mg/kg/day (gestation days 7 through 17) and rabbits at 25, 75, and 150 mg/kg/day (gestation days 7 through 19) through organogenesis. Maternal toxicity was observed at the highest dose levels in these studies equivalent to 2.8-times (rats) and 0.3-times (rabbits) the exposures in patients receiving OXBRYTA at the recommended daily dose. There was no evidence of adverse developmental outcomes in rats or rabbits. In a pre- and postnatal development study, voxelotor was administered orally to...

    How Supplied

    16 HOW SUPPLIED/STORAGE AND HANDLING The 300 mg tablet is film-coated, light purple to purple, oval shaped, biconvex, debossed with "G 300" on one side, available in:

  • Bottles of 60 tablets with one desiccant canister, a polyester coil and child-resistant closure: NDC 72786-102-02
  • Bottles of 90 tablets with one desiccant canister, a polyester coil and child-resistant closure: NDC 72786-102-03 The 500 mg tablet is film-coated, light yellow to yellow, oval shaped, biconvex, debossed with "GBT 500" on one side, and available in:
  • Bottles of 90 tablets with one desiccant canister, a polyester coil and child-resistant closure: NDC 72786-101-01 The 300 mg tablet for oral suspension is light yellow to yellow, round shaped, debossed with "300 D" on one side, and available in:
  • Bottles of 60 tablets for oral suspension with a polyester coil and child-resistant closure: NDC 72786-111-02
  • Bottles of 90 tablets for oral suspension with a polyester coil and child-resistant closure: NDC 72786-111-03 Do not eat the desiccant canister or the polyester coil. Store OXBRYTA at 20°C to 30°C (68°F to 86°F).

    • About This Information

    This drug information is sourced from FDA-approved labeling via the openFDA database. It is intended for educational and reference purposes only. This is not medical advice. Always consult your healthcare provider before making decisions about medication. Drug information may be updated by the FDA; check with your pharmacist for the most current information.

    What are side effects?

    Side effects are unwanted reactions that can occur when taking a medication. They range from mild (headache, nausea) to severe (allergic reactions, organ damage). Not everyone experiences side effects, and severity varies. Report any concerning side effects to your doctor.

    What are drug interactions?

    Drug interactions occur when a medication is affected by another drug, food, or supplement. Interactions can make medications less effective or cause dangerous side effects. Always tell your doctor about all medications and supplements you take.