OXBRYTA® (voxelotor) 7 DRUG INTERACTIONS

(voxelotor)

Prescribing Information

7 DRUG INTERACTIONS

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.

Medication Guide

MEDICATION GUIDE

This Patient Information has been approved by the U.S. Food and Drug Administration				Revised: 08/2023
PATIENT INFORMATION
	OXBRYTA® (ox brye ta) (voxelotor) tablets			OXBRYTA® (ox brye ta) (voxelotor) tablets for oral suspension
What is OXBRYTA? OXBRYTA is a prescription medicine used for the treatment of sickle cell disease in adults and children 4 years of age and older. It is not known if OXBRYTA is safe and effective in children with sickle cell disease below 4 years of age.
Do not take OXBRYTA if you or your child have had an allergic reaction to voxelotor or any of the ingredients in OXBRYTA. See the end of this leaflet for a list of the ingredients in OXBRYTA.
Before taking OXBRYTA, tell your healthcare provider about all of your medical conditions, including if you or your child: • have liver problems • are pregnant or plan to become pregnant. It is not known if OXBRYTA can harm your unborn baby. • are breastfeeding or plan to breastfeed. It is not known if OXBRYTA can pass into your breastmilk and if it can harm your baby. Do not breastfeed during treatment with OXBRYTA and for at least 2 weeks after the last dose. Tell your healthcare provider about all the medicines you or your child take, including prescription and over-the-counter medicines, vitamins, and herbal supplements. Some medicines may affect how OXBRYTA works. OXBRYTA may also affect how other medicines work and may affect the results of certain blood tests. Keep a list of all your medicines and show it to your healthcare provider.
How should I take OXBRYTA? • Take OXBRYTA exactly as your healthcare provider tells you. • Do not change your dose or stop taking OXBRYTA unless your healthcare provider tells you to. Your healthcare provider may change your dose if needed. • Take your prescribed dose of OXBRYTA 1 time each day. • Take OXBRYTA with or without food. • OXBRYTA comes in two different dosage forms, OXBRYTA tablets and OXBRYTA tablets for oral suspension. Your healthcare provider will decide which dosage form you take based on your age, weight, and ability to swallow tablets. o If you take OXBRYTA tablets: Swallow each OXBRYTA tablet whole. Do not cut, crush, or chew the tablets. o If you take OXBRYTA tablets for oral suspension: See the detailed Instructions for Use on how to prepare and take your dose. You must mix the OXBRYTA tablets for oral suspension in room temperature clear drink, such as drinking water, clear soda, apple juice, clear electrolyte drinks, clear flavored drinks, or clear sports drinks, right before taking it. Do not swallow whole, cut, crush, or chew the tablets for oral suspension. • Check to make sure you receive the correct dosage form of OXBRYTA each time your prescription is filled to avoid taking the wrong medicine. • Your healthcare provider may also prescribe a medicine called hydroxyurea during treatment with OXBRYTA. • If you or your child miss a dose of OXBRYTA or if the entire dose is not taken, skip that dose and return to your normal dosing schedule the next day.
What should I avoid while taking OXBRYTA? Do not take St. John's wort during treatment with OXBRYTA.
What are the possible side effects of OXBRYTA? OXBRYTA can cause serious side effects, including: • Severe skin rash and serious allergic reactions. Treatment with OXBRYTA may cause severe skin reactions and serious allergic reactions. The organs in your body may also be affected, such as your liver, kidneys or lungs, and your blood cells. • Stop taking OXBRYTA, and tell your healthcare provider or get emergency medical help right away if you develop any of the following signs or symptoms during treatment:
	o rash o hives o high temperature (fever) o swollen glands (lymph nodes) o trouble swallowing		o shortness of breath (difficult breathing) o swelling of your face, around your eyes, lips, or tongue o lack of energy and tiredness (fatigue) o muscle or joint aches
The most common side effects of OXBRYTA include:
• headache • diarrhea • stomach-area (abdominal) pain		• nausea • rash or hives • fever
The most common side effects of OXBRYTA in children ages 4 to less than 12 years of age include:
• fever • vomiting • rash		• stomach-area (abdominal) pain • diarrhea • headache
These are not all the possible side effects of OXBRYTA. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. You may also report side effects to Pfizer Inc. at 1-800-438-1985.
How should I store OXBRYTA? • Store OXBRYTA between 68°F to 86°F (20°C to 30°C). • The OXBRYTA bottle comes with a child-resistant closure. • The OXBRYTA bottle may contain a desiccant canister to help keep your medicine dry (protect it from moisture) and a polyester coil. Do not eat the desiccant or polyester coil. Keep OXBRYTA and all medicines out of the reach of children.
General information about the safe and effective use of OXBRYTA. Medicines are sometimes prescribed for purposes other than those listed in a Patient Information leaflet. Do not use OXBRYTA for a condition for which it was not prescribed. Do not give OXBRYTA to other people, even if they have the same symptoms that you have. It may harm them. You can ask your pharmacist or healthcare provider for information about OXBRYTA that is written for health professionals.
What are the ingredients of OXBRYTA? Active Ingredient: voxelotor Inactive Ingredients: OXBRYTA tablets: colloidal silicon dioxide, croscarmellose sodium, magnesium stearate, microcrystalline cellulose, and sodium lauryl sulfate. 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. OXBRYTA tablets for oral suspension: artificial grape flavor, colloidal silicon dioxide, croscarmellose sodium, iron oxide pigment, magnesium stearate, microcrystalline cellulose, and sucralose. Distributed by Global Blood Therapeutics, Inc A subsidiary of Pfizer Inc. South San Francisco, CA 94080 LAB-1567-1.0 For more information, go to www.pfizer.com or call 1-800-438-1985.

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