ALYFTREK

Indications and Usage ( 1 ) 03/2026 Warnings and Precautions, Intracranial Hypertension ( 5.4 ) 09/2025 Warnings and Precautions, Neuropsychiatric Events, Including Suicidal Thoughts and Behaviors ( 5.5 ) 03/2026

1 INDICATIONS AND USAGE ALYFTREK is indicated for the treatment of cystic fibrosis (CF) in adult and pediatric patients 6 years of age and older who have a clinical diagnosis of CF and who have at least one variant in the cystic fibrosis transmembrane conductance regulator ( CFTR ) gene that is either responsive based on clinical and/or in vitro data (see Table 5 ) or results in production of CFTR protein [see Clinical Pharmacology (12.1) ]. If the patient's genotype is unknown, an FDA-cleared CF genetic test should be used to confirm the presence of at least one variant in the CFTR gene that is either responsive based on clinical and/or in vitro data or results in production of CFTR protein. ALYFTREK is a combination of deutivacaftor, a CFTR potentiator, tezacaftor, and vanzacaftor indicated for the treatment of cystic fibrosis (CF) in adult and pediatric patients aged 6 years and older who have a clinical diagnosis of CF and who have at least one variant in the CFTR gene that is either responsive based on clinical and/or in vitro data or results in production of CFTR protein. ( 1 , 12.1 ) If the patient's genotype is unknown, an FDA-cleared CF genetic test should be used to confirm the presence of at least one variant in the CFTR gene that is either responsive based on clinical and/or in vitro data or results in production of CFTR protein. ( 1 )

2 DOSAGE AND ADMINISTRATION Prior to initiating ALYFTREK obtain liver function tests (ALT, AST, alkaline phosphatase, and bilirubin) in all patients. Monitor liver function tests every month during the first 6 months of treatment, then every 3 months during the next 12 months, then at least annually thereafter. ( 2.1 , 5.1 ) Recommended Dosage for Adult and Pediatric Patients Aged 6 Years and Older (with fat-containing food) ( 2.2 ) Age Weight Once Daily Oral Dosage 6 to less than 12 years old Less than 40 kg Three tablets of vanzacaftor 4 mg/tezacaftor 20 mg/deutivacaftor 50 mg Greater than or equal to 40 kg Two tablets of vanzacaftor 10 mg/tezacaftor 50 mg/deutivacaftor 125 mg 12 years and older Any Weight Two tablets of vanzacaftor 10 mg/tezacaftor 50 mg/deutivacaftor 125 mg Should not be used in patients with severe hepatic impairment. Use not recommended in patients with moderate hepatic impairment unless the benefit outweighs the risk. If used, no dose adjustment is recommended. Liver function tests should be closely monitored. ( 2.4 , 5.1 , 6.1 , 8.7 ) See full prescribing information for dosage modifications for concomitant use of ALYFTREK with strong or moderate CYP3A inhibitors. ( 2.3 , 5.7 , 7.1 ) 2.1 Recommended Laboratory Testing Prior to ALYFTREK Initiation and During Treatment Prior to initiating ALYFTREK, obtain liver function tests (ALT, AST, alkaline phosphatase, and bilirubin) for all patients. Monitor liver function tests every month during the first 6 months of treatment, then every 3 months for the next 12 months, then at least annually thereafter. Consider more frequent monitoring for patients with a history of liver disease, elevated liver function tests at baseline, or a history of elevated liver function tests with drugs containing elexacaftor, tezacaftor, and/or ivacaftor [see Warnings and Precautions (5.1) and Use in Specific Populations (8.7) ]. 2.2 Recommended Dosage The recommended ALYFTREK dosage in adult and pediatric patients aged 6 years and older is provided in Table 1. Administer ALYFTREK orally (swallow the tablets whole) with fat-containing food, once daily, at approximately the same time each day [see Clinical Pharmacology (12.3) ]. Examples of meals or snacks that contain fat are those prepared with butter or oils or those containing eggs, peanut butter, cheeses, nuts, whole milk, or meats. Table 1: Recommended Dosage of ALYFTREK in Adult and Pediatric Patients Aged 6 Years and Older Age Weight Once Daily Oral Dosage 6 to less than 12 years old Less than 40 kg Three tablets of vanzacaftor 4 mg/tezacaftor 20 mg/deutivacaftor 50 mg (total dose of vanzacaftor 12 mg/tezacaftor 60 mg/ deutivacaftor 150 mg) Greater than or equal to 40 kg Two tablets of vanzacaftor 10 mg/tezacaftor 50 mg/deutivacaftor 125 mg (total dose of vanzacaftor 20 mg/tezacaftor 100 mg/ deutivacaftor 250 mg) 12 years and older Any weight Two tablets of vanzacaftor 10 mg/tezacaftor 50 mg/deutivacaftor 125 mg (total dose of vanzacaftor 20 mg/tezacaftor 100 mg/ deutivacaftor 250 mg) 2.3 Dosage Modification for Strong or Moderate CYP3A Inhibitors Table 2 describes the recommended dosage modification for ALYFTREK when used concomitantly with strong or moderate CYP3A inhibitors [see Warnings and Precautions (5.7) ] . Administer ALYFTREK orally (swallow the tablets whole) with fat-containing food, once daily, at approximately the same time each day [see Clinical Pharmacology (12.3) ]. Table 2: Dosage Modification for Concomitant Use of ALYFTREK with Strong or Moderate CYP3A Inhibitors in Adult and Pediatric Patients Aged 6 Years and Older Age Weight Moderate CYP3A Inhibitors Strong CYP3A Inhibitors 6 to less than 12 years old Less than 40 kg Two tablets of vanzacaftor 4 mg/tezacaftor 20 mg/deutivacaftor 50 mg every other day (total dose of vanzacaftor 8 mg/tezacaftor 40 mg/deutivacaftor 100 mg) Two tablets of vanzacaftor 4 mg/tezacaftor 20 mg/deutivacaftor 50 mg once a week (total dose of vanzacaftor 8 mg/tezacaftor 40 mg/deuti …

3 DOSAGE FORMS AND STRENGTHS Tablets: Fixed-dose combination containing vanzacaftor 4 mg, tezacaftor 20 mg, and deutivacaftor 50 mg. ( 3 ) Fixed-dose combination containing vanzacaftor 10 mg, tezacaftor 50 mg, and deutivacaftor 125 mg. ( 3 ) Tablets: Fixed-dose combination containing vanzacaftor 4 mg (equivalent to 4.24 mg of vanzacaftor calcium dihydrate), tezacaftor 20 mg, and deutivacaftor 50 mg. Each tablet is purple, round-shaped, film-coated, debossed with "V4" on one side and plain on the other. Fixed-dose combination containing vanzacaftor 10 mg (equivalent to 10.6 mg of vanzacaftor calcium dihydrate), tezacaftor 50 mg, and deutivacaftor 125 mg. Each tablet is purple, oblong-shaped, film-coated, debossed with "V10" on one side and plain on the other.

4 CONTRAINDICATIONS None. None. ( 4 )

6 ADVERSE REACTIONS The following clinically significant adverse reactions are discussed in greater detail in other sections of the labeling: Drug-Induced Liver Injury and Liver Failure [see Warnings and Precautions (5.1) ] Hypersensitivity Reactions, Including Anaphylaxis [see Warnings and Precautions (5.2) ] Patients Who Discontinued or Interrupted Elexacaftor-, Tezacaftor-, or Ivacaftor-Containing Drugs Due to Adverse Reactions [see Warnings and Precautions (5.3) ] Intracranial Hypertension [see Warnings and Precautions (5.4) ] Neuropsychiatric Events, Including Suicidal Thoughts and Behaviors [see Warnings and Precautions (5.5) ] Cataracts [see Warnings and Precautions (5.8) ] Most common adverse reactions to ALYFTREK (≥5% of patients and at a frequency higher than ELX/TEZ/IVA by ≥1%) were cough, nasopharyngitis, upper respiratory tract infection, headache, oropharyngeal pain, influenza, fatigue, increased ALT, rash, increased AST, and sinus congestion. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Vertex Pharmaceuticals Incorporated at 1-877-634-8789 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 clinical practice. The adverse reactions data below are from clinical trials of ALYFTREK in patients 6 years of age and older with CF with at least one responsive CFTR variant who were able to tolerate ELX/TEZ/IVA. Adverse reactions data in patients who previously discontinued or interrupted ELX/TEZ/IVA due to adverse reactions are not available . Adverse Reactions in Patients Aged 12 Years and Older with CF The safety of ALYFTREK is based on 480 patients with CF aged 12 years and older who have at least one F508del variant or another responsive variant in the CFTR gene in two, 52-week, active-controlled trials (Trials 1 and 2) [see Clinical Studies (14) ]. In both trials, patients received a fixed-dose combination drug containing elexacaftor, tezacaftor, and ivacaftor (ELX/TEZ/IVA) in a 4-week run-in period and then were subsequently randomized to continue ELX/TEZ/IVA (elexacaftor 200 mg/tezacaftor 100 mg/ivacaftor 150 mg in the morning and ivacaftor 150 mg in the evening) or receive ALYFTREK (vanzacaftor 20 mg/tezacaftor 100 mg/deutivacaftor 250 mg) once daily. Patients with a history of prior intolerance to ELX/TEZ/IVA (i.e., patients who discontinued or interrupted treatment due to adverse reactions) were excluded. Trials 1 and 2 were not designed to evaluate meaningful comparisons of the incidence of adverse reactions between the ALYFTREK and ELX/TEZ/IVA treatment groups. For additional information regarding ELX/TEZ/IVA adverse reactions, refer to ELX/TEZ/IVA Prescribing Information. In Trial 1 and Trial 2 combined, the proportion of patients who discontinued treatment prematurely due to adverse reactions were 3.8% and 3.7% in ALYFTREK and ELX/TEZ/IVA treatment groups, respectively. Serious adverse reactions that occurred more frequently with ALYFTREK treatment than with ELX/TEZ/IVA treatment that occurred in 2 or more patients (≥0.4%) were influenza (1.5%), increased AST (0.4%), increased GGT (0.4%), depression (0.4%), and syncope (0.4%). Table 3: Adverse Reactions Occurring in ≥5% of ALYFTREK-Treated Patients and ≥1% Higher than ELX/TEZ/IVA-Treated Patients Aged 12 Years and Older with CF Who Had at Least One F508del Variant or Responsive Variant in the CFTR Gene (Trials 1 and 2) Adverse Reactions ALYFTREK N=480 ELX/TEZ/IVA N=491 Abbreviations: ALT, alanine aminotransferase; AST, aspartate aminotransferase; ELX, elexacaftor; IVA, ivacaftor; TEZ, tezacaftor Cough Cough is composed of several similar terms including productive cough. 120 (25%) 116 (24%) Nasopharyngitis 102 (21%) 95 (19%) Upper respiratory tract infection Upper respir …

7 DRUG INTERACTIONS Strong or moderate CYP3A inducers : Concomitant use with ALYFTREK is not recommended. ( 5.6 , 7.1 ) Strong or moderate CYP3A inhibitors : Reduce ALYFTREK dosage with concomitant use. Avoid food or drink containing grapefruit. ( 2.3 , 5.7 , 7.1 ) 7.1 Effect of Other Drugs and Grapefruit on ALYFTREK Strong or Moderate CYP3A Inducers Concomitant use of ALYFTREK with strong or moderate CYP3A inducers is not recommended. Vanzacaftor, tezacaftor, and deutivacaftor are substrates of CYP3A. Concomitant use of ALYFTREK with a strong or moderate CYP3A inducer decreases vanzacaftor, tezacaftor, and deutivacaftor exposure [see Clinical Pharmacology (12.3) ] which may reduce ALYFTREK effectiveness [see Warnings and Precautions (5.6) ] . Strong or Moderate CYP3A Inhibitors Reduce the ALYFTREK dosage when used concomitantly with a strong or moderate CYP3A inhibitor [see Dosage and Administration (2.3) ] . Vanzacaftor, tezacaftor, and deutivacaftor are CYP3A substrates. Concomitant use with a strong CYP3A inhibitor increases vanzacaftor, tezacaftor, and deutivacaftor exposure [see Clinical Pharmacology (12.3) ] , which may increase the risk of ALYFTREK adverse reactions [see Warnings and Precautions (5.7) ]. Concomitant use with a moderate CYP3A inhibitor is predicted to increase vanzacaftor, tezacaftor, and deutivacaftor exposure [see Clinical Pharmacology (12.3) ] , which may increase the risk of ALYFTREK adverse reactions [see Warnings and Precautions (5.7) ]. Grapefruit Food or drink containing grapefruit should be avoided during treatment with ALYFTREK. Concomitant use of ALYFTREK with grapefruit juice which contains one or more components that moderately inhibit CYP3A may increase exposure of vanzacaftor, tezacaftor and deutivacaftor. 7.2 Effect of ALYFTREK on Other Drugs P-glycoprotein (P-gp) Substrates Unless otherwise recommended in the P-gp substrate Prescribing Information, monitor more frequently for adverse reactions with concomitant use of ALYFTREK with P-gp substrates where minimal concentration changes may lead to serious adverse reactions related to P-gp substrates. Tezacaftor and deutivacaftor (components of ALYFTREK) are P-gp inhibitors. Administration of tezacaftor/ivacaftor increases exposure of P-gp substrates [see Clinical Pharmacology (12.3) ] , which may increase the risk of adverse reactions related to these substrates. Breast Cancer Resistance Protein (BCRP) Substrates Unless otherwise recommended in the BCRP substrate Prescribing Information, monitor more frequently for adverse reactions with concomitant use of ALYFTREK with BCRP substrates where minimal concentration changes may lead to serious adverse reactions related to BCRP substrates. Vanzacaftor (VNZ) and deutivacaftor (D-IVA) (components of ALYFTREK) are inhibitors of BCRP in vitro. Concomitant use of ALYFTREK with BCRP substrates may increase exposure of these substrates; however, this has not been studied clinically [see Clinical Pharmacology (12.3) ]. CYP2C9 Substrates Use caution when ALYFTREK is used concomitantly with CYP2C9 substrates. Monitor the international normalized ratio (INR) more frequently with concomitant use of ALYFTREK with warfarin. This recommendation is based upon a mechanistic understanding of deutivacaftor pharmacokinetics (it is an inhibitor of CYP2C9 in vitro) [see Clinical Pharmacology (12.3) ] . Concomitant use of ALYFTREK with CYP2C9 substrates may increase exposure of these substrates; however, this has not been studied clinically. 7.3 Drugs with No Clinically Significant Interactions with ALYFTREK Ciprofloxacin No clinically relevant effect on the exposure of tezacaftor was observed when tezacaftor/ivacaftor was used concomitantly with ciprofloxacin [see Clinical Pharmacology (12.3) ] . Hormonal Contraceptives No clinically significant differences in the pharmacokinetics of ethinyl estradiol/norethindrone containing hormonal contraceptives were observed when used concomitantly with tezacaftor in combinatio …

8 USE IN SPECIFIC POPULATIONS 8.1 Pregnancy Risk Summary There are no available data on ALYFTREK use in pregnant women to evaluate for a drug-associated risk of major birth defects, miscarriage, or other adverse maternal or fetal outcomes. Although there are no animal reproduction studies with the concomitant administration of vanzacaftor, tezacaftor, and deutivacaftor, separate reproductive and developmental studies were conducted with vanzacaftor and tezacaftor in pregnant rats and rabbits. Deutivacaftor is a deuterated isotopologue of ivacaftor with a toxicity profile similar to ivacaftor. Reproductive and development studies were conducted with ivacaftor in pregnant rats and rabbits. In animal embryo fetal development (EFD) studies, oral administration of vanzacaftor to pregnant rats and rabbits during organogenesis demonstrated no adverse developmental effects at doses that produced maternal exposures up to approximately 30 times the exposure at the maximum recommended human dose (MRHD) in rats and 22 times the MRHD in rabbits. Oral administration of tezacaftor to pregnant rats and rabbits during organogenesis demonstrated no adverse developmental effects at doses that produced maternal exposures up to approximately 3 times the exposure at the MRHD in rats and 0.2 times the MRHD in rabbits (based on summed AUCs of tezacaftor and the metabolite M1-TEZ). Oral administration of ivacaftor to pregnant rats and rabbits during organogenesis demonstrated no adverse developmental effects at doses that produced maternal exposures up to approximately 8 and 9 times the exposure at the MRHD, respectively (based on AUC of ivacaftor for rats and rabbits). No adverse developmental effects were observed after oral administration of vanzacaftor, tezacaftor, or ivacaftor to pregnant rats from the period of organogenesis through lactation at doses that produced maternal exposures approximately 18 times, 1 time, and 8 times the exposures at the MRHD, respectively (based on AUCs of vanzacaftor, tezacaftor and M1-TEZ, and ivacaftor) ( see Data ). The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively. Data Animal Data Vanzacaftor : In an EFD study, pregnant rats were administered vanzacaftor at oral doses of 2.5, 5, and 10 mg/kg/day during the period of organogenesis from gestation Days 6-17. Vanzacaftor did not cause adverse effects to the fetus at exposures up to 30 times the MRHD (based on AUC for vanzacaftor at maternal doses up to 10 mg/kg/day). In an EFD study, pregnant rabbits were administered vanzacaftor at oral doses of 10, 40, and 70 mg/kg/day during the period of organogenesis from gestation Days 7-20. Vanzacaftor did not cause adverse effects to the fetus at exposures up to 22 times the MRHD (based on AUC of vanzacaftor at maternal doses up to 40 mg/kg/day). The high dose of 70 mg/kg/day (71 times the exposure at the MRHD) produced maternal toxicity (i.e., mortality, abortion, decreased mean body weight or body weight gains) and was associated with findings of increased post-implantation loss, decreased live fetuses, decreased fetal body weight, and increased kidney malformations. In a pre- and postnatal development (PPND) study in pregnant rats administered vanzacaftor at oral doses of 2.5, 5, and 10 mg/kg/day from gestation Day 6 through lactation Day 18, vanzacaftor did not cause adverse developmental effects in pups at maternal doses up to 10 mg/kg/day (approximately 18 times the exposure at the MRHD). Placental transfer of vanzacaftor was observed in pregnant rats. Tezacaftor: In an EFD study, pregnant rats were administered tezacaftor at oral doses of 25, 50, and 100 mg/kg/day during the period of organogenes …

12.1 Mechanism of Action Vanzacaftor and tezacaftor bind to different sites on the CFTR protein and have an additive effect in facilitating the cellular processing and trafficking of select mutant forms of CFTR (including F508del- CFTR) to increase the amount of CFTR protein delivered to the cell surface compared to either molecule alone. Deutivacaftor potentiates the channel open probability (or gating) of the CFTR protein at the cell surface. The combined effect of vanzacaftor, tezacaftor and deutivacaftor is increased quantity and function of CFTR at the cell surface, resulting in increased CFTR activity as measured both by CFTR-mediated chloride transport in vitro and by sweat chloride in patients with CF. CFTR Chloride Transport Assay in Fischer Rat Thyroid Cells Expressing Mutant CFTR Protein Effects of vanzacaftor/tezacaftor/deutivacaftor on chloride transport for mutant CFTR protein was determined in Ussing chamber electrophysiology studies using a panel of Fischer Rat Thyroid (FRT) cell lines stably expressing CFTR protein from individual variants. Vanzacaftor/tezacaftor/deutivacaftor increased chloride transport in FRT cells expressing select CFTR variants, as identified in Table 5. The threshold that the treatment-induced increase in chloride transport must exceed for the mutant CFTR protein to be considered responsive is ≥10% of normal over baseline. This threshold was used because it is expected to predict clinical benefit. For individual variants, the magnitude of the net change over baseline in CFTR-mediated chloride transport in vitro is not correlated with the magnitude of clinical response. CFTR Chloride Transport Assay in Human Bronchial Epithelial Cells Expressing Mutant CFTR Protein Homozygous and heterozygous N1303K- Human Bronchial Epithelial (HBE) cells showed greater chloride transport in the presence of vanzacaftor/tezacaftor/deutivacaftor than F508del/F508del- HBE cells treated with tezacaftor/ivacaftor which has shown clinical benefit in people homozygous for F508del . Patient Selection Select adult and pediatric patients 6 years of age and older for the treatment of CF with ALYFTREK based on a clinical diagnosis of CF and the presence of at least one variant in the CFTR gene that is either responsive based on clinical and/or in vitro data or results in production of CFTR protein [see Indications and Usage (1) ]. ALYFTREK should only be used in patients with a clinical diagnosis of CF. The presence of eligible CFTR variant(s) should not be the sole determinant for using ALYFTREK. Table 5 lists CFTR variants responsive to ALYFTREK based on clinical and/or in vitro data in FRT or HBE cells [see Clinical Studies (14) ]. Table 5: List of CFTR Gene Variants Responsive to ALYFTREK The list of responsive CFTR variants is non-exhaustive. There may be protein-producing CFTR variants not listed that respond to treatment with ALYFTREK. Based on Clinical Data Clinical data is obtained from Trials 1 and 2. A455E G551D This variant is also predicted to be responsive by FRT assay with ALYFTREK. L1077P R352Q S1251N S945L W1098C D1152H G85E L206W R75Q S549N V562I W1282R F508del H1054D M1101K S1159F S549R V754M Y563N G1244E I336K R1066H Based on in vitro Data The N1303K variant is predicted to be responsive only by HBE assay. All other variants predicted to be responsive with in vitro data are supported by FRT assay. 1140-1151dup D443Y G1265V I1398S M150R R1283M S977F 1461insGAT D443Y;G576A;R668C Complex/compound variants where a single allele of the CFTR gene has multiple variants; these exist independent of the presence of variants on the other allele. G126D I148L M152L R1283S S977F;R1438W 1507_1515del9 D513G G1298V I148N M152V R1438W T1036N 2055del9 D529G G1349D I148T M265R R170H T1053I 2183A→G D565G G149R I148T;H609R M348K R248K T1057R 2851A/G D567N G149R;G576A;R668C I175V M394L R258G T1086A 293A→G D572N G178E I331N M469V R297Q T1086I 3007del6 D579G G178R I336L M498I R31C T1246I 3131del15 D58H G194R I444S M952I R …

11 DESCRIPTION ALYFTREK (vanzacaftor, tezacaftor, and deutivacaftor tablets) are fixed-dose combination tablets for oral use available as: 10 mg of vanzacaftor (equivalent to 10.6 mg of vanzacaftor calcium dihydrate), 50 mg of tezacaftor, 125 mg of deutivacaftor or 4 mg of vanzacaftor (equivalent to 4.24 mg of vanzacaftor calcium dihydrate), 20 mg of tezacaftor, 50 mg of deutivacaftor. The tablets contain the following inactive ingredients: croscarmellose sodium, hypromellose, hypromellose acetate succinate, magnesium stearate, microcrystalline cellulose, and sodium lauryl sulfate. The tablet film coating contains Brilliant Blue FCF aluminum lake/FD&C Blue #1, carmine, hydroxypropyl cellulose, hypromellose, iron oxide red, talc, and titanium dioxide. The active ingredients of ALYFTREK are described below: Vanzacaftor Vanzacaftor is provided as a calcium salt. Vanzacaftor calcium dihydrate is a white solid that is practically insoluble in water (< 0.1 mg/mL). Its chemical name is calcium bis((14 S )-8-[3-(2-{dispiro[2.0.2 4 .1 3 ]heptan-7-yl}ethoxy)pyrazol-1-yl]-12,12-dimethyl-2,2,4-trioxo-2λ 6 -thia-3,9,11,18,23-pentaazatetracyclo[17.3.1.1 11,14 .0 5,10 ]tetracosa-1(23),5,7,9,19,21-hexaen-3-ide) dihydrate. Its molecular formula is C 32 H 38 N 7 O 4 S∙Ca 0.5 ∙H 2 O and its molecular weight is 654.82. Vanzacaftor calcium dihydrate has the following structural formula: Chemical Structure Tezacaftor Tezacaftor is a white to off-white solid that is practically insoluble in water (< 5 microgram/mL). Its chemical name is 1-(2,2-difluoro-2H-1,3-benzodioxol-5-yl)-N-{1-[(2R)-2,3-dihydroxypropyl]-6-fluoro-2-(1-hydroxy-2-methylpropan-2-yl)-1H-indol-5-yl}cyclopropane-1-carboxamide. Its molecular formula is C 26 H 27 N 2 F 3 O 6 and its molecular weight is 520.50. Tezacaftor has the following structural formula: Chemical Structure Deutivacaftor Deutivacaftor is a white to off-white solid that is practically insoluble in water (< 0.1 mg/mL). Pharmacologically, it is a CFTR potentiator. Its chemical name is N -(2-( tert -butyl)-5-hydroxy-4-(2-(methyl- d 3 )propan-2-yl-1,1,1,3,3,3- d 6 )phenyl)-4-oxo-1,4-dihydroquinoline-3-carboxamide. Its molecular formula is C 24 H 19 D 9 N 2 O 3 and its molecular weight is 401.55. Deutivacaftor has the following structural formula: Chemical Structure

10 OVERDOSAGE Treatment of overdosage consists of general supportive measures including monitoring of vital signs and observation of the clinical status.

16 HOW SUPPLIED/STORAGE AND HANDLING ALYFTREK (vanzacaftor, tezacaftor, and deutivacaftor) tablets are supplied as follows: Table 10: ALYFTREK Tablets and Package Configuration Strengths Tablet Description Package Configuration NDC 4 mg of vanzacaftor/ 20 mg of tezacaftor / 50 mg of deutivacaftor purple, round-shaped, film-coated, debossed with "V4" on one side and plain on the other 84-count carton containing 4 wallets, each wallet containing 21 tablets in blister packs NDC 51167-135-01 10 mg of vanzacaftor/ 50 mg of tezacaftor / 125 mg of deutivacaftor purple, oblong-shaped, film-coated, debossed with "V10" on one side and plain on the other 56-count carton containing 4 wallets, each wallet containing 14 tablets in blister packs NDC 51167-121-01 Store at 20°C - 25°C (68°F - 77°F); excursions permitted to 15°C - 30°C (59°F - 86°F) [see USP Controlled Room Temperature].