Elexacaftor

1 INDICATIONS AND USAGE TRIKAFTA is indicated for the treatment of cystic fibrosis (CF) in adult and pediatric patients aged 2 years 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 6 ) 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. TRIKAFTA is a combination of ivacaftor, a CFTR potentiator, tezacaftor, and elexacaftor indicated for the treatment of cystic fibrosis (CF) in adult and pediatric patients aged 2 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 )

12.1 Mechanism of Action Elexacaftor 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. Ivacaftor potentiates the channel open probability (or gating) of the CFTR protein at the cell surface. The combined effect of elexacaftor, tezacaftor and ivacaftor 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 elexacaftor/tezacaftor/ivacaftor on chloride transport for mutant CFTR proteins was determined in Ussing chamber electrophysiology studies using a panel of Fischer Rat Thyroid (FRT) cell lines stably expressing individual mutant CFTR protein. Elexacaftor/tezacaftor/ivacaftor increased chloride transport in FRT cells expressing CFTR variants, as identified in Table 6. 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 elexacaftor/tezacaftor/ivacaftor 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 2 years of age and older for the treatment of CF with TRIKAFTA 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) ] . TRIKAFTA 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 TRIKAFTA. Table 6 lists CFTR variants responsive to TRIKAFTA based on clinical and/or in vitro data in FRT or HBE cells [see Clinical Studies (14) ] . Table 6: List of CFTR Gene Variants Responsive to TRIKAFTA The list of responsive CFTR variants is non-exhaustive. There may be protein-producing CFTR variants not listed that respond to treatment with TRIKAFTA. Variants responsive to TRIKAFTA based on clinical data Clinical data obtained from Trials 1, 2, and 5. 2789+5G→A D1152H This

2 DOSAGE AND ADMINISTRATION Prior to initiating TRIKAFTA 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 2 Years and Older (with fat-containing food ( 2.2 , 12.3 )) Age Weight Morning Dose Evening Dose 2 to less than 6 years Less than 14 kg One packet containing elexacaftor 80 mg/tezacaftor 40 mg/ivacaftor 60 mg oral granules One packet containing ivacaftor 59.5 mg oral granules 14 kg or more One packet containing elexacaftor 100 mg/tezacaftor 50 mg/ivacaftor 75 mg oral granules One packet containing ivacaftor 75 mg oral granules 6 to less than 12 years Less than 30 kg Two tablets, each containing elexacaftor 50 mg/tezacaftor 25 mg/ivacaftor 37.5 mg One tablet of ivacaftor 75 mg 30 kg or more Two tablets, each containing elexacaftor 100 mg/tezacaftor 50 mg/ivacaftor 75 mg One tablet of ivacaftor 150 mg 12 years and older - Two tablets, each containing elexacaftor 100 mg/tezacaftor 50 mg/ivacaftor 75 mg One tablet of ivacaftor 150 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. Reduce dose if used in patients with moderate hepatic impairment. Liver function tests should be closely monitored. ( 2.3 , 5.1 , 6 , 8.7 , 12.3 ) See full prescribing information for dosage modifications due to drug interactions with TRIKAFTA. ( 2.4 , 5.6 , 7.1 , 12.3 ) 2.1 Recommended Laboratory Testing Prior to TRIKAFTA Initiation and During Treatment Prior to initiating TRIKAFTA, 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 or liver function test elevations at baseline [see Warnings and Precautions (5.1) and Use in Specific Populations (8.7) ] . 2.2 Recommended Dosage in Adults and Pediatric Patients Aged 2 Years and Older Recommended dosage for adult and pediatric patients aged 2 years and older is provided in Table 1. Administer TRIKAFTA tablets (swallow the tablets whole) or oral granules orally with fat-containing food, in the morning and in the evening approximately 12 hours apart. 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 [see Clinical Pharmacology (12.3) ] . Administer each dose of TRIKAFTA oral granules immediately before or after ingestion of fat-containing food. Mix entire contents of each packet of oral granules with one teaspoon (5 mL) of age-appropriate soft food or liquid that is at or below room temperature. Some examples of soft food or liquids include pureed fruits or vegetables, yogurt, applesauce, water, milk, or juice. Once mixed, the product should be consumed completely within one hour. Table 1: Recommended Dosage of TRIKAFTA for Adult and Pediatric Patients Aged 2 Years and Older Age Weight Oral Morning Dose Oral Evening Dose 2 to less than 6 years Less than 14 kg One packet (containing elexacaftor 80 mg/tezacaftor 40 mg/ivacaftor 60 mg) oral granules One packet (containing ivacaftor 59.5 mg) oral granules 14 kg or more One packet (containing elexacaftor 100 mg/tezacaftor 50 mg/ivacaftor 75 mg) oral granules One packet (containing ivacaftor 75 mg) oral granules 6 to less than 12 years Less than 30 kg Two tablets of elexacaftor 50 mg/tezacaftor 25 mg/ivacaftor 37.5 mg (total dose of elexacaftor 100 mg/tezacaftor 50 mg/ivacaftor 75 mg) One tablet of ivacaftor 75 mg 30 kg or more Two tablets of elexacaftor 100 mg/tezacaftor 50 mg/ivacaftor

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) ] Intracranial Hypertension [see Warnings and Precautions (5.3) ] Neuropsychiatric Events, Including Suicidal Thoughts and Behaviors [see Warnings and Precautions (5.4) ] Cataracts [see Warnings and Precautions (5.7) ] The most common adverse drug reactions to TRIKAFTA (≥5% of patients and at a frequency higher than placebo by ≥1%) were headache, upper respiratory tract infection, abdominal pain, diarrhea, rash, alanine aminotransferase increased, nasal congestion, blood creatine phosphokinase increased, aspartate aminotransferase increased, rhinorrhea, rhinitis, influenza, sinusitis, blood bilirubin increased and constipation. ( 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. Patients with Cystic Fibrosis with at Least One F508del Variant The safety profile of TRIKAFTA in patients with CF with at least one F508del variant is based on data from 510 patients aged 12 years and older in two double-blind, controlled trials of 24 weeks and 4 weeks treatment duration (Trials 1 and 2, respectively). Eligible patients were also able to participate in an open-label extension safety study (up to 96 weeks of TRIKAFTA). In the two controlled trials, a total of 257 patients aged 12 years and older received at least one dose of TRIKAFTA. In Trial 1, the proportion of patients who discontinued study drug prematurely due to adverse events was 1% for TRIKAFTA-treated patients and 0% for placebo-treated patients. In Trial 1, serious adverse reactions that occurred more frequently in TRIKAFTA-treated patients compared to placebo were rash (1% vs <1%) and influenza (1% vs 0%). There were no deaths. Table 4 shows adverse reactions occurring in ≥5% of TRIKAFTA-treated patients and higher than placebo by ≥1% in the 24-week, placebo-controlled, parallel-group trial (Trial 1). Table 4: Adverse Reactions Occurring in ≥5% of TRIKAFTA-Treated Patients and Higher than Placebo by ≥1% in Trial 1 Adverse Reactions TRIKAFTA N=202 n (%) Placebo N=201 n (%) Headache 35 (17) 30 (15) Upper respiratory tract infection Includes upper respiratory tract infection and viral upper respiratory tract infection. 32 (16) 25 (12) Abdominal pain Includes abdominal pain, abdominal pain upper, abdominal pain lower. 29 (14) 18 (9) Diarrhea 26 (13) 14 (7) Rash Includes rash, rash generalized, rash erythematous, rash macular, rash pruritic. 21 (10) 10 (5) Alanine aminotransferase increased 20 (10) 7 (3) Nasal congestion 19 (9) 15 (7) Blood creatine phosphokinase increased 19 (9) 9 (4) Aspartate aminotransferase increased 19 (9) 4 (2) Rhinorrhea 17 (8) 6 (3) Rhinitis 15 (7) 11 (5) Influenza 14 (7) 3 (1) Sinusitis 11 (5) 8 (4) Blood bilirubin increased 10 (5) 2 (1) Additional adverse reactions that occurred in TRIKAFTA-treated patients at a frequency of 2% to <5% and higher than placebo by ≥1% include the following: flatulence, abdominal distension, conjunctivitis, pharyngitis, respiratory tract infection, tonsillitis, urinary tract infection, C-reactive protein increased, hypoglycemia, dizziness, dysmenorrhea, acne, eczema and pruritus. In addition, the following clinical trials have also been conducted [see Use in Specific Populations (8.4) , Clinical Pharmacology (12.3) and Clinical Studies (14) ]: a 24-week, open-label trial in 66 patients with CF aged 6 to less than 1

5 WARNINGS AND PRECAUTIONS Drug-induced liver injury and liver failure : TRIKAFTA can cause serious and potentially fatal drug-induced liver injury. Assess liver function tests (ALT, AST, alkaline phosphatase, bilirubin) in all patients prior to initiating and throughout treatment with TRIKAFTA. Interrupt TRIKAFTA in the event of significant elevations in liver function tests or signs or symptoms of liver injury. TRIKAFTA should not be used in patients with severe hepatic impairment (Child-Pugh Class C). TRIKAFTA is not recommended in patients with moderate hepatic impairment (Child-Pugh Class B). ( 2.1 , 2.3 , 5.1 , 6 , 8.7 , 12.3 ) Hypersensitivity reactions : Angioedema and anaphylaxis have been reported with TRIKAFTA in the postmarketing setting. Initiate appropriate therapy in the event of a hypersensitivity reaction. ( 5.2 ) Intracranial hypertension : Intracranial hypertension (IH) has been reported in the postmarketing setting with the use of TRIKAFTA. If an unusual headache or visual disturbances occur during treatment, and IH is suspected, interrupt TRIKAFTA and refer for prompt medical evaluation. ( 5.3 ) Neuropsychiatric events, including suicidal thoughts and behaviors : Serious neuropsychiatric events, including symptoms of anxiety, depression, suicidal ideation and behavior, and sleep disturbances, have been reported in the postmarketing setting for TRIKAFTA or drugs containing the same or similar active ingredients. Monitor patients closely for new or worsening symptoms. Consider the risks and benefits for the individual patient to determine if therapy with TRIKAFTA should be interrupted at the occurrence of neuropsychiatric symptoms. ( 5.4 ) Use with CYP3A inducers : Concomitant use with strong CYP3A inducers (e.g., rifampin, St. John's wort) significantly decrease ivacaftor exposure and are expected to decrease elexacaftor and tezacaftor exposure, which may reduce TRIKAFTA efficacy. Therefore, concomitant use is not recommended. ( 5.5 , 7.1 , 12.3 ) Cataracts : Non-congenital lens opacities/cataracts have been reported in pediatric patients treated with ivacaftor-containing regimens. Baseline and follow-up examinations are recommended in pediatric patients initiating TRIKAFTA treatment. ( 5.7 , 8.4 ) 5.1 Drug-Induced Liver Injury and Liver Failure TRIKAFTA can cause serious and potentially fatal drug-induced liver injury. Cases of liver failure leading to transplantation and death have been reported in patients with and without a history of liver disease taking TRIKAFTA, in both clinical trials and the postmarketing setting [see Adverse Reactions (6) ] . Liver injury has been reported within the first month of therapy and up to 15 months following initiation of TRIKAFTA. Assess liver function tests (ALT, AST, alkaline phosphatase, and bilirubin) in all patients prior to initiating TRIKAFTA. Assess 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 or liver function test elevations at baseline [see Dosage and Administration (2.1) , Adverse Reactions (6) , and Use in Specific Populations (8.7) ] . Interrupt TRIKAFTA in the event of signs or symptoms of liver injury. These may include: Significant elevations in liver function tests (e.g., ALT or AST >5 × the upper limit of normal (ULN) or ALT or AST >3 × ULN with bilirubin >2 × ULN) Clinical symptoms suggestive of liver injury (e.g., jaundice, right upper quadrant pain, nausea, vomiting, altered mental status, ascites). Consider referral to a hepatologist and follow patients closely with clinical and laboratory monitoring until abnormalities resolve. If abnormalities resolve and if the benefit is expected to outweigh the risk, resume TRIKAFTA treatment with close monitoring. TRIKAFTA should not be used in patients with severe hepatic impairment (Child-Pugh Class C). TRIKAFTA is not rec

4 CONTRAINDICATIONS None. None. ( 4 )

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