2.1 General Dosage Information

Swallow the tablets whole.

SYMDEKO should be taken with fat-containing food, such as food recommended in standard nutritional guidelines. Examples of meals or snacks that contain fat are those prepared with butter or oils or those containing eggs, cheeses, nuts, whole milk, or meats, etc. [see Clinical Pharmacology (12.3)].

2.2 Recommended Dosage in Adults, Adolescents, and Children Aged 6 Years and Older

Adults, adolescents, and children aged 6 years and older should be dosed according to Table 1. The morning and the evening doses should be taken approximately 12 hours apart.

2.3 Recommended Dosage for Patients with Hepatic Impairment

For dosage adjustment for patients with hepatic impairment, refer to Table 2.

Studies have not been conducted in patients with severe hepatic impairment (Child-Pugh Class C), but exposure of tezacaftor and ivacaftor is expected to be higher than in patients with moderate hepatic impairment. Therefore, SYMDEKO should be used with caution at an adjusted dosage after weighing the risks and benefits of treatment in these patients [see Use in Specific Populations (8.6), Clinical Pharmacology (12.3), and Patient Counseling Information (17)].

2.4 Dosage Adjustment for Patients Taking Drugs that are CYP3A Inhibitors

The dosing regimen of SYMDEKO should be adjusted when co-administered with moderate and strong CYP3A inhibitors.

5.1 Transaminase (AST/ALT) Elevations

Elevated transaminases have been observed in patients with CF treated with SYMDEKO, as well as with ivacaftor monotherapy. Assessments of transaminases (ALT and AST) are recommended for all patients prior to initiating SYMDEKO, every 3 months during the first year of treatment, and annually thereafter. For patients with a history of transaminase elevations more frequent monitoring should be considered. In the event of significant elevations of transaminases, e.g., patients with ALT or AST >5 × upper limit of normal (ULN), or ALT or AST >3 × ULN with bilirubin >2 × ULN, dosing should be interrupted and laboratory tests closely followed until the abnormalities resolve. Following the resolution of transaminase elevations consider the benefits and risks of resuming treatment [see Adverse Reactions (6)].

5.2 Hypersensitivity Reactions, Including Anaphylaxis

Hypersensitivity reactions, including cases of anaphylaxis, have been reported in the postmarketing setting [see Adverse Reactions (6.2)]. If signs or symptoms of serious hypersensitivity reactions develop during treatment, discontinue SYMDEKO and institute appropriate therapy. Consider the benefits and risks for the individual patient to determine whether to resume treatment with SYMDEKO.

5.3 Concomitant Use with CYP3A Inducers

Exposure to ivacaftor is significantly decreased and exposure to tezacaftor may be reduced by the concomitant use of CYP3A inducers, which may reduce the therapeutic effectiveness of SYMDEKO. Therefore, co-administration with strong CYP3A inducers is not recommended [see Drug Interactions (7.1), Clinical Pharmacology (12.3), and Patient Counseling Information (17)].

5.4 Cataracts

Cases of non-congenital lens opacities have been reported in pediatric patients treated with SYMDEKO, as well as with ivacaftor monotherapy. Although other risk factors were present in some cases (such as corticosteroid use, exposure to radiation), a possible risk attributable to treatment with SYMDEKO cannot be excluded. Baseline and follow-up ophthalmological examinations are recommended in pediatric patients initiating treatment with SYMDEKO [see Use in Specific Populations (8.4) and Patient Counseling Information (17)].

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 overall safety profile of SYMDEKO is based on data from 1001 patients in three double-blind, placebo-controlled, clinical trials: two parallel-group trials of 12 and 24-week duration and one cross-over design trial of 8 weeks duration. Eligible patients were also able to participate in an open-label extension safety study (up to 96 weeks of SYMDEKO). In the three placebo-controlled trials (Trials 1, 2, and 3), a total of 496 patients with CF aged 12 years and older received at least one dose of SYMDEKO. The proportion of patients who discontinued study drug prematurely due to adverse reactions was 1.6% for SYMDEKO-treated patients and 2.0% for placebo-treated patients. Serious adverse reactions, whether considered drug-related or not by the investigators, that occurred more frequently in SYMDEKO-treated patients compared to placebo included distal intestinal obstruction syndrome, 3 (0.6%) SYMDEKO-treated patients vs. 0 placebo. There were no deaths in the placebo-controlled trials, and one death in the open-label extension study due to respiratory failure and influenza infection in a patient who had discontinued SYMDEKO seven weeks prior.

The safety profile of SYMDEKO was generally similar across all subgroups of patients, including analysis by age, sex, baseline percent predicted FEV1 (ppFEV1), and geographic regions.

Table 5 shows adverse reactions occurring in ≥3% of SYMDEKO-treated patients that also occurred at a higher rate than in the placebo-treated patients in the 12- and 24-week placebo-controlled, parallel-group trials (Trials 1 and 3).

The safety data from the following trials are similar to that observed in Trials 1 and 3:

• an 8-week randomized, double-blind, placebo-controlled crossover study in 244 patients with CF aged 12 years and older who were heterozygous for the F508del mutation and a second mutation predicted to be responsive to tezacaftor/ivacaftor (Trial 2).
• a 24-week open-label study in 70 patients with CF aged 6 to less than 12 years who were either homozygous for the F508del mutation or heterozygous for the F508del mutation and a second mutation predicted to be responsive to tezacaftor/ivacaftor (Trial 4).

6.2 Postmarketing Experience

The following adverse reactions have been identified during post approval use of SYMDEKO. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Immune System Disorders: anaphylaxis

Skin: rash

7.1 Inducers of CYP3A

Tezacaftor and ivacaftor are substrates of CYP3A (ivacaftor is a sensitive substrate of CYP3A). Concomitant use of CYP3A inducers may result in reduced exposures and thus reduced SYMDEKO efficacy. Co-administration of ivacaftor with rifampin, a strong CYP3A inducer, significantly decreased ivacaftor exposure (area under the curve [AUC]) by 89%. Tezacaftor exposures can also be expected to decrease significantly during co-administration with strong CYP3A inducers. Therefore, co-administration of SYMDEKO with strong CYP3A inducers is not recommended [see Warnings and Precautions (5.3), Clinical Pharmacology (12.3), and Patient Counseling Information (17)].

Examples of strong CYP3A inducers include:

• rifampin, rifabutin, phenobarbital, carbamazepine, phenytoin, and St. John's wort (Hypericum perforatum)

7.2 Inhibitors of CYP3A

Co-administration with itraconazole, a strong CYP3A inhibitor, increased tezacaftor exposure (AUC) by 4.0-fold and ivacaftor by 15.6-fold. When co-administered with strong CYP3A inhibitors, the dosing regimen of SYMDEKO should be adjusted [see Dosage and Administration (2.4), Clinical Pharmacology (12.3), and Patient Counseling Information (17)].

Examples of strong CYP3A inhibitors include:

• ketoconazole, itraconazole, posaconazole, and voriconazole
• telithromycin and clarithromycin

Co-administration of fluconazole increased ivacaftor exposure (AUC) by 3.0-fold. Simulation suggested co-administration with fluconazole, a moderate CYP3A inhibitor, may increase tezacaftor exposure (AUC) by approximately 2.0-fold. When co-administered with moderate CYP3A inhibitors, the dosing regimen of SYMDEKO should be adjusted [see Dosage and Administration (2.4), Clinical Pharmacology (12.3), and Patient Counseling Information (17)].

Examples of moderate CYP3A inhibitors include:

• fluconazole
• erythromycin

Co-administration of SYMDEKO with grapefruit juice, which contains one or more components that moderately inhibit CYP3A, may increase exposure of tezacaftor and ivacaftor; therefore, food or drink containing grapefruit should be avoided during treatment with SYMDEKO [see Dosage and Administration (2.4), Clinical Pharmacology (12.3), and Patient Counseling Information (17)].

7.3 Ciprofloxacin

Co-administration of SYMDEKO with ciprofloxacin had no significant effect on the exposure of tezacaftor or ivacaftor. Therefore, no dosage adjustment is necessary during concomitant administration of SYMDEKO with ciprofloxacin [see Clinical Pharmacology (12.3)].

Potential for tezacaftor/ivacaftor to affect other drugs

7.4 CYP3A Substrates

Co-administration of SYMDEKO with midazolam (oral), a sensitive CYP3A substrate, did not affect midazolam exposure. No dosage adjustment of CYP3A substrates is required when co-administered with SYMDEKO [see Clinical Pharmacology (12.3)].

7.5 CYP2C9 Substrates

Ivacaftor may inhibit CYP2C9; therefore, monitoring of the international normalized ratio (INR) during co-administration of SYMDEKO with warfarin is recommended. Other medicinal products for which exposure may be increased by SYMDEKO include glimepiride and glipizide; these medicinal products should be used with caution [see Clinical Pharmacology (12.3)].

7.6 Digoxin and Other P-gp Substrates

Co-administration of SYMDEKO with digoxin, a sensitive P-gp substrate, increased digoxin exposure by 1.3-fold consistent with weak inhibition of P-gp by ivacaftor. Administration of SYMDEKO may increase systemic exposure of medicinal products that are sensitive substrates of P-gp, which may increase or prolong their therapeutic effect and adverse reactions. When used concomitantly with digoxin or other substrates of P-gp with a narrow therapeutic index such as cyclosporine, everolimus, sirolimus, and tacrolimus, caution and appropriate monitoring should be used [see Clinical Pharmacology (12.3)].

7.7 Hormonal Contraceptives

SYMDEKO has been studied with an ethinyl estradiol/norethindrone oral contraceptive and was found to have no significant effect on the exposures of the hormonal contraceptive. SYMDEKO is not expected to modify the efficacy of hormonal contraceptives [see Clinical Pharmacology (12.3)].

8.1 Pregnancy

8.2 Lactation

8.4 Pediatric Use

The safety and effectiveness of SYMDEKO for the treatment of CF have been established in pediatric patients aged 6 to less than 18 years who are homozygous for the F508del mutation or who have at least one mutation in the CFTR gene that is responsive to tezacaftor/ivacaftor based on in vitro data and/or clinical evidence [see Clinical Pharmacology (12.1) and Clinical Studies (14)].

Clinical trials included the following patients with CF:

• 12 to less than 18 years of age who are homozygous for the F508del mutation [see Adverse Reactions (6) and Clinical Studies (14)].
• 12 to less than 18 years of age who are heterozygous for the F508del mutation and a second mutation predicted to be responsive to tezacaftor/ivacaftor [see Adverse Reactions (6) and Clinical Studies (14)].
• 6 to less than 12 years of age who are either homozygous for the F508del mutation or heterozygous for the F508del mutation and a second mutation predicted to be responsive to tezacaftor/ivacaftor [see Adverse Reactions (6) and Clinical Pharmacology (12)].

The effectiveness of SYMDEKO in patients aged 6 to less than 12 years was extrapolated from patients aged 12 years and older with support from population pharmacokinetic analyses showing similar tezacaftor and ivacaftor exposure levels in patients aged 6 to less than 12 years and in patients aged 12 years and older [see Clinical Pharmacology (12.3)]. Safety of SYMDEKO in this population was derived from a 24-week, open-label, clinical trial in 70 patients aged 6 to less than 12 years (mean age at screening 8.1 years) administered either tezacaftor 50 mg/ivacaftor 75 mg and ivacaftor 75 mg or tezacaftor 100 mg/ivacaftor 150 mg and ivacaftor 150 mg, 12 hours apart (Trial 4). The safety profile for patients in this trial was similar to that observed in Trials 1 and 3 [see Adverse Reactions (6.1)].

The safety and effectiveness of SYMDEKO in patients with CF younger than 6 years of age have not been studied.

8.5 Geriatric Use

Clinical trials of SYMDEKO did not include sufficient numbers of patients 65 years of age and over to determine whether they respond differently from younger patients.

8.6 Hepatic Impairment

No dosage adjustment is necessary for patients with mild hepatic impairment (Child-Pugh Class A). A reduced dosage of SYMDEKO is recommended in patients with moderate hepatic impairment (Child-Pugh Class B). There is no experience in patients with severe hepatic impairment (Child-Pugh Class C), but tezacaftor/ivacaftor exposure is expected to be higher than in patients with moderate hepatic impairment. Therefore, use with caution at a reduced dosage in patients with severe hepatic impairment after weighing the risks and benefits of treatment [see Dosage and Administration (2.3), Clinical Pharmacology (12.3), and Patient Counseling Information (17)].

8.7 Renal Impairment

SYMDEKO has not been studied in patients with moderate or severe renal impairment or in patients with end-stage renal disease. No dosage adjustment is recommended for mild and moderate renal impairment. Caution is recommended in patients with severe renal impairment or end-stage renal disease [Clinical Pharmacology (12.3)].

8.8 Patients with Severe Lung Dysfunction

Trial 1 and Trial 2 included a total of 39 SYMDEKO-treated patients with ppFEV1 <40 at baseline (range: 30-40); 23 patients in Trial 1 and 16 patients in Trial 2. There were 24 placebo-treated patients in Trial 1, and 15 placebo- and 13 ivacaftor-treated patients in Trial 2, with ppFEV1 <40 at baseline. The safety and efficacy in this subgroup were comparable to the overall results observed in both Trials 1 and 2.

Tezacaftor 50 mg/ivacaftor 75 mg fixed-dose combination tablets and ivacaftor 75 mg tablets:

The tezacaftor/ivacaftor fixed-dose combination tablet is available as a white, oblong-shaped, film-coated tablet containing 50 mg of tezacaftor, 75 mg of ivacaftor, and the following inactive ingredients: croscarmellose sodium, hypromellose, hypromellose acetate succinate, magnesium stearate, microcrystalline cellulose and sodium lauryl sulfate. The tablet film coat contains HPMC/hypromellose 2910, hydroxypropyl cellulose, talc and titanium dioxide.

The ivacaftor tablet is available as a light blue, oblong-shaped, film-coated tablet containing 75 mg of ivacaftor and the following inactive ingredients: colloidal silicon dioxide, croscarmellose sodium, hypromellose acetate succinate, lactose monohydrate, magnesium stearate, microcrystalline cellulose, and sodium lauryl sulfate. The tablet film coat contains carnauba wax, FD&C Blue #2, PEG 3350, polyvinyl alcohol, talc, and titanium dioxide. The printing ink contains ammonium hydroxide, iron oxide black, propylene glycol, and shellac.

Tezacaftor 100 mg/ivacaftor 150 mg fixed-dose combination tablets and ivacaftor 150 mg tablets:

The tezacaftor/ivacaftor fixed-dose combination tablet is available as a yellow, oblong-shaped, film-coated tablet containing 100 mg of tezacaftor, 150 mg of ivacaftor, and the following inactive ingredients: croscarmellose sodium, hypromellose, hypromellose acetate succinate, magnesium stearate, microcrystalline cellulose and sodium lauryl sulfate. The tablet film coat contains HPMC/hypromellose 2910, hydroxypropyl cellulose, iron oxide yellow, talc and titanium dioxide.

The ivacaftor tablet is available as a light blue, oblong-shaped, film-coated tablet containing 150 mg of ivacaftor and the following inactive ingredients: colloidal silicon dioxide, croscarmellose sodium, hypromellose acetate succinate, lactose monohydrate, magnesium stearate, microcrystalline cellulose, and sodium lauryl sulfate. The tablet film coat contains carnauba wax, FD&C Blue #2, PEG 3350, polyvinyl alcohol, talc, and titanium dioxide. The printing ink contains ammonium hydroxide, iron oxide black, propylene glycol, and shellac.

The active ingredients of SYMDEKO are described below.

Tezacaftor

Tezacaftor is a white to off-white powder that is practically insoluble in water (<5 microgram/mL). Its chemical name of tezacaftor 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)-1Hindol-5-yl}cyclopropane-1-carboxamide. Its molecular formula is C26H27N2F3O6 and its molecular weight is 520.50. Tezacaftor has the following structural formula:

Ivacaftor

Ivacaftor is a white to off-white powder that is practically insoluble in water (<0.05 microgram/mL). Pharmacologically it is a CFTR potentiator. Its chemical name is N-(2,4-di-tert-butyl-5-hydroxyphenyl)-1,4-dihydro-4-oxoquinoline-3-carboxamide. Its molecular formula is C24H28N2O3 and its molecular weight is 392.49. Ivacaftor has the following structural formula:

12.1 Mechanism of Action

Tezacaftor facilitates the cellular processing and trafficking of select mutant forms of CFTR (including F508del-CFTR) to increase the amount of mature CFTR protein delivered to the cell surface. Ivacaftor is a CFTR potentiator that facilitates increased chloride transport by potentiating the channel-open probability (or gating) of the CFTR protein at the cell surface. For ivacaftor to function CFTR protein must be present at the cell surface. Ivacaftor can potentiate the CFTR protein delivered to the cell surface by tezacaftor, leading to a further enhancement of chloride transport than either agent alone. The combined effect of tezacaftor and ivacaftor is increased quantity and function of CFTR at the cell surface, resulting in increases in chloride transport.

12.2 Pharmacodynamics

12.3 Pharmacokinetics

The pharmacokinetics of tezacaftor and ivacaftor are similar between healthy adult volunteers and patients with CF. Following once-daily dosing of tezacaftor and twice-daily dosing of ivacaftor in patients with CF, plasma concentrations of tezacaftor and ivacaftor reach steady-state within 8 days and within 3 to 5 days, respectively, after starting treatment. At steady-state, the accumulation ratio is approximately 1.5 for tezacaftor and 2.2 for ivacaftor. Exposures of tezacaftor (administered alone or in combination with ivacaftor) increase in an approximately dose-proportional manner with increasing doses from 10 mg to 300 mg once daily.

Key pharmacokinetic parameters for tezacaftor and ivacaftor at steady state are shown in Table 7.

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

No studies of carcinogenicity, mutagenicity, or impairment of fertility were conducted with the combination of tezacaftor and ivacaftor, however, separate studies of tezacaftor and ivacaftor are described below.

Dose Ranging:

Dose selection for the clinical program primarily consisted of one double-blind, placebo-controlled, multiple-cohort trial which included 176 patients with CF (homozygous for the F508del mutation) 18 years of age and older with a screening ppFEV1≥40. In the study, 34 and 106 patients, respectively, received tezacaftor at once-daily doses of 10 mg, 30 mg, 100 mg, or 150 mg alone or in combination with ivacaftor 150 mg q12h, and 33 patients received placebo. During the 28-day treatment period, dose-dependent increases in mean ppFEV1 change from baseline were observed with tezacaftor in combination with ivacaftor. Tezacaftor/ivacaftor in general had a greater mean treatment effect than tezacaftor alone. No additional benefit was observed at tezacaftor doses greater than 100 mg daily.

Efficacy:

The efficacy of SYMDEKO in patients with CF aged 12 years and older was evaluated in three double-blind, placebo-controlled trials (Trials1, 2, and 3).

Trial 1 was a 24-week randomized, double-blind, placebo-controlled, two-arm study in patients with CF who were homozygous for the F508del mutation in the CFTR gene.

Trial 2 was a randomized, double-blind, placebo-controlled, 2-period, 3-treatment, 8-week crossover study in patients with CF who were heterozygous for the F508del mutation and a second mutation predicted to be responsive to tezacaftor/ivacaftor. Mutations predicted to be responsive were selected for the study based on the clinical phenotype (pancreatic sufficiency), biomarker data (sweat chloride), and in vitro responsiveness to tezacaftor/ivacaftor [see Clinical Studies (14.2)]. Patients were randomized to and received sequences of treatment that included SYMDEKO, ivacaftor, and placebo.

Trial 3 was a 12-week randomized, double-blind, placebo-controlled, two-arm study in patients with CF who were heterozygous for the F508del mutation and a second CFTR mutation predicted to be unresponsive to tezacaftor/ivacaftor. Mutations predicted to be non-responsive were selected for the study based on biologic plausibility (mutation class), clinical phenotype (pancreatic insufficiency), biomarker data (sweat chloride), and in vitro testing to tezacaftor and/or ivacaftor.

Patients in all trials continued on their standard-of-care CF therapies (e.g., bronchodilators, inhaled antibiotics, dornase alfa, and hypertonic saline) and were eligible to roll over into a 96-week open-label extension. Patients had a ppFEV1 at screening between 40-90%. Patients with a history of colonization with organisms associated with a more rapid decline in pulmonary status such as Burkholderia cenocepacia, Burkholderia dolosa, or Mycobacterium abscessus, or who had 2 or more abnormal liver function tests at screening (ALT, AST, AP, GGT ≥3 × ULN or total bilirubin ≥2 × ULN) or AST or ALT ≥5 × ULN, were excluded from the trials.

14.1 Trial in Patients with CF Who Were Homozygous for the F508del Mutation in the CFTR Gene (Trial 1)

Trial 1 evaluated 504 patients (248 SYMDEKO, 256 placebo) with CF aged 12 years and older (mean age 26.3 years). The mean ppFEV1 at baseline was 60.0% (range: 27.8% to 96.2%). The primary efficacy endpoint was change in lung function as determined by absolute change from baseline in ppFEV1 through Week 24. Treatment with SYMDEKO resulted in a statistically significant improvement in ppFEV1. The treatment difference between SYMDEKO and placebo for the mean absolute change in ppFEV1 from baseline through Week 24 was 4.0 percentage points (95% CI: 3.1, 4.8; P<0.0001). These changes persisted throughout the 24-week treatment period (Figure 1). Improvements in ppFEV1 were observed regardless of age, sex, baseline ppFEV1, colonization with Pseudomonas, concomitant use of standard-of-care medications for CF, and geographic region.

Key secondary efficacy variables included relative change from baseline in ppFEV1 through Week 24; number of pulmonary exacerbations from baseline through Week 24; absolute change in BMI from baseline at Week 24, and absolute change in CFQ-R Respiratory Domain Score (a measure of respiratory symptoms relevant to patients with CF, such as cough, sputum production, and difficulty breathing) from baseline through Week 24. For the purposes of this trial, a pulmonary exacerbation was defined as a change in antibiotic therapy (IV, inhaled, or oral) as a result of 4 or more of 12 pre-specified sino-pulmonary signs/symptoms. See Table 11 for a summary of key secondary outcomes in Trial 1.

Figure 1: Absolute Change From Baseline in Percent Predicted FEV1 at Each Visit in Trial 1

14.2 Trial in Patients with CF Who Were Heterozygous for the F508del Mutation and a Second Mutation Predicted to be Responsive to Tezacaftor/Ivacaftor (Trial 2)

Trial 2 evaluated 244 patients with CF aged 12 years and older (mean age 34.8 years). The mean ppFEV1 at baseline was 62.3% (range: 34.6 to 93.5). Of the 244 patients included in the efficacy analysis, 146 patients had a splice mutation and 98 patients had a missense mutation as the second allele. 161 patients received SYMDEKO, 156 patients received ivacaftor, and 161 patients received placebo. The primary efficacy endpoint was the mean absolute change from study baseline in percent predicted FEV1 averaged at Weeks 4 and 8 of treatment. The key secondary efficacy endpoint was absolute change in CFQ-R Respiratory Domain Score from study baseline averaged at Weeks 4 and 8 of treatment. For the overall population, treatment with SYMDEKO compared to placebo resulted in significant improvement in ppFEV1 (6.8 percentage points [95% CI: 5.7, 7.8]; P<0.0001) and CFQ-R Respiratory Domain Score (11.1 points (95% CI: 8.7, 13.6); P<0.0001). Treatment difference for ppFEV1 between ivacaftor- and placebo-treated patients was 4.7 percentage points (95% CI: 3.7, 5.8; P<0.0001) and 2.1 percentage points (95% CI: 1.2, 2.9; P<0.0001) between SYMDEKO- and ivacaftor-treated patients, which were statistically significant. Improvements in ppFEV1 were observed regardless of age, baseline ppFEV1, sex, mutation class, colonization with Pseudomonas, concomitant use of standard-of-care medications for CF, and geographic region. Statistically significant improvements compared to placebo were also observed in the subgroup of patients with splice mutations and missense mutations (Table 12).

In an analysis of BMI at Week 8, an exploratory endpoint, patients treated with SYMDEKO had a mean improvement of 0.2 kg/m2 (95% CI [0.0, 0.3]), 0.1 kg/m2 (95% CI [-0.1, 0.3]), and 0.3 kg/m2 (95% CI [0.1, 0.5]) versus placebo for the overall, splice, and missense mutation populations of patients, respectively.

14.3 Trial in Patients with CF Who Were Heterozygous for the F508del Mutation and a Second Mutation Not Predicted to be Responsive to Tezacaftor/Ivacaftor (Trial 3)

Trial 3 evaluated 168 patients with CF (83 SYMDEKO and 85 placebo) aged 12 years and older (mean age 26.1 years) who were heterozygous for the F508del mutation and had a second CFTR mutation predicted to be unresponsive to tezacaftor/ivacaftor. CF patients with the F508del mutation and one of the following mutations in the CFTR gene were enrolled in the study (listed in decreasing frequency): W1282X, G542X, N1303K, 621+1G>T, 1717-1G>A, 1898+1G>A, CFTRdele2,3, 2183delAA>G, 2184insA, R1162X, R553X, 3659delC, 3905insT, G970R, I507del, R1066C, R347P, 1154insTC, 1811+1.6kbA>G, 2184delA, 405+1G>A, E60X, G85E, L1077P, Q39X, S466X, Y1092X, 1078delT, 1248+1G>A, 1677delTA, 1812-1G>A, 2869INSG, 3120+1G>A, 394delTT, 457TAT>G, 711+1G>T, 711+5G>A, 712-1G>T, G673x, L1065P, Q220X, Q493X, R709X, V520F. The mean ppFEV1 at baseline was 57.5% [range: 31.0 to 96.7]. The primary efficacy endpoint was changed from baseline in absolute ppFEV1 through Week 12. The overall treatment difference between SYMDEKO and placebo for the mean absolute change in ppFEV1 from baseline through Week 12 was 1.2 percentage points (95% CI: -0.3, 2.6). This study was terminated following the planned interim analysis because the pre-specified futility criteria were met.

Store at 68°F to 77°F (20°C to 25°C); excursions permitted to 59°F to 86°F (15°C to 30°C) [see USP Controlled Room Temperature].

Transaminase (ALT or AST) Elevations and Monitoring

Inform patients that elevation in liver tests has occurred in patients treated with SYMDEKO or with ivacaftor alone. Transaminases (ALT and AST) should be assessed prior to initiating SYMDEKO, every 3 months during the first year of treatment, and annually thereafter. More frequent monitoring should be considered in patients with a history of transaminase elevations [see Warnings and Precautions (5.1)].

Hypersensitivity Reactions, Including Anaphylaxis

Hypersensitivity reactions including anaphylaxis are possible with use of SYMDEKO. Inform patients of the early signs of hypersensitivity reactions including rash, hives, itching, facial swelling, tightness of the chest and wheezing. Advise patients to discontinue use of SYMDEKO immediately and contact their physician or go to the emergency department if these symptoms occur.

Drug Interactions with CYP3A Inducers and Inhibitors

Ask patients to tell you all the medications they are taking including any herbal supplements or vitamins. Co-administration of SYMDEKO with strong CYP3A inducers (e.g., rifampin, St. John's wort) is not recommended, as they may reduce the therapeutic effectiveness of SYMDEKO. Adjustment of the dosage to one tablet of tezacaftor/ivacaftor twice a week, taken approximately 3 to 4 days apart is recommended when co-administered with strong CYP3A inhibitors, such as ketoconazole. Advise the patient not to take the evening dose of ivacaftor. Dosage reduction to one tablet of tezacaftor/ivacaftor or ivacaftor, taken on alternate days in the morning is recommended when co-administered with moderate CYP3A inhibitors, such as fluconazole. Advise the patient not to take the evening dose of ivacaftor. Food or drink containing grapefruit should be avoided [see Warnings and Precautions (5.3), Drug Interactions (7), and Clinical Pharmacology (12.3)].

Cataracts

Inform patients that abnormality of the eye lens (cataract) has been noted in some children and adolescents receiving SYMDEKO or with ivacaftor alone. Baseline and follow-up ophthalmological examinations should be performed in pediatric patients initiating treatment with SYMDEKO [see Warnings and Precautions (5.4)].

Use in Patients with Hepatic Impairment

Inquire and/or assess whether patients have liver impairment. Adjust the dosage in patients with moderately impaired hepatic function (Child-Pugh Class B, score 7-9) to one tablet of tezacaftor/ivacaftor once daily in the morning and advise the patient not to take the evening dose of ivacaftor. SYMDEKO has not been studied in patients with severe hepatic impairment (Child-Pugh Class C, score 10-15); however, exposure is expected to be substantially higher than that observed in patients with moderate hepatic impairment. When benefits are expected to outweigh the risks, SYMDEKO should be used with caution in patients with severe hepatic impairment at a dosage of one tablet of tezacaftor/ivacaftor once daily in the morning or less frequently. Advise the patient not to take the evening dose of ivacaftor. No dosage adjustment is recommended for patients with mild hepatic impairment (Child-Pugh Class A, score 5-6) [see Dosage and Administration (2.3), Use in Specific Populations (8.6), and Clinical Pharmacology (12.3)].

Driving and Operating Machinery

Dizziness has been reported in patients receiving SYMDEKO, which could influence the ability to drive or operate machines [see Adverse Reactions (6.1)]. Advise patients not to drive or operate machines if they experience dizziness until symptoms abate.

Administration

Inform patients that SYMDEKO is best absorbed by the body when taken with food that contains fat. A typical CF diet will satisfy this requirement. Examples include eggs, butter, peanut butter, cheese pizza, whole-milk dairy products (such as whole milk, cheese, and yogurt), etc. [see Dosage and Administration (2.1) and Clinical Pharmacology (12.3)].

Patients should be informed about what to do in the event they miss a dose of SYMDEKO or ivacaftor:

• If 6 hours or less have passed since the time SYMDEKO is usually taken, patients should be instructed to take the prescribed dose of SYMDEKO with fat-containing food as soon as possible.
• If more than 6 hours have passed since the time SYMDEKO is usually taken, the missed dose should NOT be taken, and the patient should resume the recommended dosing schedule.
• Patients should be advised to contact their health care provider if they have questions.