LAROTRECTINIB: 798 Adverse Event Reports & Safety Profile

Larotrectinib is a kinase inhibitor. VITRAKVI (larotrectinib) capsules and oral solution are formulated using larotrectinib sulfate. The molecular formula for larotrectinib sulfate is C 21 H 24 F 2 N 6 O 6 S and the molecular weight is 526.51 g/mol for the sulfate salt and 428.44 g/mol for the free base. The chemical name is (3 S )- N -{5-[(2 R )-2-(2,5-difluorophenyl)-1-pyrrolidinyl]pyrazolo[1,5-a]pyrimidin-3-yl}-3-hydroxy-1-pyrrolidinecarboxamide sulfate. Larotrectinib sulfate has the following chemical structure: Larotrectinib sulfate is an off-white to pinkish yellow solid that is not hygroscopic. The aqueous solubility of larotrectinib at 37°C is pH dependent (very soluble at pH 1.0 and freely soluble at pH 6.8, according to USP descriptive terms of solubility). VITRAKVI (larotrectinib) capsules and oral solution are for oral use. Each capsule contains 25 mg or 100 mg larotrectinib (30.7 mg and 123 mg larotrectinib sulfate, respectively) in a hard gelatin capsule. The capsule is composed of gelatin, titanium dioxide, and edible ink. The oral solution packaged in one bottle containing 100 mL contains 20 mg/mL larotrectinib (24.6 mg/mL larotrectinib sulfate) and the following inactive ingredients: purified water, hydroxypropyl betadex, sucrose, glycerin, sorbitol, citric acid, sodium phosphate, sodium citrate dihydrate, propylene glycol and flavoring. Preserved with methylparaben and potassium sorbate. The oral solution packaged in two bottles each containing 50 mL contains 20 mg/mL larotrectinib (24.6 mg/mL larotrectinib sulfate) and the following inactive ingredients: purified water, hydroxypropyl betadex, sucralose, sodium citrate, strawberry flavor, and citric acid. Preserved with sodium benzoate.

Chemical

Structure

AND USAGE VITRAKVI is indicated for the treatment of adult and pediatric patients with solid tumors that:

• have a neurotrophic receptor tyrosine kinase ( NTRK ) gene fusion without a known acquired resistance mutation,
• are metastatic or where surgical resection is likely to result in severe morbidity, and
• have no satisfactory alternative treatments or that have progressed following treatment. This indication is approved under accelerated approval based on overall response rate and duration of response [see Clinical Studies ( 14 )] . Continued approval for this indication may be contingent upon verification and description of clinical benefit in confirmatory trials. VITRAKVI is a kinase inhibitor indicated for the treatment of adult and pediatric patients with solid tumors that:
• have a neurotrophic receptor tyrosine kinase ( NTRK ) gene fusion without a known acquired resistance mutation,
• are metastatic or where surgical resection is likely to result in severe morbidity, and
• have no satisfactory alternative treatments or that have progressed following treatment. This indication is approved under accelerated approval based on overall response rate and duration of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in confirmatory trials ( 1 , 14 ).

AND ADMINISTRATION Select patients for treatment with VITRAKVI based on the presence of a NTRK gene fusion ( 2.1 , 14 ).

Recommended

Dosage in Adult and Pediatric Patients with Body Surface Area of 1 Meter-Squared or greater: 100 mg orally twice daily ( 2.2 )

Recommended

Dosage in Pediatric Patients with Body Surface Area of Less Than 1 Meter-Squared: 100 mg/m 2 orally twice daily ( 2.2 )

2.1 Patient Selection Select patients for treatment with VITRAKVI based on the presence of a NTRK gene fusion in tumor specimens <span class="opacity-50 text-xs">[see Clinical Studies (14) ]</span> . In patients with secretory breast cancer, mammary analogue secretory cancer (MASC), congenital mesoblastic nephroma (CMN), or infantile fibrosarcoma, consider treatment without confirmation of NTRK rearrangements in tumor specimens. Information on FDA-approved tests is available at http://www.fda.gov/companiondiagnostics.

2.2 Recommended Dosage Recommended Dosage in Adult and Pediatric Patients with Body Surface Area of 1 Meter-Squared or greater The recommended dosage of VITRAKVI is 100 mg orally twice daily, with or without food, until disease progression or until unacceptable toxicity.

Recommended

Dosage in Pediatric Patients with Body Surface Area Less Than 1 Meter-Squared The recommended dosage of VITRAKVI is 100 mg/m 2 orally twice daily, with or without food, until disease progression or until unacceptable toxicity.

2.3 Dosage Modifications for Adverse Reactions For Grade 2 and higher liver function test abnormalities, refer to Section 2.4, Table 2, Dosage Modifications for Hepatotoxicity. For all other Grade 3 or 4 adverse reactions: Withhold VITRAKVI until adverse reaction resolves or improves to baseline or Grade 1. Resume at the next dosage modification if resolution occurs within 4 weeks. Permanently discontinue VITRAKVI if an adverse reaction does not resolve within 4 weeks. The recommended dosage reductions for VITRAKVI for adverse reactions are provided in Table 1.

Table

1 Recommended Dosage Reductions for VITRAKVI for Adverse Reactions Dosage Reduction Adult and Pediatric Patients with Body Surface Area of 1 m 2 or Greater Pediatric Patients with Body Surface Area Less Than 1 m 2 First 75 mg orally twice daily 75 mg/m 2 orally twice daily Second 50 mg orally twice daily 50 mg/m 2 orally twice daily Third 100 mg orally once daily 25 mg/m 2 orally twice daily Pediatric patients on 25 mg/m 2 orally twice daily should remain on this dosage even if body surface area becomes greater than 1 m 2 during the treatment. Maximum dose should be 25 mg/m 2 orally twice daily at the third dosage modification. Permanently discontinue VITRAKVI in patients who are unable to tolerate VITRAKVI after three dose modifications.

2.4 Dosage Modifications for Hepatotoxicity The recommended dosage modifications for VITRAKVI liver function test abnormalities are provided in Table 2. For CTCAE Grade 2 ALT and/or AST elevation, monitor liver function frequently as clinically indicated, to establish whether a dose interruption or reduction is required <span class="opacity-50 text-xs">[see Warnings and Precautions (5.3) ]</span> .

Table

2 Recommended Dosage Modifications for VITRAKVI for Hepatotoxicity Severity Grading defined by National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) version

4.03 Dosage Modification ALT = alanine aminotransferase; AST = aspartate aminotransferase; ULN = upper limit of normal AST or ALT ≥ 5 × ULN with bilirubin ≤ 2 × ULN <span class="opacity-50 text-xs">[see Warnings and Precautions (5.3) ]</span> Withhold VITRAKVI until recovery to ≤ Grade 1 or return to baseline. Resume VITRAKVI at the next lower dose level. Permanently discontinue if a Grade 4 AST and/or ALT elevation occurs after resuming VITRAKVI. AST or ALT &gt; 3 × ULN with total bilirubin &gt; 2 × ULN in the absence of alternative causes Permanently discontinue VITRAKVI.

2.5 Dosage Modifications for Coadministration with Strong CYP3A4 Inhibitors Avoid coadministration of strong CYP3A4 inhibitors with VITRAKVI. If coadministration of a strong CYP3A4 inhibitor cannot be avoided, reduce the VITRAKVI dose by 50%. After the inhibitor has been discontinued for 3 to 5 elimination half-lives, resume the VITRAKVI dose that was used prior to initiating the CYP3A4 inhibitor <span class="opacity-50 text-xs">[see Drug Interactions (7.1) , Clinical Pharmacology (12.3) ]</span>.

2.6 Dosage Modifications for Coadministration with Strong or Moderate CYP3A4 Inducers Avoid coadministration of strong CYP3A4 inducers with VITRAKVI. If coadministration of a strong CYP3A4 inducer cannot be avoided, double the VITRAKVI dose. Additionally, for coadministration with a moderate CYP3A4 inducer, double the VITRAKVI dose. After the inducer has been discontinued for 3 to 5 elimination half-lives, resume the VITRAKVI dose that was used prior to initiating the CYP3A4 inducer <span class="opacity-50 text-xs">[see Drug Interactions (7.1) , Clinical Pharmacology (12.3) ]</span>.

2.7 Dosage Modifications for Patients with Hepatic Impairment Reduce the starting dose of VITRAKVI by 50% in patients with moderate (Child-Pugh B) to severe (Child-Pugh C) hepatic impairment <span class="opacity-50 text-xs">[see Use in Specific Populations (8.6) , Clinical Pharmacology (12.3) ]</span> .

2.8 Administration VITRAKVI capsule or oral solution may be used interchangeably. Do not make up a missed dose within 6 hours of the next scheduled dose. If vomiting occurs after taking a dose of VITRAKVI, take the next dose at the scheduled time.

Capsules

Swallow capsules whole with water. Do not chew or crush the capsules.

Oral

Solution packaged in one bottle containing 100 mL Store the glass bottle of VITRAKVI oral solution in the refrigerator. Discard any unused VITRAKVI oral solution remaining after 90 days of first opening the bottle. Prior to preparing an oral dose for administration, refer to the Instructions for Use.

Oral

Solution packaged in two bottles each containing 50 mL Store the glass bottles of VITRAKVI oral solution in the refrigerator. Discard any unused VITRAKVI oral solution remaining after 31 days of first opening the bottle. Prior to preparing an oral dose for administration, refer to the Instructions for Use.

None. None. ( 4 )

REACTIONS The following clinically significant adverse reactions are described elsewhere in the labeling: Central Nervous System Effects [see Warnings and Precautions (5.1) ]

Skeletal

Fractures [see Warnings and Precautions (5.2) ] Hepatotoxicity [see Warnings and Precautions (5.3) ] The most common (≥ 20%) adverse reactions, including laboratory abnormalities, with VITRAKVI were increased AST, increased ALT, anemia, hypoalbuminemia, musculoskeletal pain, increased alkaline phosphatase, leukopenia, lymphopenia, neutropenia, hypocalcemia, fatigue, vomiting, cough, constipation, pyrexia, diarrhea, nausea, abdominal pain, dizziness, and rash ( 6 ). To report SUSPECTED ADVERSE REACTIONS, contact Bayer HealthCare Pharmaceuticals Inc. at 1-888-842-2937 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch .

6.1 Clinical Trial 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. Unless noted, data in WARNINGS AND PRECAUTIONS and below reflects exposure to VITRAKVI in 444 patients, including 62% patients exposed for greater than 6 months, 44% patients exposed for greater than 1 year, and 30% patients exposed for greater than 2 years. VITRAKVI was studied in one adult dose-finding trial [LOXO-TRK-14001 (n = 75)], one pediatric dose-finding trial [SCOUT (n = 154)], and one single arm trial [NAVIGATE (n = 215)]. All patients had an unresectable or metastatic solid tumor and no satisfactory alternative treatment options or disease progression following treatment. Across these 444 patients, the median age was 44 years (range: 18 days to 90 years); 35% were younger than 18 years; 53% were female; 59% were White, 24% were Asian and, 4% were Black; and 7% were Hispanic/Latino. Most adults (91%) received VITRAKVI 100 mg orally twice daily and 91% of pediatrics (&lt; 18 years) received VITRAKVI 100 mg/m 2 twice daily up to a maximum dose of 100 mg twice daily. The dose ranged from 50 mg daily to 200 mg twice daily in adults and 9.6 mg/m 2 twice daily to 120 mg/m 2 twice daily in pediatrics <span class="opacity-50 text-xs">[see Use in Specific Populations (8.4) ]</span> . The most common serious adverse reactions (≥ 2%) were pneumonia, pyrexia, and dyspnea.

Grade

3 or 4 adverse reactions occurred in 60% of patients; adverse reactions leading to dose interruption or modification occurred in 45% and 11% of patients, respectively, and 12% permanently discontinued VITRAKVI for adverse reactions. The most common adverse reactions (1% each) that resulted in permanent discontinuation of VITRAKVI were increased ALT and increased AST. The most common adverse reactions (≥ 3%) resulting in dose interruption were increased ALT (6%), increased AST (5%), neutrophil count decreased (4.7%), pyrexia (4.3%), and vomiting (3.2%). Most (64%) adverse reactions leading to dose interruption occurred during the first three months of exposure. The most common adverse reactions (≥ 20%), including laboratory abnormalities, in order of decreasing frequency were increased AST, increased ALT, anemia, hypoalbuminemia, musculoskeletal pain, increased alkaline phosphatase, leukopenia, lymphopenia, neutropenia, hypocalcemia, fatigue, vomiting, cough, constipation, pyrexia, diarrhea, nausea, abdominal pain, dizziness, and rash. Adverse reactions of VITRAKVI occurring in ≥ 10% of patients and laboratory abnormalities worsening from baseline in ≥ 20% of patients are summarized in Table 3 and Table 4, respectively.

Table

3 Adverse Reactions Occurring in ≥ 10% of Patients Treated with VITRAKVI Adverse Reaction The adverse reaction identifies a composite term: VITRAKVI N = 444 All Grades National Cancer Institute-Common Terminology Criteria for Adverse Events (NCI-CTCAE) v 4.03. (%)

Grade

3-4 Grade 4 adverse reaction: 1 of cognitive impairment, 1 of pyrexia. (%) Musculoskeletal and Connective Tissue Musculoskeletal Pain Includes: arthralgia, back pain, bone pain, flank pain, groin pain, growing pains, musculoskeletal chest pain, musculoskeletal discomfort, musculoskeletal pain, musculoskeletal stiffness, myalgia, neck pain, non-cardiac chest pain, pain in extremity, pain in jaw, and tendon pain 41

3.6 General Fatigue Includes: fatigue, asthenia 31

2.5 Pyrexia 26

2.3 Edema Includes: face edema, generalized edema, lip edema, localized edema, edema, edema genital, edema peripheral, periorbital edema, and swelling 17

0.7 Respiratory, Thoracic and Mediastinal Cough Includes: cough, productive cough, and upper-airway cough syndrome 29

0.5 Dyspnea Includes: dyspnea, and dyspnea exertional 17

2.7 Nasal congestion 10 0 Nervous System Dizziness Includes: dizziness, dizziness postural, and vertigo 22

0.9 Headache 17

0.9 Cognitive Impairment Includes: amnesia, aphasia, cognitive disorder, confusional state, delirium, disturbance in attention, hallucination, hallucination visual, memory impairment, mental impairment, mental status changes 11 2 Gastrointestinal Vomiting 30

1.1 Constipation 27

0.5 Diarrhea 26

2.9 Nausea 25

0.5 Abdominal pain Includes: abdominal discomfort, abdominal pain, abdominal pain lower, abdominal pain upper, abdominal tenderness, epigastric discomfort, and gastrointestinal pain 24

1.4 Skin and Subcutaneous Tissue Disorders Rash Includes: dermatitis, dermatitis acneiform, dermatitis bullous, dermatitis exfoliative generalized, eczema, eczema asteatotic, palmar-plantar erythrodysaesthesia syndrome, rash, rash erythematous, rash macular, rash maculo-papular, rash papular, rash pruritic, and rash pustular 21

0.2 Psychiatric Mood disorders Includes: agitation, anxiety, depression, depressed mood, euphoric mood, fear, feeling jittery, irritability, panic attack, psychomotor hyperactivity, restlessness 14

0.9 Sleep Disturbance Includes: insomnia, sleep disorder, somnolence 12

0.2 Investigations Increased weight 17

4.1 Metabolism and Nutrition Decreased appetite 14

1.1 Infections and Infestations Upper respiratory tract infection 18

0.7 Urinary tract infection Includes: cystitis, cystitis escherichia, escherichia urinary tract infection, kidney infection, pyelonephritis, pyelonephritis acute, pyelonephritis chronic, and urinary tract infection 14

1.8 Nasopharyngitis 11 0 Clinically relevant adverse reactions occurring in ≤ 10% of patients include fractures (7%).

Table

4 Laboratory Abnormalities Occurring in ≥ 20% Patients Treated with VITRAKVI Laboratory Abnormality VITRAKVI Based on NCI CTCAE v4.03 All Grades (%) Denominator for each laboratory parameter is based on the number of patients with a baseline and post-treatment laboratory value available which ranged from 416 to 442 patients.

Grade

3-4 (%)

Chemistry

Increased AST 62 7 Increased ALT 61 8 Hypoalbuminemia 44

2.7 Increased alkaline phosphatase 40 3 Hypocalcemia 32

3.1 Hematology Anemia 45 8 Leukopenia 37

3.8 Lymphopenia 35 11 Neutropenia 34 11

AND PRECAUTIONS Central Nervous System (CNS) Effects: Advise patients and caretakers of the risk of CNS adverse reactions including dizziness, cognitive impairment, mood disorders, and sleep disturbances. Advise patients not to drive or operate hazardous machinery if experiencing neurotoxicity. Withhold and modify dosage, or permanently discontinue VITRAKVI based on severity. ( 2.3 , 5.1 )

Skeletal

Fractures: Promptly evaluate patients with signs or symptoms of fractures. ( 5.2 ) Hepatotoxicity: Obtain liver function tests (ALT, AST, ALP and bilirubin) before initiation of VITRAKVI and every 2 weeks during the first 2 months of treatment, then monthly thereafter or as clinically indicated. Temporarily withhold, reduce dose, or permanently discontinue VITRAKVI based on severity. ( 2.4 , 5.3 ) Embryo-Fetal Toxicity: Can cause fetal harm. Advise females with reproductive potential of potential risk to the fetus and to use effective contraception. ( 5.4 , 8.3 )

5.1 Central Nervous System Effects Central nervous system (CNS) adverse reactions occurred in patients receiving VITRAKVI, including dizziness, cognitive impairment, mood disorders, and sleep disturbances. In patients who received VITRAKVI (n=444), all grades CNS effects including cognitive impairment, mood disorders, dizziness and sleep disorders were observed in 40.3% with Grades 3-4 in 3.8% of patients. Cognitive impairment occurred in 11% of patients. The median time to onset of cognitive impairment was 6 months (range: 2 days to 56 months). Cognitive impairment occurring in ≥ 1% of patients included memory impairment (4.1%), disturbance in attention (3.6%), confusional state (2.3%), cognitive disorder (1.6%), delirium (1.4%), and hallucination (1.1%).

Grade

3 cognitive adverse reactions occurred in 1.8% of patients and Grade 4 cognitive adverse reactions in 0.2% of patients. Among the 49 patients with cognitive impairment, 6% required a dose modification, and 18% required dose interruption. Mood disorders occurred in 14% of patients. The median time to onset of mood disorders was 3.3 months (range: 1 day to 65 months). Mood disorders occurring in ≥ 1% of patients included anxiety (5%), agitation (3.2%), depression (3.2%), irritability (2.3%), and restlessness (1.1%).

Grade

3 mood disorders occurred in 0.9% of patients. Among the 63 patients who experienced mood disorders, no patient required a dose modification, and 1.6% required dose interruption. Dizziness occurred in 22% of patients, and Grade 3 dizziness occurred in 0.9% of patients. Among the 96 patients who experienced dizziness, 6% of patients required a dose modification, and 5% required dose interruption. Sleep disturbances occurred in 12% of patients. Sleep disturbances included insomnia (9%), somnolence (3.4%), and sleep disorder (0.5%).

Grade

3 sleep disturbances occurred in 0.2% of patients. Among the 54 patients who experienced sleep disturbances, no patient required a dose modification, and 3.7% required dose interruption. Advise patients and caretakers of these risks with VITRAKVI. Advise patients not to drive or operate hazardous machinery if they are experiencing neurologic adverse reactions. Withhold or permanently discontinue VITRAKVI based on the severity. If withheld, modify the VITRAKVI dosage when resumed [see Dosage and Administration (2.3) ] .

5.2 Skeletal Fractures Skeletal fractures can occur in patients taking VITRAKVI.

Among

444 patients who received VITRAKVI across clinical trials, fractures occurred in 7% of patients; 6% of 290 adult patients and 10% of 154 pediatric patients. Median time to first fracture was 13 months (range 27 days to 73 months) in patients followed per fracture. The most common fractures were of the rib (1.4%), fibula, foot, or wrist (0.7% each). Most fractures were associated with minimal or moderate trauma. Some fractures were associated with radiologic abnormalities suggestive of local tumor involvement. VITRAKVI treatment was interrupted due to fracture in 1.4% patients. Promptly evaluate patients with signs or symptoms of potential fracture (e.g., pain, changes in mobility, deformity). There are no data on the effects of VITRAKVI on healing of known fractures or risk of future fractures.

5.3 Hepatotoxicity Hepatotoxicity including drug-induced liver injury (DILI) has occurred in patients taking VITRAKVI. In patients who received VITRAKVI (n=444), increased AST of any grade occurred in 62% of patients and increased ALT of any grade occurred in 61%.

Grade

3-4 increased AST or ALT occurred in 7% and 8% of patients, respectively [see Adverse Reactions (6.1) ] . The median time to onset of increased AST was 1.9 months (range: 4 days to 3.8 years). The median time to onset of increased ALT was 1.9 months (range: 1 day to 4.9 years). Increased AST and ALT leading to dose modifications occurred in 1.6% and 3.2% of patients, respectively. Increased AST or ALT led to permanent discontinuation in 4 (0.9%) patients. There have been reports from clinical studies and postmarketing cases of Grade ≥ 2 increases in ALT and/or AST with increases in bilirubin ≥ 2 × ULN. Obtain liver function tests (ALT, AST, ALP and bilirubin) before initiation of VITRAKVI and monitor every 2 weeks during the first 2 months of treatment, then monthly thereafter, or more frequently following the occurrence of Grade 2 or greater AST or ALT elevation. Temporarily withhold, reduce the dose, or permanently discontinue VITRAKVI based on severity [see Dosage and Administration (2.4) ] .

5.4 Embryo-Fetal Toxicity Based on literature reports in human subjects with congenital mutations leading to changes in TRK signaling, findings from animal studies, and its mechanism of action, VITRAKVI can cause fetal harm when administered to a pregnant woman. Larotrectinib resulted in malformations in rats and rabbits at maternal exposures that were approximately 11- and 0.7-times, respectively, those observed at the clinical dose of 100 mg twice daily. Advise women of the potential risk to a fetus. Advise females of reproductive potential to use an effective method of contraception during treatment and for 1 week after the last dose of VITRAKVI <span class="opacity-50 text-xs">[see Use in Specific Populations (8.1 , 8.3) ]</span> .

INTERACTIONS Strong CYP3A4 Inhibitors: Avoid coadministration of strong CYP3A4 inhibitors with VITRAKVI. If coadministration cannot be avoided, reduce the VITRAKVI dose. ( 2.5 , 7.1 ) Moderate CYP3A4 Inhibitors: Monitor for adverse reactions more frequently in patients coadministered a moderate CYP3A4 inhibitor with VITRAKVI and reduce the VITRAKVI dosage based on severity of adverse reactions. ( 7.1 ) Strong CYP3A4 Inducers: Avoid coadministration of strong CYP3A4 inducers with VITRAKVI. If coadministration cannot be avoided, increase the VITRAKVI dose. ( 2.6 , 7.1 ) Moderate CYP3A4 Inducers: Increase the VITRAKVI dose. ( 2.6 , 7.1 ) Sensitive CYP3A4 Substrates: Avoid coadministration of sensitive CYP3A4 substrates with VITRAKVI. ( 7.2 )

7.1 Effects of Other Drugs on VITRAKVI Strong and Moderate CYP3A4 Inhibitors Coadministration of VITRAKVI with a strong or moderate CYP3A4 inhibitor may increase larotrectinib plasma concentrations, which may result in a higher incidence of adverse reactions <span class="opacity-50 text-xs">[see Clinical Pharmacology (12.3) ]</span>. Avoid coadministration of VITRAKVI with strong CYP3A4 inhibitors, including grapefruit or grapefruit juice. If coadministration of strong CYP3A4 inhibitors cannot be avoided, modify VITRAKVI dose as recommended <span class="opacity-50 text-xs">[see Dosage and Administration (2.5) ]</span> . In patients coadministered a moderate CYP3A4 inhibitor with VITRAKVI, monitor for adverse reactions more frequently and reduce the VITRAKVI dosage based on the severity of emergent adverse reactions <span class="opacity-50 text-xs">[see Dosage and Administration (2.3) ]</span> . Strong and Moderate CYP3A4 Inducers Coadministration of VITRAKVI with a strong or moderate CYP3A4 inducer may decrease larotrectinib plasma concentrations, which may decrease the efficacy of VITRAKVI <span class="opacity-50 text-xs">[see Clinical Pharmacology (12.3) ]</span>. Avoid coadministration of VITRAKVI with strong CYP3A4 inducers, including St. John&apos;s wort. If coadministration of strong CYP3A4 inducers cannot be avoided, modify VITRAKVI dose as recommended. For coadministration with moderate CYP3A4 inducers, modify VITRAKVI dose as recommended <span class="opacity-50 text-xs">[see Dosage and Administration (2.6) ]</span>.

7.2 Effects of VITRAKVI on Other Drugs Sensitive CYP3A4 Substrates Coadministration of VITRAKVI with sensitive CYP3A4 substrates may increase their plasma concentrations, which may increase the incidence or severity of adverse reactions <span class="opacity-50 text-xs">[see Clinical Pharmacology (12.3) ]</span> . Avoid coadministration of VITRAKVI with sensitive CYP3A4 substrates. If coadministration of these sensitive CYP3A4 substrates cannot be avoided, monitor patients for increased adverse reactions of these drugs.