Ivabradine

1 INDICATIONS AND USAGE Ivabradine is a hyperpolarization-activated cyclic nucleotide-gated channel blocker indicated: To reduce the risk of hospitalization for worsening heart failure in adult patients with stable, symptomatic chronic heart failure with reduced left ventricular ejection fraction. ( 1.1 ) 1.1 Heart Failure in Adult Patients Ivabradine tablets are indicated to reduce the risk of hospitalization for worsening heart failure in adult patients with stable, symptomatic chronic heart failure with left ventricular ejection fraction ≤ 35%, who are in sinus rhythm with resting heart rate ≥ 70 beats per minute and either are on maximally tolerated doses of beta-blockers or have a contraindication to beta-blocker use.

12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action Ivabradine tablets blocks the hyperpolarization-activated cyclic nucleotide-gated (HCN) channel responsible for the cardiac pacemaker I f current, which regulates heart rate. In clinical electrophysiology studies, the cardiac effects were most pronounced in the sinoatrial (SA) node, but prolongation of the AH interval has occurred as has PR interval prolongation. There was no effect on ventricular repolarization and no effects on myocardial contractility [see Clinical Pharmacology (12.2) ]. Ivabradine tablets can also inhibit the retinal current I h . I h is involved in curtailing retinal responses to bright light stimuli. Under triggering circumstances (e.g., rapid changes in luminosity), partial inhibition of I h by ivabradine tablets may underlie the luminous phenomena experienced by patients. Luminous phenomena (phosphenes) are described as a transient enhanced brightness in a limited area of the visual field [see Adverse Reactions (6.1) ]. 12.2 Pharmacodynamics Ivabradine tablets causes a dose-dependent reduction in heart rate. The size of the effect is dependent on the baseline heart rate (i.e., greater heart rate reduction occurs in subjects with higher baseline heart rate). At recommended doses, heart rate reduction is approximately 10 bpm at rest and during exercise. Analysis of heart rate reduction vs. dose indicates a plateau effect at doses > 20 mg twice daily. In a study of subjects with preexisting conduction system disease (first- or second-degree AV block or left or right bundle branch block) requiring electrophysiologic study, IV ivabradine (0.20 mg/kg) administration slowed the overall heart rate by approximately 15 bpm, increased the PR interval (29 msec), and increased the AH interval (27 msec). Ivabradine tablets does not have negative inotropic effects. Ivabradine increases the uncorrected QT interval with heart rate slowing but does not cause rate-corrected prolongation of QT. 12.3 Pharmacokinetics The peak concentration (C max ) and area under the plasma concentration time curve (AUC) are similar for ivabradine and S 18982 between oral solution and tablets for the same dose. Absorption and Bioavailability Following oral administration, peak plasma ivabradine concentrations are reached in approximately1 hour under fasting conditions. The absolute oral bioavailability of ivabradine is approximately 40% because of first-pass elimination in the gut and liver. Food delays absorption by approximately 1 hour and increases plasma exposure by 20% to 40%. Ivabradine tablets should be taken with food [see Dosage and Administration (2) ]. Ivabradine is approximately 70% plasma protein bound, and the volume of distribution at steady state is approximately 100 L. Metabolism and Excretion The pharmacokinetics of ivabradine are linear over an oral dose range of 0.5 mg to 24 mg. Ivabradine is extensively metabolized in the liver and intestines by CYP3A4-mediated oxidation. The major metabol

2 DOSAGE AND ADMINISTRATION Adult patients ● Starting dose is 2.5 (vulnerable adults) or 5 mg twice daily with food. After 2 weeks of treatment, adjust dose based on heart rate. The maximum dose is 7.5 mg twice daily. ( 2.1 ) 2.1 Adults The recommended starting dose of ivabradine tablets is 5 mg twice daily with food. Assess patient after two weeks and adjust dose to achieve a resting heart rate between 50 and 60 beats per minute (bpm) as shown in Table 1. Thereafter, adjust dose as needed based on resting heart rate and tolerability. The maximum dose is 7.5 mg twice daily. In adult patients unable to swallow tablets, Corlanor oral solution can be used [see Clinical Pharmacology (12.3) ] . In patients with a history of conduction defects or other patients in whom bradycardia could lead to hemodynamic compromise, initiate therapy at 2.5 mg twice daily before increasing the dose based on heart rate [see Warnings and Precautions (5.3) ] . Table 1. Dose Adjustment for Adults * [see Warnings and Precautions (5.3) ] Heart Rate Dose Adjustment > 60 bpm Increase dose by 2.5 mg (given twice daily) up to a maximum dose of 7.5 mg twice daily 50-60 bpm Maintain dose < 50 bpm or signs and symptoms of bradycardia Decrease dose by 2.5 mg (given twice daily); if current dose is 2.5 mg twice daily, discontinue therapy*

6 ADVERSE REACTIONS Clinically significant adverse reactions that appear in other sections of the labeling include: Atrial Fibrillation [see Warnings and Precautions (5.2) ] Bradycardia and Conduction Disturbances [see Warnings and Precautions (5.3) ] Most common adverse reactions occurring in ≥ 1% of patients are bradycardia, hypertension, atrial fibrillation and luminous phenomena (phosphenes). ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Ingenus Pharmaceuticals, LLC at 1-877-748-1970 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 practice. Adult Patients with Heart Failure In SHIFT, safety was evaluated in 3,260 patients treated with ivabradine tablets and 3,278 patients given placebo. The median duration of ivabradine tablets exposure was 21.5 months. The most common adverse drug reactions in the SHIFT trial are shown in Table 2 [see Warnings and Precautions (5.2) , ( 5.3 )]. Table 2. Adverse Drug Reactions with Rates ≥ 1.0% Higher on Ivabradine than Placebo occurring in > 1% on Ivabradine in SHIFT Ivabradine N = 3,260 Placebo N = 3,278 Bradycardia 10 % 2.2 % Hypertension, Blood Pressure Increased 8.9 % 7.8 % Atrial fibrillation 8.3 % 6.6 % Phosphenes, visual brightness 2.8 % 0.5 % Luminous Phenomena (Phosphenes) Phosphenes are phenomena described as a transiently enhanced brightness in a limited area of the visual field, halos, image decomposition (stroboscopic or kaleidoscopic effects), colored bright lights, or multiple images (retinal persistency). Phosphenes are usually triggered by sudden variations in light intensity. Ivabradine tablets can cause phosphenes, thought to be mediated through ivabradine tablets effects on retinal photoreceptors [see Clinical Pharmacology (12.1) ]. Onset is generally within the first 2 months of treatment, after which they may occur repeatedly. Phosphenes were generally reported to be of mild to moderate intensity and led to treatment discontinuation in < 1% of patients; most resolved during or after treatment. 6.2 Post marketing Experience Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to estimate their frequency reliably or establish a causal relationship to drug exposure. The following adverse reactions have been identified in adults during post-approval use of ivabradine tablets: syncope, hypotension, torsade de pointes, ventricular fibrillation, ventricular tachycardia, angioedema, erythema, rash, pruritus, urticaria, vertigo, and diplopia, and visual impairment.

5 WARNINGS AND PRECAUTIONS Fetal toxicity: Females should use effective contraception. ( 5.1 ) Monitor patients for atrial fibrillation. ( 5.2 ) Monitor heart rate decreases and bradycardia symptoms during treatment. ( 5.3 ) Not recommended in patients with 2 nd degree AV block. ( 5.3 ) 5.1 Fetal Toxicity Ivabradine tablets may cause fetal toxicity when administered to a pregnant woman based on findings in animal studies. Embryo-fetal toxicity and cardiac teratogenic effects were observed in fetuses of pregnant rats treated during organogenesis at exposures 1 to 3 times the human exposures (AUC 0 - 24hr ) at the maximum recommended human dose (MRHD) [see Use in Specific Populations (8.1) ]. Advise females of reproductive potential to use effective contraception when taking ivabradine tablets [see Use in Specific Populations (8.3) ] . 5.2 Atrial Fibrillation Ivabradine tablets increases the risk of atrial fibrillation. In the Systolic Heart Failure Treatment with the I f Inhibitor Ivabradine Trial (SHIFT), the rate of atrial fibrillation was 5.0% per patient-year in patients treated with ivabradine tablets and 3.9% per patient-year in patients treated with placebo [see Clinical Studies (14) ] . Regularly monitor cardiac rhythm. Discontinue ivabradine tablets if atrial fibrillation develops. 5.3 Bradycardia and Conduction Disturbances Adult Patients Bradycardia, sinus arrest, and heart block have occurred with ivabradine tablets. The rate of bradycardia was 6.0% per patient-year in patients treated with ivabradine tablets (2.7% symptomatic; 3.4% asymptomatic) and 1.3% per patient-year in patients treated with placebo. Risk factors for bradycardia include sinus node dysfunction, conduction defects (e.g., 1 st or 2 nd degree atrioventricular block, bundle branch block), ventricular dyssynchrony, and use of other negative chronotropes (e.g., digoxin, diltiazem, verapamil, amiodarone). Bradycardia may increase the risk of QT prolongation which may lead to severe ventricular arrhythmias, including torsade de pointes, especially in patients with risk factors such as use of QTc prolonging drugs [see Adverse Reactions (6.2) ] . Concurrent use of verapamil or diltiazem will increase ivabradine tablets exposure, may themselves contribute to heart rate lowering, and should be avoided [see Clinical Pharmacology (12.3) ] . Avoid use of ivabradine tablets in patients with 2 nd degree atrioventricular block unless a functioning demand pacemaker is present [see Contraindications (4) ].

4 CONTRAINDICATIONS Ivabradine tablets are contraindicated in patients with: Acute decompensated heart failure Clinically significant hypotension Sick sinus syndrome, sinoatrial block or 3 rd degree AV block, unless a functioning demand pacemaker is present Clinically significant bradycardia [see Warnings and Precautions (5.3) ] Severe hepatic impairment [see Use in Specific Populations (8.6) ] Pacemaker dependence (heart rate maintained exclusively by the pacemaker) [see Drug Interactions (7.3) ] Concomitant use of strong cytochrome P450 3A4 (CYP3A4) inhibitors [see Drug Interactions (7.1) ] Acute decompensated heart failure ( 4 ) Clinically significant hypotension ( 4 ) Sick sinus syndrome, sinoatrial block or 3 rd degree AV block, unless a functioning demand pacemaker is present ( 4 ) Clinically significant bradycardia ( 4 ) Severe hepatic impairment ( 4 ) Heart rate maintained exclusively by the pacemaker ( 4 ) In combination with strong cytochrome CYP3A4 inhibitors ( 4 )

10 OVERDOSAGE Overdose may lead to severe and prolonged bradycardia. In the event of bradycardia with poor hemodynamic tolerance, temporary cardiac pacing may be required. Supportive treatment, including intravenous (IV) fluids, atropine, and intravenous beta-stimulating agents such as isoproterenol, may be considered.