Amlodipine Besylate And Atorvastatin Calcium

1 INDICATIONS AND USAGE CADUET (amlodipine and atorvastatin) is indicated in patients for whom treatment with both amlodipine and atorvastatin is appropriate. CADUET is a combination of amlodipine besylate, a calcium channel blocker, and atorvastatin calcium, a HMG-CoA-reductase inhibitor (statin), indicated in patients for whom treatment with both amlodipine and atorvastatin is appropriate ( 1 ). Amlodipine is indicated for the treatment of hypertension, to lower blood pressure. Lowering blood pressure reduces the risk of fatal and non-fatal cardiovascular events, primarily strokes and myocardial infarctions. Amlodipine is indicated for the treatment of Coronary Artery Disease ( 1 ). Atorvastatin is indicated ( 1 ): • To reduce the risk of: o Myocardial infarction (MI), stroke, revascularization procedures, and angina in adults with multiple risk factors for coronary heart disease (CHD) but without clinically evident CHD. o MI and stroke in adults with type 2 diabetes mellitus with multiple risk factors for CHD but without clinically evident CHD. o Non-fatal MI, fatal and non-fatal stroke, revascularization procedures, hospitalization for congestive heart failure, and angina in adults with clinically evident CHD. • As an adjunct to diet to reduce low-density lipoprotein (LDL-C) in: o Adults with primary hyperlipidemia. o Adults and pediatric patients aged 10 years and older with heterozygous familial hypercholesterolemia (HeFH). • As an adjunct to other LDL-C-lowering therapies to reduce LDL-C in adults and pediatric patients aged 10 years and older with homozygous familial hypercholesterolemia. • As an adjunct to diet for the treatment of adults with: o Primary dysbetalipoproteinemia. o Hypertriglyceridemia. Amlodipine Hypertension Amlodipine is indicated for the treatment of hypertension, to lower blood pressure. Lowering blood pressure reduces the risk of fatal and non-fatal cardiovascular events, primarily strokes and myocardial infarctions. These benefits have been seen in controlled trials of antihypertensive drugs from a wide variety of pharmacologic classes including amlodipine. Control of high blood pressure should be part of comprehensive cardiovascular risk management, including, as appropriate, lipid control, diabetes management, antithrombotic therapy, smoking cessation, exercise, and limited sodium intake. Many patients will require more than one drug to achieve blood pressure goals. For specific advice on goals and management, see published guidelines, such as those of the National High Blood Pressure Education Program’s Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure (JNC). Numerous antihypertensive drugs, from a variety of pharmacologic classes and with different mechanisms of action, have been shown in randomized controlled trials to reduce cardiovascular morbidity and mortality, and it can be concluded that it is blood pressure reduction, and not some other pharmacologic property of the drugs, that is largely responsible for those benefits. The largest and most consistent cardiovascular outcome benefit has been a reduction in the risk of stroke, but reductions in myocardial infarction and cardiovascular mortality also have been seen regularly. Elevated systolic or diastolic pressure causes increased cardiovascular risk, and the absolute risk increase per mmHg is greater at higher blood pressures, so that even modest reductions of severe hypertension can provide substantial benefit. Relative risk reduction from blood pressure reduction is similar across populations with varying absolute risk, so the absolute benefit is greater in patients who are at higher risk independent of their hypertension (for example, patients with diabetes or hyperlipidemia), and such patients would be expected to benefit from more aggressive treatment to a lower blood pressure goal. Some antihypertensive drugs have smaller blood pressure effects (as monotherapy) in black patients, and many antihypertensive drugs have additional approved indications and effects (e.g., on angina, heart failure, or diabetic kidney disease). These considerations may guide selection of therapy. Amlodipine may be used alone or in combination with other antihypertensive agents. Coronary Artery Disease (CAD) Chronic Stable Angina Amlodipine is indicated for the symptomatic treatment of chronic stable angina. Amlodipine may be used alone or in combination with other antianginal agents. Vasospastic Angina (Prinzmetal’s or Variant Angina) Amlodipine is indicated for the treatment of confirmed or suspected vasospastic angina. Amlodipine may be used as monotherapy or in combination with other antianginal agents. Angiographically Documented CAD In patients with recently documented CAD by angiography and without heart failure or an ejection fraction < 40%, amlodipine is indicated to reduce the risk of hospitalization for angina and to reduce the risk of a coronary revascularization procedure. Atorvastatin Atorvastatin is indicated: • To reduce the risk of: o Myocardial infarction (MI), stroke, revascularization procedures, and angina in adults with multiple risk factors for coronary heart disease (CHD) but without clinically evident CHD o MI and stroke in adults with type 2 diabetes mellitus with multiple risk factors for CHD but without clinically evident CHD o Non-fatal MI, fatal and non-fatal stroke, revascularization procedures, hospitalization for congestive heart failure, and angina in adults with clinically evident CHD • As an adjunct to diet to reduce low-density lipoprotein cholesterol (LDL-C) in: o Adults with primary hyperlipidemia. o Adults and pediatric patients aged 10 years and older with heterozygous familial hypercholesterolemia (HeFH). • As an adjunct to other LDL-C-lowering therapies, or alone if such treatments are unavailable, to reduce LDL C in adults and pediatric patients aged 10 years and older with homozygous familial hypercholesterolemia (HoFH). • As an adjunct to diet for the treatment of adults with: o Primary dysbetalipoproteinemia o Hypertriglyceridemia

2 DOSAGE AND ADMINISTRATION Usual starting dose (mg daily) Maximum dose (mg daily) Amlodipine 5 Start small adults or children, fragile, or elderly patients, or patients with hepatic insufficiency on 2.5 mg once daily ( 2 ). 10 Atorvastatin 10–20 Start patients requiring large LDL-C reduction (> 45%) at 40 mg once daily ( 2 ). 80 CADUET Dosage of CADUET must be individualized on the basis of both effectiveness and tolerance for each individual component in the treatment of hypertension/angina and hyperlipidemia. Select doses of amlodipine and atorvastatin independently. CADUET may be substituted for its individually titrated components. Patients may be given the equivalent dose of CADUET or a dose of CADUET with increased amounts of amlodipine, atorvastatin, or both for additional antianginal effects, blood pressure lowering, or lipid-lowering effect. CADUET may be used to provide additional therapy for patients already on one of its components. CADUET may be used to initiate treatment in patients with hyperlipidemia and either hypertension or angina. Important Dosage Information Take CADUET orally once daily at any time of the day, with or without food. Amlodipine The usual initial antihypertensive oral dosage of amlodipine is 5 mg once daily, and the maximum dose is 10 mg once daily. Pediatric (age > 6 years), small adult, fragile, or elderly patients, or patients with hepatic insufficiency may be started on 2.5 mg once daily and this dose may be used when adding amlodipine to other antihypertensive therapy. Adjust dosage according to blood pressure goals. In general, wait 7 to 14 days between titration steps. Titration may proceed more rapidly, however, if clinically warranted, provided the patient is assessed frequently. Angina The recommended dosage of amlodipine for chronic stable or vasospastic angina is 5–10 mg, with the lower dose suggested in the elderly and in patients with hepatic insufficiency. Most patients will require 10 mg for adequate effect. Coronary Artery Disease The recommended dosage range of amlodipine for patients with CAD is 5–10 mg once daily. In clinical studies, the majority of patients required 10 mg [see Clinical Studies (14.4) ] . Pediatrics The effective antihypertensive oral dose of amlodipine in pediatric patients ages 6–17 years is 2.5 mg to 5 mg once daily. Doses in excess of 5 mg daily have not been studied in pediatric patients [see Clinical Pharmacology (12.3) and Clinical Studies (14.1) ]. Atorvastatin Assess LDL-C when clinically appropriate, as early as 4 weeks after initiating atorvastatin, and adjust the ‎dosage if ‎‎necessary.‎ ‎ Recommended Dosage in Adult Patients The recommended starting dosage of atorvastatin is 10 mg to 20 mg once daily. The dosage range is 10 mg to 80 mg once daily. Patients who require reduction in LDL-C greater than 45% may be started at 40 mg once daily. Recommended Dosage in Pediatric Patients 10 Years of Age and Older with H e FH The recommended starting dosage of atorvastatin is 10 mg once daily. The dosage range is 10 mg to 20 mg once daily. Recommended Dosage in Pediatric Patients 10 Years of Age and Older with HoFH The recommended starting dosage of atorvastatin is 10 mg to 20 mg once daily. The dosage range is 10 mg to 80 mg once daily. Dosage Modifications Due to Drug Interactions Concomitant use of atorvastatin with the following drugs requires dosage modification of atorvastatin [see Warnings and Precautions (5.1) and Drug Interactions (7.1) ]. Anti-Viral Medications • In patients taking saquinavir plus ritonavir, darunavir plus ritonavir, fosamprenavir, fosamprenavir plus ritonavir, elbasvir plus grazoprevir or letermovir, do not exceed atorvastatin 20 mg once daily. • In patients taking nelfinavir, do not exceed atorvastatin 40 mg once daily. Select Azole Antifungals or Macrolide Antibiotics • In patients taking clarithromycin or itraconazole, do not exceed atorvastatin 20 mg once daily. For additional recommendations regarding concomitant use of atorvastatin with other anti-viral medications, azole antifungals or macrolide antibiotics, [see Drug Interactions (7.1) ].

6 ADVERSE REACTIONS The following important adverse reactions are described below and elsewhere in the labeling: • Myopathy and Rhabdomyolysis [see Warnings and Precautions (5.1) ] • Immune-Mediated Necrotizing Myopathy [see Warnings and Precautions (5.2) ] • Hepatic Dysfunction [see Warnings and Precautions (5.3) ] • Increases in HbA1c and Fasting Serum Glucose Levels [see Warnings and Precautions (5.6) ] Most common adverse reaction to amlodipine is edema which occurred in a dose related manner ( 6.1 ). Most common adverse reactions (incidence ≥ 5%) are nasopharyngitis, arthralgia, diarrhea, pain in extremity, and urinary tract infection to atorvastatin ( 6.1 ). To report SUSPECTED ADVERSE REACTIONS, contact Pfizer Inc. at 1-800-438-1985 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,the 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. CADUET CADUET (amlodipine/atorvastatin) has been evaluated for safety in 1092 patients in double-blind placebo-controlled studies treated for co-morbid hypertension and dyslipidemia. In general, treatment with CADUET was well tolerated. For the most part, adverse reactions have been mild or moderate in severity. In clinical trials with CADUET, no adverse reactions peculiar to this combination have been observed. Adverse reactions are similar in terms of nature, severity, and frequency to those reported previously with amlodipine and atorvastatin. The following information is based on the clinical experience with amlodipine and atorvastatin. Amlodipine Amlodipine has been evaluated for safety in more than 11,000 patients in U.S. and foreign clinical trials. In general, treatment with amlodipine was well tolerated at doses up to 10 mg daily. Most adverse reactions reported during therapy with amlodipine were of mild or moderate severity. In controlled clinical trials directly comparing amlodipine (N=1730) at doses up to 10 mg to placebo (N=1250), discontinuation of amlodipine because of adverse reactions was required in only about 1.5% of patients and was not significantly different from placebo (about 1%). The most commonly reported side effects more frequent than placebo are dizziness and edema. The incidence (%) of side effects that occurred in a dose related manner are as follows: Amlodipine 2.5 mg 5 mg 10 mg Placebo N=275 N=296 N=268 N=520 Edema 1.8 3.0 10.8 0.6 Dizziness 1.1 3.4 3.4 1.5 Flushing 0.7 1.4 2.6 0.0 Palpitations 0.7 1.4 4.5 0.6 Other adverse reactions that were not clearly dose related but were reported at an incidence greater than 1.0% in placebo-controlled clinical trials include the following: Amlodipine (%) Placebo (%) (N=1730) (N=1250) Fatigue 4.5 2.8 Nausea 2.9 1.9 Abdominal Pain 1.6 0.3 Somnolence 1.4 0.6 Edema, flushing, palpitations, and somnolence appear to be more common in women than in men. The following events occurred in < 1% but > 0.1% of patients treated with amlodipine in controlled clinical trials or under conditions of open trials or marketing experience where a causal relationship is uncertain; they are listed to alert the physician to a possible relationship: Cardiovascular: arrhythmia (including ventricular tachycardia and atrial fibrillation), bradycardia, chest pain, peripheral ischemia, syncope, tachycardia, vasculitis. Central and Peripheral Nervous System: hypoesthesia, neuropathy peripheral, paresthesia, tremor, vertigo. Gastrointestinal: anorexia, constipation, dysphagia, diarrhea, flatulence, pancreatitis, vomiting, gingival hyperplasia. General: allergic reaction, asthenia, 2 back pain, hot flushes, malaise, pain, rigors, weight gain, weight decrease. Musculoskeletal System: arthralgia, arthrosis, muscle cramps, 2 myalgia. Psychiatric: sexual dysfunction (male 2 and female), insomnia, nervousness, depression, abnormal dreams, anxiety, depersonalization. Respiratory System: dyspnea, 2 epistaxis. Skin and Appendages: angioedema, erythema multiforme, pruritus, 2 rash, 2 rash erythematous, rash maculopapular. Special Senses: abnormal vision, conjunctivitis, diplopia, eye pain, tinnitus. Urinary System: micturition frequency, micturition disorder, nocturia. Autonomic Nervous System: dry mouth, sweating increased. Metabolic and Nutritional: hyperglycemia, thirst. Hemopoietic: leukopenia, purpura, thrombocytopenia. 2 These events occurred in less than 1% in placebo controlled trials, but the incidence of these side effects was between 1% and 2% in all multiple dose studies. Amlodipine therapy has not been associated with clinically significant changes in routine laboratory tests. No clinically relevant changes were noted in serum potassium, serum glucose, total TG, TC, HDL-C, uric acid, blood urea nitrogen, or creatinine. Atorvastatin In the atorvastatin placebo-controlled clinical trial database of 16066 patients (8755 atorvastatin vs. 7311 placebo; age range 10‑93 years, 39% female, 91% White, 3% Black or African American, 2% Asian, 4% other) with a median treatment duration of 53 weeks, the most common adverse reactions in patients treated with atorvastatin that led to treatment discontinuation and occurred at a rate greater than placebo were: myalgia (0.7%), diarrhea (0.5%), nausea (0.4%), alanine aminotransferase increase (0.4%), and hepatic enzyme increase (0.4%). Table 2 summarizes adverse reactions, reported in ≥ 2% and at a rate greater than placebo in patients treated with atorvastatin (n=8755), from seventeen placebo-controlled trials. Table 2. Adverse Reactions Occurring in ≥ 2% in Patients Atorvastatin-Treated with any Dose and Greater than Placebo Adverse Reaction % Placebo N=7311 % 10 mg N=3908 % 20 mg N=188 % 40 mg N=604 % 80 mg N=4055 % Any dose N=8755 Nasopharyngitis 8.2 12.9 5.3 7.0 4.2 8.3 Arthralgia 6.5 8.9 11.7 10.6 4.3 6.9 Diarrhea 6.3 7.3 6.4 14.1 5.2 6.8 Pain in extremity 5.9 8.5 3.7 9.3 3.1 6.0 Urinary tract infection 5.6 6.9 6.4 8.0 4.1 5.7 Dyspepsia 4.3 5.9 3.2 6.0 3.3 4.7 Nausea 3.5 3.7 3.7 7.1 3.8 4.0 Musculoskeletal pain 3.6 5.2 3.2 5.1 2.3 3.8 Muscle spasms 3.0 4.6 4.8 5.1 2.4 3.6 Myalgia 3.1 3.6 5.9 8.4 2.7 3.5 Insomnia 2.9 2.8 1.1 5.3 2.8 3.0 Pharyngolaryngeal pain 2.1 3.9 1.6 2.8 0.7 2.3 Other adverse reactions reported in placebo-controlled trials include: Body as a Whole: malaise, pyrexia Digestive System: abdominal discomfort, eructation, flatulence, hepatitis, cholestasis Musculoskeletal System: musculoskeletal pain, muscle fatigue, neck pain, joint swelling Metabolic and Nutritional System: transaminases increase, liver function test abnormal, blood alkaline phosphatase increase, creatine phosphokinase increase, hyperglycemia Nervous System: nightmare Respiratory System: epistaxis Skin and Appendages: urticaria Special Senses: vision blurred, tinnitus Urogenital System: white blood cells urine positive. Elevations in Liver Enzyme Tests Persistent elevations in serum transaminases, defined as more than 3 times the ULN and occurring on 2 or more occasions, occurred in 0.7% of patients who received atorvastatin in clinical trials. The incidence of these abnormalities was 0.2%, 0.2%, 0.6%, and 2.3% for 10, 20, 40, and 80 mg, respectively. One patient in clinical trials developed jaundice. Increases in liver enzyme tests in other patients were not associated with jaundice or other clinical signs or symptoms. Upon dose reduction, drug interruption, or discontinuation, transaminase levels returned to or near pretreatment levels without sequelae. Eighteen of 30 patients with persistent liver enzyme elevations continued treatment with a reduced dose of atorvastatin. Treating to New Targets Study (TNT) In TNT, [see Clinical Studies (14.6) ] 10,001 patients (age range 29–78 years, 19% female; 94% White, 3% Black or African American, 1% Asian, 2% other) with clinically evident CHD were treated with atorvastatin 10 mg daily (n=5006) or atorvastatin 80 mg daily (n=4995). In the high-dose atorvastatin group, there were more patients with serious adverse reactions (1.8%) and discontinuations due to adverse reactions (9.9%) as compared to the low-dose group (1.4%; 8.1%, respectively) during a median follow-up of 4.9 years. Persistent transaminase elevations (≥ 3 x ULN twice within 4–10 days) occurred in 1.3% of individuals with atorvastatin 80 mg and in 0.2% of individuals with atorvastatin 10 mg. Elevations of CK (≥ 10 x ULN) were higher in the high-dose atorvastatin group (0.3%) compared to the low-dose atorvastatin group (0.1%). Stroke Prevention by Aggressive Reduction in Cholesterol Levels (SPARCL) In SPARCL, 4731 patients (age range 21–92 years, 40% female; 93% White, 3% Black or African American, 1% Asian, 3% other) without clinically evident CHD but with a stroke or transient ischemic attack (TIA) within the previous 6 months were treated with atorvastatin 80 mg (n=2365) or placebo (n=2366) for a median follow-up of 4.9 years. There was a higher incidence of persistent hepatic transaminase elevations (≥ 3 x ULN twice within 4–10 days) in the atorvastatin group (0.9%) compared to placebo (0.1%). Elevations of CK ( > 10 x ULN) were rare, but were higher in the atorvastatin group (0.1%) compared to placebo (0.0%). Diabetes was reported as an adverse reaction in 6.1% of subjects in the atorvastatin group and 3.8% of subjects in the placebo group. In a post-hoc analysis, atorvastatin 80 mg reduced the incidence of ischemic stroke (9.2% vs. 11.6%) and increased the incidence of hemorrhagic stroke (2.3% vs. 1.4%) compared to placebo. The incidence of fatal hemorrhagic stroke was similar between groups (17 atorvastatin vs. 18 placebo). The incidence of non-fatal hemorrhagic strokes was significantly greater in the atorvastatin group (38 non-fatal hemorrhagic strokes) as compared to the placebo group (16 non-fatal hemorrhagic strokes). Patients who entered the trial with a hemorrhagic stroke appeared to be at increased risk for hemorrhagic stroke (16% atorvastatin vs. 4% placebo). Adverse Reactions from Clinical Studies of Atorvastatin in Pediatric Patients with HeFH In a 26-week controlled study in pediatric patients with HeFH (ages 10 years to 17 years) (n=140, 31% female; 92% White, 1.6% Black or African American, 1.6% Asian, 4.8% other), the safety and tolerability profile of atorvastatin 10 to 20 mg daily, as an adjunct to diet to reduce total cholesterol, LDL-C, and apo B levels, was generally similar to that of placebo [see Use in Specific Populations (8.4) and Clinical Studies (14.11) ]. 6.2 Postmarketing Experience The following adverse reactions have been identified during post-approval use of amlodipine and atorvastatin. 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. Amlodipine The following postmarketing event has been reported infrequently where a causal relationship is uncertain: gynecomastia. In postmarketing experience, jaundice and hepatic enzyme elevations (mostly consistent with cholestasis or hepatitis), in some cases severe enough to require hospitalization, have been reported in association with use of amlodipine. Postmarketing reporting has also revealed a possible association between extrapyramidal disorder and amlodipine. Amlodipine has been used safely in patients with chronic obstructive pulmonary disease, well-compensated congestive heart failure, coronary artery disease, peripheral vascular disease, diabetes mellitus, and abnormal lipid profiles. Atorvastatin Gastrointestinal Disorders: pancreatitis General Disorders: fatigue Hepatobiliary Disorders: fatal and non-fatal hepatic failure Immune System Disorders: anaphylaxis Injury: tendon rupture Musculoskeletal and Connective Tissue Disorders: rhabdomyolysis, myositis. There have been rare reports of immune-mediated necrotizing myopathy associated with statin use. Nervous System Disorders: dizziness, peripheral neuropathy. There have been rare reports of cognitive impairment (e.g., memory loss, forgetfulness, amnesia, memory impairment, confusion) associated with the use of all statins. Cognitive impairment was generally nonserious, and reversible upon statin discontinuation, with variable times to symptom onset (1 day to years) and symptom resolution (median of 3 weeks). There have been rare reports of new-onset or exacerbation of myasthenia gravis, including ocular myasthenia, and reports of recurrence when the same or a different statin was administered. Psychiatric Disorders: depression Respiratory Disorders: interstitial lung disease Skin and Subcutaneous Tissue Disorders: angioneurotic edema, bullous rashes (including erythema multiforme, Stevens-Johnson syndrome, and toxic epidermal necrolysis)

12.3 Pharmacokinetics Absorption Amlodipine: After oral administration of therapeutic doses of amlodipine alone, absorption produces peak plasma concentrations between 6 and 12 hours. Absolute bioavailability has been estimated to be between 64% and 90%. Atorvastatin: After oral administration alone, atorvastatin is rapidly absorbed; maximum plasma concentrations occur within 1 to 2 hours. Extent of absorption increases in proportion to atorvastatin dose. The absolute bioavailability of atorvastatin (parent drug) is approximately 14% and the systemic availability of HMG-CoA reductase inhibitory activity is approximately 30%. The low systemic availability is attributed to presystemic clearance in gastrointestinal mucosa and/or hepatic first-pass metabolism.Although food decreases the rate and extent of drug absorption by approximately 25% and 9%, respectively, as assessed by C max and AUC,LDL-C reduction is similar whether atorvastatin is given with or without food Plasma atorvastatin concentrations are lower (approximately 30% for Cmax and AUC) following evening drug administration compared with morning. However, LDL-C reduction is the same regardless of the time of day of drug administration. CADUET: Following oral administration of CADUET, peak plasma concentrations of amlodipine and atorvastatin are seen at 6 to 12 hours and 1 to 2 hours post dosing, respectively. The rate and extent of absorption (bioavailability) of amlodipine and atorvastatin from CADUET are not significantly different from the bioavailability of amlodipine and atorvastatin administered separately (see above). The bioavailability of amlodipine from CADUET was not affected by food. Food decreases the rate and extent of absorption of atorvastatin from CADUET by approximately 32% and 11%, respectively, as it does with atorvastatin when given alone. LDL-C reduction is similar whether atorvastatin is given with or without food. Distribution Amlodipine: Ex vivo studies have shown that approximately 93% of the circulating amlodipine drug is bound to plasma proteins in hypertensive patients. Steady-state plasma levels of amlodipine are reached after 7 to 8 days of consecutive daily dosing. Atorvastatin: Mean volume of distribution of atorvastatin is approximately 381 liters. Atorvastatin is ≥98% bound to plasma proteins. A blood/plasma ratio of approximately 0.25 indicates poor drug penetration into red blood cells. Elimination Metabolism Amlodipine: Amlodipine is extensively (about 90%) converted to inactive metabolites via hepatic metabolism. Atorvastatin: Atorvastatin is extensively metabolized to ortho- and parahydroxylated derivatives and various beta-oxidation products. In vitro inhibition of HMG-CoA reductase by ortho- and parahydroxylated metabolites is equivalent to that of atorvastatin. Approximately 70% of circulating inhibitory activity for HMG-CoA reductase is attributed to active metabolites. In vitro studies suggest the importance of atorvastatin metabolism by cytochrome P4503A4, consistent with increased plasma concentrations of atorvastatin in humans following co-administration with erythromycin, a known inhibitor of this isozyme [see Drug Interactions (7) ] . In animals, the ortho-hydroxy metabolite undergoes further glucuronidation. Excretion Amlodipine: Elimination from the plasma is biphasic with a terminal elimination half-life of about 30–50 hours. Ten percent of the parent amlodipine compound and 60% of the metabolites of amlodipine are excreted in the urine. Atorvastatin: Atorvastatin and its metabolites are eliminated primarily in bile following hepatic and/or extra-hepatic metabolism; however, the drug does not appear to undergo enterohepatic recirculation. Mean plasma elimination half-life of atorvastatin in humans is approximately 14 hours, but the half-life of inhibitory activity for HMG-CoA reductase is 20 to 30 hours because of the contribution of active metabolites. Less than 2% of a dose of atorvastatin is recovered in urine following oral administration. Specific Populations Geriatric Amlodipine: Elderly patients have decreased clearance of amlodipine with a resulting increase in AUC of approximately 40–60%, and a lower initial dose of amlodipine may be required. Atorvastatin: Plasma concentrations of atorvastatin are higher (approximately 40% for C max and 30% for AUC) in healthy elderly subjects (age ≥ 65 years) than in young adults. Pediatric Amlodipine: Sixty-two hypertensive patients aged 6 to 17 years received doses of amlodipine between 1.25 mg and 20 mg. Weight-adjusted clearance and volume of distribution were similar to values in adults. Atorvastatin: Apparent oral clearance of atorvastatin in pediatric subjects appeared similar to that of adults when scaled allometrically by body weight as the body weight was the only significant covariate in atorvastatin population pharmacokinetics model with data including pediatric HeFH patients (ages 10 years to 17 years of age, n=29) in an open-label, 8-week study. Gender Atorvastatin: Plasma concentrations of atorvastatin in females differ from those in males (approximately 20% higher for C max and 10% lower for AUC); however, there is no clinically significant difference in LDL-C reduction with atorvastatin between males and females. Renal Impairment Amlodipine: The pharmacokinetics of amlodipine are not significantly influenced by renal impairment. Patients with renal failure may therefore receive the usual initial amlodipine dose. Atorvastatin: Renal disease has no influence on the plasma concentrations or LDL-C reduction of atorvastatin [see Use in Specific Populations (8.6) ] . While studies have not been conducted in patients with end-stage renal disease, hemodialysis is not expected to clear atorvastatin or amlodipine since both drugs are extensively bound to plasma proteins. Hepatic Impairment Amlodipine: Elderly patients and patients with hepatic insufficiency have decreased clearance of amlodipine with a resulting increase in AUC of approximately 40–60%. Atorvastatin: In patients with chronic alcoholic liver disease, plasma concentrations of atorvastatin are markedly increased. Cmax and AUC are each 4-fold greater in patients with Childs-Pugh A disease. Cmax and AUC of atorvastatin are approximately 16-fold and 11-fold increased, respectively, in patients with Childs-Pugh B disease [ see Use in Specific Populations (8.7) ]. Heart Failure Amlodipine: In patients with moderate to severe heart failure, the increase in AUC for amlodipine was similar to that seen in the elderly and in patients with hepatic insufficiency. Effects of Other Drugs on CADUET Amlodipine : Co-administered cimetidine, magnesium-and aluminum hydroxide antacids, sildenafil, and grapefruit juice have no impact on the exposure to amlodipine. CYP3A inhibitors : Co-administration of a 180 mg daily dose of diltiazem with 5 mg amlodipine in elderly hypertensive patients resulted in a 60% increase in amlodipine systemic exposure. Erythromycin co-administration in healthy volunteers did not significantly change amlodipine systemic exposure. However, strong inhibitors of CYP3A (e.g., itraconazole, clarithromycin) may increase the plasma concentrations of amlodipine to a greater extent [see Drug Interactions (7.1) ] . Atorvastatin : Atorvastatin is a substrate of the hepatic transporters, OATP1B1 and OATP1B3 transporter. Metabolites of atorvastatin are substrates of OATP1B1. Atorvastatin is also identified as a substrate of the efflux transporter BCRP, which may limit the intestinal absorption and biliary clearance of atorvastatin. Table 6 shows effects of other drugs on the pharmacokinetics of atorvastatin. Table 6. Effect of Co-administered Drugs on the Pharmacokinetics of Atorvastatin Co-administered drug and dosage regimen Atorvastatin Dosage (mg) Ratio of AUC Represents ratio of treatments (co-administered drug plus atorvastatin vs atorvastatin alone). Ratio of C max See Sections 5.1 and 7 for clinical significance. Cyclosporine 5.2 mg/kg/day, stable dose 10 mg QD Once daily for 28 days 8.69 10.66 Tipranavir 500 mg BID Twice daily /ritonavir 200 mg BID , 7 days 10 mg SD Single dosage 9.36 8.58 Glecaprevir 400 mg QD /pibrentasvir 120 mg QD , 7 days 10 mg QD for 7 days 8.28 22.00 Telaprevir 750 mg q8h Every 8 hours , 10 days 20 mg SD 7.88 10.60 , The dose of saquinavir plus ritonavir in this study is not the clinically used dose. The increase in atorvastatin exposure when used clinically is likely to be higher than what was observed in this study. Therefore, caution should be applied and the lowest dose necessary should be used. Saquinavir 400 mg BID /ritonavir 400 mg BID , 15 days 40 mg QD for 4 days 3.93 4.31 Elbasvir 50 mg QD /grazoprevir 200 mg QD , 13 days 10 mg SD 1.94 4.34 Simeprevir 150 mg QD , 10 days 40 mg SD 2.12 1.70 Clarithromycin 500 mg BID , 9 days 80 mg QD for 8 days 4.54 5.38 Darunavir 300 mg BID /ritonavir 100 mg BID , 9 days 10 mg QD for 4 days 3.45 2.25 Itraconazole 200 mg QD , 4 days 40 mg SD 3.32 1.20 Letermovir 480 mg QD , 10 days 20 mg SD 3.29 2.17 Fosamprenavir 700 mg BID /ritonavir 100 mg BID , 14 days 10 mg QD for 4 days 2.53 2.84 Fosamprenavir 1400 mg BID , 14 days 10 mg QD for 4 days 2.30 4.04 Nelfinavir 1250 mg BID , 14 days 10 mg QD for 28 days 1.74 2.22 Grapefruit Juice, 240 mL QD , Greater increases in AUC (ratio of AUC up to 2.5) and/or Cmax (ratio of Cmax up to 1.71) have been reported with excessive grapefruit consumption (≥ 750 mL – 1.2 liters per day). 40 mg SD 1.37 1.16 Diltiazem 240 mg QD , 28 days 40 mg SD 1.51 1.00 Erythromycin 500 mg QID Four times daily , 7 days 10 mg SD 1.33 1.38 Amlodipine 10 mg, single dose 80 mg SD 1.18 0.91 Cimetidine 300 mg QID , 2 weeks 10 mg QD for 2 weeks 1.00 0.89 Colestipol 10 g BID , 24 weeks 40 mg QD for 8 weeks NA 0.74 Ratio based on a single sample taken 8–16 h post dose. Maalox TC ® 30 mL QID , 17 days 10 mg QD for 15 days 0.66 0.67 Efavirenz 600 mg QD , 14 days 10 mg for 3 days 0.59 1.01 Rifampin 600 mg QD , 7 days (co-administered) Due to the dual interaction mechanism of rifampin, simultaneous co-administration of atorvastatin with rifampin is recommended, as delayed administration of atorvastatin after administration of rifampin has been associated with a significant reduction in atorvastatin plasma concentrations. 40 mg SD 1.12 2.90 Rifampin 600 mg QD , 5 days (doses separated) 40 mg SD 0.20 0.60 Gemfibrozil 600 mg BID , 7 days 40 mg SD 1.35 1.00 Fenofibrate 160 mg QD , 7 days 40 mg SD 1.03 1.02 Boceprevir 800 mg TID Three times daily , 7 days 40 mg SD 2.32 2.66 Effects of CADUET on Other Drugs Amlodipine : Amlodipine is a weak inhibitor of CYP3A and may increase exposure to CYP3A substrates. In vitro data indicate that amlodipine has no effect on the human plasma protein binding of digoxin, phenytoin, warfarin, and indomethacin. Co-administered amlodipine does not affect the exposure to atorvastatin, digoxin, ethanol and the warfarin prothrombin response time. Cyclosporine : A prospective study in renal transplant patients (N=11) showed on an average of 40% increase in trough cyclosporine levels when concomitantly treated with amlodipine [see Drug Interactions (7.2) ] . Tacrolimus : A prospective study in healthy Chinese volunteers (N=9) with CYP3A5 expressers showed a 2.5- to 4-fold increase in tacrolimus exposure when concomitantly administered with amlodipine compared to tacrolimus alone. This finding was not observed in CYP3A5 non-expressers (N=6). However, a 3-fold increase in plasma exposure to tacrolimus in a renal transplant patient (CYP3A5 non-expresser) upon initiation of amlodipine for the treatment of post-transplant hypertension resulting in reduction of tacrolimus dose has been reported. Irrespective of the CYP3A5 genotype status, the possibility of an interaction cannot be excluded with these drugs [see Drug Interactions (7.2) ] . Atorvastatin : Table 7 shows the effects of atorvastatin on the pharmacokinetics of other drugs. Table 7. Effect of Atorvastatin on the Pharmacokinetics of Co-administered Drugs Atorvastatin Co-administered drug and dosage regimen Drug/Dosage (mg) Ratio of AUC Ratio of C max 80 mg QD Once daily for 15 days Antipyrine, 600 mg SD Single dosage 1.03 0.89 80 mg QD for 10 days See Section 7 for clinical significance. Digoxin 0.25 mg QD , 20 days 1.15 1.20 40 mg QD for 22 days Oral contraceptive QD , 2 months – norethindrone 1 mg – ethinyl estradiol 35 µg 1.28 1.19 1.23 1.30 10 mg SD Tipranavir 500 mg BID Twice daily /ritonavir 200 mg BID , 7 days 1.08 0.96 10 mg QD for 4 days Fosamprenavir 1400 mg BID , 14 days 0.73 0.82 10 mg QD for 4 days Fosamprenavir 700 mg BID /ritonavir 100 mg BID , 14 days 0.99 0.94 Atorvastatin had no clinically significant effect on prothrombin time when administered to patients receiving chronic warfarin treatment.