Dextroamphetamine Sulfate, Dextroamphetamine Saccharate, Amphetamine Sulfate And Amphetamine Aspartate

1 INDICATIONS AND USAGE ADDERALL XR, a CNS stimulant, is indicated for the treatment of attention deficit hyperactivity disorder (ADHD) in adults and pediatric patients 6 years and older. ( 1 ) Limitations of Use The use of ADDERALL XR is not recommended in pediatric patients younger than 6 years of age because they had higher plasma exposure and a higher incidence of adverse reactions (e.g., weight loss) than patients 6 years and older at the same dosage. ( 5.5 , 8.4 ) 1.1 Attention Deficit Hyperactivity Disorder ADDERALL XR ® is indicated for the treatment of attention deficit hyperactivity disorder (ADHD) in adults and pediatric patients 6 years and older. Limitations of Use The use of ADDERALL XR is not recommended in pediatric patients younger than 6 years of age because they had higher plasma exposure and a higher incidence of adverse reactions (e.g., weight loss) than patients 6 years and older at the same dosage [see Warnings and Precautions ( 5.5 ), Use in Specific Populations ( 8.4 )].

2 DOSAGE AND ADMINISTRATION Pediatric patients (ages 6 to 17): 10 mg once daily in the morning. Maximum dose for children 6 to 12 years of age is 30 mg once daily. ( 2.2 , 2.3 , 2.4 ) Adults: 20 mg once daily in the morning. ( 2.5 ) Pediatric patients (ages 6 to 17) with severe renal impairment: 5 mg once daily in the morning. Maximum dose for children 6 to 12 years of age with severe renal impairment is 20 mg once daily. ( 2.6 , 8.6 ) Adults with severe renal impairment: 15 mg once daily in the morning. ( 2.6 , 8.6 ) Patients with end stage renal disease (ESRD): Not recommended. ( 2.6 , 8.6 ) 2.1 Pretreatment Screening Prior to treating patients with ADDERALL XR, assess: for the presence of cardiac disease (i.e., perform a careful history, family history of sudden death or ventricular arrhythmia, and physical exam) [see Warnings and Precautions ( 5.2 )] . the family history and clinically evaluate patients for motor or verbal tics or Tourette’s syndrome before initiating ADDERALL XR [see Warnings and Precautions ( 5.9 )] . 2.2 General Administration Information Individualize the dosage according to the therapeutic needs and response of the patient. Administer ADDERALL XR at the lowest effective dosage. Based on bioequivalence data, patients taking divided doses of immediate-release ADDERALL, (for example, twice daily), may be switched to ADDERALL XR at the same total daily dose taken once daily. Titrate at weekly intervals to appropriate efficacy and tolerability as indicated. ADDERALL XR extended-release capsules may be taken whole, or the capsule may be opened and the entire contents sprinkled on applesauce. If the patient is using the sprinkle administration method, the sprinkled applesauce should be consumed immediately; it should not be stored. Patients should take the applesauce with sprinkled beads in its entirety without chewing. The dose of a single capsule should not be divided. The contents of the entire capsule should be taken, and patients should not take anything less than one capsule per day. ADDERALL XR may be taken orally with or without food. ADDERALL XR should be given upon awakening. Afternoon doses should be avoided because of the potential for insomnia. 2.3 Recommended Dosage in Pediatric Patients 6 to 12 Years In pediatric patients 6 to 12 years of age with ADHD and are either starting treatment for the first time or switching from another medication, start with 10 mg once daily in the morning; daily dosage may be adjusted in increments of 5 mg or 10 mg at weekly intervals. When in the judgment of the clinician a lower initial dose is appropriate, patients may begin treatment with 5 mg once daily in the morning. The maximum recommended dose for children 6 to 12 years of age is 30 mg/day; doses greater than 30 mg/day have not been studied in children. ADDERALL XR has not been studied in children under 6 years of age. 2.4 Recommended Dosage in Pediatric Patients 13 to 17 Years The recommended starting dose for pediatric patients 13 to 17 years of age with ADHD and are either starting treatment for the first time or switching from another medication is 10 mg/day. The dose may be increased to 20 mg/day after one week if ADHD symptoms are not adequately controlled. 2.5 Recommended Dosage in Adults In adults with ADHD who are either starting treatment for the first time or switching from another medication, the recommended dose is 20 mg/day. 2.6 Dosage in Patients with Renal Impairment In adult patients with severe renal impairment (GFR 15 to <30 mL/min/1.73 m 2 ), the recommended dose is 15 mg once daily in the morning. In pediatric patients (6 to 17 years of age) with severe renal impairment, the recommended dose is 5 mg once daily. The maximum dose for children 6 to 12 years of age with severe renal impairment is 20 mg once daily. ADDERALL XR is not recommended in patients with end stage renal disease (ESRD) (GFR <15 mL/min/1.73 m 2 ) [see Use in Specific Populations ( 8.6 ), Clinical Pharmacology ( 12.3 )] . 2.7 Dosage Modification due to Drug Interactions Agents that alter urinary pH can impact excretion and alter blood levels of amphetamines. Acidifying agents (e.g., ascorbic acid) decrease blood levels; adjust ADDERALL XR dosage based on clinical response [see Drug Interactions ( 7 )] .

6 ADVERSE REACTIONS The following adverse reactions are discussed in greater detail in other sections of the labeling: Abuse, Misuse, and Addiction [see Boxed Warning , Warnings and Precautions ( 5.1 ), Drug Abuse and Dependence ( 9.2 , 9.3 )] Risks to Patients with Serious Cardiac Disease [see Warnings and Precautions ( 5.2 )] Increased Blood Pressure and Heart Rate [see Warnings and Precautions ( 5.3 )] Psychiatric Adverse Reactions [see Warnings and Precautions ( 5.4 )] Long-Term Suppression of Growth in Pediatric Patients [see Warnings and Precautions ( 5.5 )] Seizures [see Warnings and Precautions ( 5.6 )] Peripheral Vasculopathy, including Raynaud’s Phenomenon [see Warnings and Precautions ( 5.7 )] Serotonin Syndrome [see Warnings and Precautions ( 5.8 )] Motor and Verbal Tics, and Worsening of Tourette’s Syndrome [see Warnings and Precautions ( 5.9 )] Pediatric patients ages 6 to 12: Most common adverse reactions (≥5% and with a higher incidence than on placebo) were loss of appetite, insomnia, abdominal pain, emotional lability, vomiting, nervousness, nausea, and fever. ( 6.1 ) Pediatric patients ages 13 to 17: Most common adverse reactions (≥5% and with a higher incidence than on placebo) were loss of appetite, insomnia, abdominal pain, weight loss, and nervousness. ( 6.1 ) Adults: Most common adverse reactions ≥5% and with a higher incidence than on placebo were dry mouth, loss of appetite, insomnia, headache, weight loss, nausea, anxiety, agitation, dizziness, tachycardia, diarrhea, asthenia, and urinary tract infections. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Takeda Pharmaceuticals U.S.A., Inc. at 1-877-TAKEDA-7 (1-877-825-3327) 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. The premarketing development program for ADDERALL XR included exposures in a total of 1,315 participants in clinical trials (635 pediatric patients, 350 adolescent patients, 248 adult patients, and 82 healthy adult subjects). Of these, 635 patients (ages 6 to 12) were evaluated in two controlled clinical studies, one open-label clinical study, and two single-dose clinical pharmacology studies (N=40). Safety data on all patients are included in the discussion that follows. Adverse reactions were assessed by collecting adverse reactions, results of physical examinations, vital signs, weights, laboratory analyses, and ECGs. Adverse reactions during exposure were obtained primarily by general inquiry and recorded by clinical investigators using terminology of their own choosing. Consequently, it is not possible to provide a meaningful estimate of the proportion of individuals experiencing adverse reactions without first grouping similar types of reactions into a smaller number of standardized event categories. In the tables and listings that follow, COSTART terminology has been used to classify reported adverse reactions. The stated frequencies of adverse reactions represent the proportion of individuals who experienced, at least once, a treatment-emergent adverse event of the type listed. Adverse Reactions Leading to Discontinuation of Treatment In two placebo-controlled studies of up to 5 weeks duration among children with ADHD, 2.4% (10/425) of ADDERALL XR-treated patients discontinued due to adverse reactions (including three patients with loss of appetite, one of whom also reported insomnia) compared to 2.7% (7/259) receiving placebo. The most frequent adverse reactions leading to discontinuation of ADDERALL XR in controlled and uncontrolled, multiple-dose clinical trials of children (N=595) were anorexia (loss of appetite) (2.9%), insomnia (1.5%), weight loss (1.2%), emotional lability (1%), and depression (0.7%). Over half of these patients were exposed to ADDERALL XR for 12 months or more. In a separate placebo-controlled 4 week study in adolescents with ADHD, five patients (2.1%) discontinued treatment due to adverse events among ADDERALL XR-treated patients (N=233) compared to none who received placebo (N=54). The most frequent adverse event leading to discontinuation and considered to be drug-related (i.e., leading to discontinuation in at least 1% of ADDERALL XR-treated patients and at a rate at least twice that of placebo) was insomnia (1.3%, n=3). In one placebo-controlled 4 week study among adults with ADHD with doses 20 to 60 mg, 23 patients (12.0%) discontinued treatment due to adverse events among ADDERALL XR-treated patients (N=191) compared to one patient (1.6%) who received placebo (N=64). The most frequent adverse events leading to discontinuation and considered to be drug-related (i.e., leading to discontinuation in at least 1% of ADDERALL XR-treated patients and at a rate at least twice that of placebo) were insomnia (5.2%, n=10), anxiety (2.1%, n=4), nervousness (1.6%, n=3), dry mouth (1.6%, n=3), anorexia (1.6%, n=3), tachycardia (1.6%, n=3), headache (1.6%, n=3), and asthenia (1.0%, n=2). Adverse Reactions Occurring in Controlled Trials Adverse reactions reported in a 3 week clinical trial of children and a 4 week clinical trial in adolescents and adults, respectively, treated with ADDERALL XR or placebo are presented in the tables below. Table 1: Adverse Reactions Reported by 2% or More of Children (6 to 12 Years Old) Receiving ADDERALL XR with Higher Incidence than on Placebo in a 584 Patient Clinical Study Body System Preferred Term ADDERALL XR (n=374) Placebo (n=210) General Abdominal Pain (stomachache) Fever Infection Accidental Injury Asthenia (fatigue) 14% 5% 4% 3% 2% 10% 2% 2% 2% 0% Digestive System Loss of Appetite Vomiting Nausea Dyspepsia 22% 7% 5% 2% 2% 4% 3% 1% Nervous System Insomnia Emotional Lability Nervousness Dizziness 17% 9% 6% 2% 2% 2% 2% 0% Metabolic/Nutritional Weight Loss 4% 0% Table 2: Adverse Reactions Reported by 5% or More of Adolescents (13 to 17 Years Old) Weighing ≤75 kg/165 lbs Receiving ADDERALL XR with Higher Incidence than Placebo in a 287 Patient Clinical Forced Weekly-Dose Titration Study Included doses up to 40 mg. Body System Preferred Term ADDERALL XR (n=233) Placebo (n=54) Note: The following reactions did not meet the criterion for inclusion in Table 2 but were reported by 2 to 4% of adolescent patients receiving ADDERALL XR with a higher incidence than patients receiving placebo in this study: accidental injury, asthenia (fatigue), dry mouth, dyspepsia, emotional lability, nausea, somnolence, and vomiting. General Abdominal Pain (stomachache) 11% 2% Digestive System Loss of Appetite Dose-related adverse reactions. 36% 2% Nervous System Insomnia 12% 4% Nervousness 6% 6% Appears the same due to rounding. Metabolic/Nutritional Weight Loss 9% 0% Table 3: Adverse Reactions Reported by 5% or More of Adults Receiving ADDERALL XR with Higher Incidence than on Placebo in a 255 Patient Clinical Forced Weekly-Dose Titration Study Included doses up to 60 mg. Body System Preferred Term ADDERALL XR (n=191) Placebo (n=64) Note: The following reactions did not meet the criterion for inclusion in Table 3 but were reported by 2 to 4% of adult patients receiving ADDERALL XR with a higher incidence than patients receiving placebo in this study: infection, photosensitivity reaction, constipation, tooth disorder (e.g., teeth clenching, tooth infection), emotional lability, libido decreased, somnolence, speech disorder (e.g., stuttering, excessive speech), palpitation, twitching, dyspnea, sweating, dysmenorrhea, and impotence. General Headache Asthenia 26% 6% 13% 5% Digestive System Dry Mouth Loss of Appetite Nausea Diarrhea 35% 33% 8% 6% 5% 3% 3% 0% Nervous System Insomnia Agitation Anxiety Dizziness Nervousness 27% 8% 8% 7% 13% 13% 5% 5% 0% 13% Appears the same due to rounding. Cardiovascular System Tachycardia 6% 3% Metabolic/Nutritional Weight Loss 10% 0% Urogenital System Urinary Tract Infection 5% 0% Hypertension In a controlled 4 week outpatient clinical study of adolescents with ADHD, isolated systolic blood pressure elevations ≥15 mmHg were observed in 7/64 (11%) placebo-treated patients and 7/100 (7%) patients receiving ADDERALL XR 10 or 20 mg. Isolated elevations in diastolic blood pressure ≥8 mmHg were observed in 16/64 (25%) placebo-treated patients and 22/100 (22%) ADDERALL XR-treated patients. Similar results were observed at higher doses [see Warnings and Precautions ( 5.2 )]. In a single-dose pharmacokinetic study in 23 adolescents with ADHD, isolated increases in systolic blood pressure (above the upper 95% CI for age, gender, and stature) were observed in 2/17 (12%) and 8/23 (35%), subjects administered 10 and 20 mg ADDERALL XR, respectively. Higher single doses were associated with a greater increase in systolic blood pressure. All increases were transient, appeared maximal at 2 to 4 hours postdose and, not associated with symptoms. 6.2 Adverse Reactions Associated with the Use of Amphetamine, ADDERALL XR, or Adderall The following adverse reactions have been identified during postapproval use of amphetamine, ADDERALL XR, or Adderall. 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. Allergic: Urticaria, rash, hypersensitivity reactions including angioedema and anaphylaxis. Serious skin rashes, including Stevens-Johnson syndrome and toxic epidermal necrolysis have been reported. Cardiovascular: Palpitations. There have been isolated reports of cardiomyopathy associated with chronic amphetamine use. Central Nervous System: Psychotic episodes at recommended doses, overstimulation, restlessness, irritability, euphoria, dyskinesia, dysphoria, depression, tremor, motor and verbal tics, aggression, anger, logorrhea, dermatillomania, paresthesia (including formication), and bruxism. Endocrine: Impotence, changes in libido, frequent or prolonged erections. Eye Disorders: Vision blurred, mydriasis. Gastrointestinal: Unpleasant taste, constipation, intestinal ischemia, and other gastrointestinal disturbances. Musculoskeletal and Connective Tissue Disorders: Rhabdomyolysis. Skin: Alopecia. Vascular Disorders: Raynaud’s phenomenon.

12.3 Pharmacokinetics Pharmacokinetic studies of ADDERALL XR have been conducted in healthy adult and pediatric (children aged 6 to 12 yrs) subjects, adolescent (13 to 17 yrs), and children with ADHD. Both Adderall (immediate-release) tablets and ADDERALL XR extended-release capsules contain d-amphetamine and l-amphetamine salts in the ratio of 3:1. Following administration of Adderall (immediate-release), the peak plasma concentrations occurred in about 3 hours for both d-amphetamine and l-amphetamine. The time to reach maximum plasma concentration (T max ) for ADDERALL XR is about 7 hours, which is about 4 hours longer compared to Adderall (immediate-release). This is consistent with the extended-release nature of the product. Figure 1: Mean d-amphetamine and l-amphetamine Plasma Concentrations Following Administration of ADDERALL XR 20 mg (8 am) and Adderall (immediate-release) 10 mg Twice Daily (8 am and 12 noon) in the Fed State. A single dose of ADDERALL XR 20 mg extended-release capsules provided comparable plasma concentration profiles of both d-amphetamine and l-amphetamine to Adderall (immediate-release) 10 mg twice daily administered 4 hours apart. The mean elimination half-life for d-amphetamine is 10 hours in adults; 11 hours in adolescents aged 13 to 17 years and weighing less than or equal to 75 kg/165 lbs; and 9 hours in children aged 6 to 12 years. For the l-amphetamine, the mean elimination half-life in adults is 13 hours; 13 to 14 hours in adolescents; and 11 hours in children aged 6 to 12 years. On a mg/kg body weight basis, children have a higher clearance than adolescents or adults (see Special Populations ) . ADDERALL XR demonstrates linear pharmacokinetics over the dose range of 20 to 60 mg in adults and adolescents weighing greater than 75 kg/165 lbs, over the dose range of 10 to 40 mg in adolescents weighing less than or equal to 75 kg/165 lbs, and 5 to 30 mg in children aged 6 to 12 years. There is no unexpected accumulation at steady state in children. Food does not affect the extent of absorption of d-amphetamine and l-amphetamine, but prolongs T max by 2.5 hours (from 5.2 hrs at fasted state to 7.7 hrs after a high-fat meal) for d-amphetamine and 2.7 hours (from 5.6 hrs at fasted state to 8.3 hrs after a high-fat meal) for l-amphetamine after administration of ADDERALL XR 30 mg. Opening the capsule and sprinkling the contents on applesauce results in comparable absorption to the intact capsule taken in the fasted state. Equal doses of ADDERALL XR strengths are bioequivalent. Metabolism and Excretion Amphetamine is reported to be oxidized at the 4 position of the benzene ring to form 4-hydroxyamphetamine, or on the side chain α or β carbons to form alpha-hydroxy-amphetamine or norephedrine, respectively. Norephedrine and 4-hydroxy-amphetamine are both active and each is subsequently oxidized to form 4-hydroxy-norephedrine. Alpha-hydroxy-amphetamine undergoes deamination to form phenylacetone, which ultimately forms benzoic acid and its glucuronide and the glycine conjugate hippuric acid. Although the enzymes involved in amphetamine metabolism have not been clearly defined, CYP2D6 is known to be involved with formation of 4-hydroxy-amphetamine. Since CYP2D6 is genetically polymorphic, population variations in amphetamine metabolism are a possibility. Amphetamine is known to inhibit monoamine oxidase, whereas the ability of amphetamine and its metabolites to inhibit various P450 isozymes and other enzymes has not been adequately elucidated. In vitro experiments with human microsomes indicate minor inhibition of CYP2D6 by amphetamine and minor inhibition of CYP1A2, 2D6, and 3A4 by one or more metabolites. However, due to the probability of auto-inhibition and the lack of information on the concentration of these metabolites relative to in vivo concentrations, no predications regarding the potential for amphetamine or its metabolites to inhibit the metabolism of other drugs by CYP isozymes in vivo can be made. With normal urine pHs, approximately half of an administered dose of amphetamine is recoverable in urine as derivatives of alpha-hydroxy-amphetamine and approximately another 30 to 40% of the dose is recoverable in urine as amphetamine itself. Since amphetamine has a pKa of 9.9, urinary recovery of amphetamine is highly dependent on pH and urine flow rates. Alkaline urine pHs result in less ionization and reduced renal elimination, and acidic pHs and high flow rates result in increased renal elimination with clearances greater than glomerular filtration rates, indicating the involvement of active secretion. Urinary recovery of amphetamine has been reported to range from 1 to 75%, depending on urinary pH, with the remaining fraction of the dose hepatically metabolized. Consequently, both hepatic and renal dysfunction have the potential to inhibit the elimination of amphetamine and result in prolonged exposures. In addition, drugs that effect urinary pH are known to alter the elimination of amphetamine, and any decrease in amphetamine's metabolism that might occur due to drug interactions or genetic polymorphisms is more likely to be clinically significant when renal elimination is decreased [see Drug Interactions ( 7 )] . Special Populations Comparison of the pharmacokinetics of d- and l-amphetamine after oral administration of ADDERALL XR in children (6 to 12 years) and adolescent (13 to 17 years) ADHD patients and healthy adult volunteers indicates that body weight is the primary determinant of apparent differences in the pharmacokinetics of d- and l-amphetamine across the age range. Systemic exposure measured by area under the curve to infinity (AUC ∞ ) and maximum plasma concentration (C max ) decreased with increases in body weight, while oral volume of distribution (V Z /F), oral clearance (CL/F), and elimination half-life (t 1/2 ) increased with increases in body weight. Pediatric Patients On a mg/kg weight basis, children eliminated amphetamine faster than adults. The elimination half-life (t 1/2 ) is approximately 1 hour shorter for d-amphetamine and 2 hours shorter for l-amphetamine in children than in adults. However, children had higher systemic exposure to amphetamine (C max and AUC) than adults for a given dose of ADDERALL XR, which was attributed to the higher dose administered to children on a mg/kg body weight basis compared to adults. Upon dose normalization on a mg/kg basis, children showed 30% less systemic exposure compared to adults. Gender Systemic exposure to amphetamine was 20 to 30% higher in women (N=20) than in men (N=20) due to the higher dose administered to women on a mg/kg body weight basis. When the exposure parameters (C max and AUC) were normalized by dose (mg/kg), these differences diminished. Age and gender had no direct effect on the pharmacokinetics of d- and l-amphetamine. Race Formal pharmacokinetic studies for race have not been conducted. However, amphetamine pharmacokinetics appeared to be comparable among Caucasians (N=33), Blacks (N=8), and Hispanics (N=10). Patients with Renal Impairment The effect of renal impairment on d- and l-amphetamine after administration of ADDERALL XR has not been studied. The impact of renal impairment on the disposition of amphetamine is expected to be similar between oral administration of lisdexamfetamine and ADDERALL XR. In a pharmacokinetic study of lisdexamfetamine in adult subjects with normal and impaired renal function, mean d-amphetamine clearance was reduced from 0.7 L/hr/kg in normal subjects to 0.4 L/hr/kg in subjects with severe renal impairment (GFR 15 to <30 mL/min/1.73 m 2 ). Dialysis did not significantly affect the clearance of d-amphetamine [see Use in Specific Populations ( 8.6 )] . Figure 1