DEXTROAMPHETAMINE SACCHARATE, AMPHETAMINE ASPARTATE MONOHYDRATE, DEXTROAMPHETAMINE SULFATE AND AMPHETAMINE SULFATE

Dextroamphetamine Saccharate, Amphetamine Aspartate Monohydrate, Dextroamphetamine Sulfate and Amphetamine Sulfate Extended-Release Capsules contain mixed salts of a single-entity amphetamine, a CNS stimulant. Dextroamphetamine Saccharate, Amphetamine Aspartate Monohydrate, Dextroamphetamine Sulfate and Amphetamine Sulfate Extended-Release Capsules contain equal amounts (by weight) of four salts: dextroamphetamine sulfate, amphetamine sulfate, dextroamphetamine saccharate and amphetamine (D, L)-aspartate monohydrate. This results in a 3.1:1 mixture of dextro- to levo-amphetamine base equivalent. The 5 mg, 10 mg, 15 mg, 20 mg, 25 mg, and 30 mg strength extended-release capsules are for oral administration. Dextroamphetamine Saccharate, Amphetamine Aspartate Monohydrate, Dextroamphetamine Sulfate and Amphetamine Sulfate Extended-Release Capsules contain two types of drug-containing beads (immediate-release and delayed-release) which prolong the release of amphetamine compared to the Dextroamphetamine Saccharate, Amphetamine Aspartate Monohydrate, Dextroamphetamine Sulfate and Amphetamine Sulfate (immediate-release) tablet formulation. Each capsule contains: Capsule Strength 5 mg 10 mg 15 mg 20 mg 25 mg 30 mg Dextroamphetamine Saccharate 1.25 mg 2.5 mg 3.75 mg 5 mg 6.25 mg 7.5 mg Amphetamine (D, L)-Aspartate Monohydrate 1.25 mg 2.5 mg 3.75 mg 5 mg 6.25 mg 7.5 mg Dextroamphetamine Sulfate 1.25 mg 2.5 mg 3.75 mg 5 mg 6.25 mg 7.5 mg Amphetamine Sulfate 1.25 mg 2.5 mg 3.75 mg 5 mg 6.25 mg 7.5 mg Total amphetamine base equivalence 3.1 mg 6.3 mg 9.4 mg 12.5 mg 15.6 mg 18.8 mg d-amphetamine base equivalence 2.4 mg 4.7 mg 7.1 mg 9.5 mg 11.9 mg 14.2 mg l-amphetamine base equivalence 0.75 mg 1.5 mg 2.3 mg 3.0 mg 3.8 mg 4.5 mg Inactive Ingredients and Colors The inactive ingredients in Dextroamphetamine Saccharate, Amphetamine Aspartate Monohydrate, Dextroamphetamine Sulfate and Amphetamine Sulfate Extended-Release Capsules include: corn starch, gelatin, hypromellose, methacrylic acid copolymer, opadry beige, opadry white, sucrose, talc, and triethyl citrate. Gelatin capsules contain edible inks, kosher gelatin, and titanium dioxide. The 5 mg capsules also contain FD&C Blue #2. The 10 mg and 15 mg capsules contain FD&C Blue #1 and FD&C Red #40. The 20 mg, 25 mg, and 30 mg capsules also contain red iron oxide and yellow iron oxide. The black imprinting ink contains ferrosoferric oxide and shellac, and may also contain ammonia solution and potassium hydroxide, or D&C Yellow #10 aluminum lake, FD&C Blue #1 aluminum lake, FD&C Blue #2 aluminum lake, and FD&C Red #40 aluminum lake.

Dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules, a CNS stimulant, are 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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules are 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 Dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules are 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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules are 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 )] .

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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules, 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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules [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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules at the lowest effective dosage. Based on bioequivalence data, patients taking divided doses of immediate-release dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate capsules, (for example, twice daily), may be switched to dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules at the same total daily dose taken once daily. Titrate at weekly intervals to appropriate efficacy and tolerability as indicated. Dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate 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. Dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules may be taken orally with or without food. Dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules 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. Dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules have 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. Dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules are 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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules dosage based on clinical response [see Drug Interactions ( 7 )] .

Dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules administration is contraindicated in patients: known to be hypersensitive to amphetamine, or other components of dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules. Hypersensitivity reactions such as angioedema and anaphylactic reactions have been reported in patients treated with other amphetamine products [see Adverse Reactions ( 6.2 )] . taking monoamine oxidase inhibitors (MAOIs), or within 14 days of stopping MAOIs (including MAOIs such as linezolid or intravenous methylene blue), because of an increased risk of hypertensive crisis [see Warnings and Precautions ( 5. 8 ), Drug Interactions ( 7.1 )] . Known hypersensitivity or idiosyncrasy to amphetamine. ( 4 ) During or within 14 days following the administration of monoamine oxidase inhibitors (MAOI). ( 4 , 7.1 )

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 Lannett Company, Inc. at 1-844-834-0530 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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules 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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules-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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules 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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules 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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules-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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules-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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules-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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules-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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules 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 Dextroamphetamine Saccharate, Amphetamine Aspartate Monohydrate, Dextroamphetamine Sulfate and Amphetamine Sulfate Extended-Release Capsules with Higher Incidence Than on Placebo in a 584 Patient Clinical Study Body System Preferred Term Dextroamphetamine Saccharate, Amphetamine Aspartate Monohydrate, Dextroamphetamine Sulfate and Amphetamine Sulfate Extended-Release Capsules (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 Dextroamphetamine Saccharate, Amphetamine Aspartate Monohydrate, Dextroamphetamine Sulfate and Amphetamine Sulfate Extended-Release Capsules with Higher Incidence Than Placebo in a 287 Patient Clinical Forced Weekly-Dose Titration Study* Body System Preferred Term Dextroamphetamine Saccharate, Amphetamine Aspartate Monohydrate, Dextroamphetamine Sulfate and Amphetamine Sulfate Extended-Release Capsules (n=233) Placebo (n=54) General Abdominal Pain (stomachache) 11% 2% Digestive System Loss of Appetite b 36% 2% Nervous System Insomnia b Nervousness 12% 6% 4% 6% a Metabolic/Nutritional Weight Loss b 9% 0% 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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules with a higher incidence than patients receiving placebo in this study: accidental injury, asthenia (fatigue), dry mouth, dyspepsia, emotional lability, nausea, somnolence, and vomiting. *Included doses up to 40 mg. a Appears the same due to rounding. b Dose-related adverse reactions. Table 3: Adverse Reactions Reported by 5% or More of Adults Receiving Dextroamphetamine Saccharate, Amphetamine Aspartate Monohydrate, Dextroamphetamine Sulfate and Amphetamine Sulfate Extended-Release Capsules with Higher Incidence Than on Placebo in a 255 Patient Clinical Forced Weekly-Dose Titration Study* Body System Preferred Term Dextroamphetamine Saccharate, Amphetamine Aspartate Monohydrate, Dextroamphetamine Sulfate and Amphetamine Sulfate Extended-Release Capsules (n=191) Placebo (n=64) 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% a Cardiovascular System Tachycardia 6% 3% Metabolic/Nutritional Weight Loss 10% 0% Urogenital System Urinary Tract Infection 5% 0% 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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules 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. *Included doses up to 60 mg. a Appears the same due to rounding. 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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules 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%) dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules-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 dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules, 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 or Dextroamphetamine Saccharate, Amphetamine Aspartate Monohydrate, Dextroamphetamine Sulfate and Amphetamine Sulfate Extended-Release Capsules The following adverse reactions have been identified during postapproval use of amphetamine or dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules. 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.

Alkalinizing agents (GI antacids and urinary): These agents increase blood levels of amphetamine. ( 2.7 , 7.1 ) Acidifying agents (GI and urinary): These agents reduce blood levels of amphetamine. ( 7.1 ) 7.1 Clinically Important Interactions with Amphetamines Table 4: Drugs Having Clinically Important Interactions with Amphetamines Monoamine Oxidase Inhibitors (MAOIs) Clinical Impact Concomitant use of MAOIs and CNS stimulants can cause hypertensive crisis. Potential outcomes include death, stroke, myocardial infarction, aortic dissection, ophthalmological complications, eclampsia, pulmonary edema, and renal failure. Intervention Do not administer dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules concomitantly or within 14 days after discontinuing MAOI [see Contraindications ( 4 )] . Serotonergic Drugs Clinical Impact The concomitant use of dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules and serotonergic drugs increases the risk of serotonin syndrome. Intervention Initiate with lower doses and monitor patients for signs and symptoms of serotonin syndrome, particularly during dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules initiation or dosage increase. If serotonin syndrome occurs, discontinue dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules and the concomitant serotonergic drug(s) [see Warnings and Precautions ( 5.8 )] . CYP2D6 Inhibitors Clinical Impact The concomitant use of dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules and CYP2D6 inhibitors may increase the exposure of dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules compared to the use of the drug alone and increase the risk of serotonin syndrome. Intervention Initiate with lower doses and monitor patients for signs and symptoms of serotonin syndrome particularly during dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules initiation and after a dosage increase. If serotonin syndrome occurs, discontinue dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules and the CYP2D6 inhibitor [see Warnings and Precautions ( 5.8 ), Overdosage ( 10 )] . Alkalinizing Agents Clinical Impact Increase blood levels and potentiate the action of amphetamine. Intervention Coadministration of dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules and gastrointestinal or urinary alkalinizing agents should be avoided. Acidifying Agents Clinical Impact Lower blood levels and efficacy of amphetamines. Intervention Increase dose based on clinical response. Tricyclic Antidepressants Clinical Impact May enhance the activity of tricyclic or sympathomimetic agents causing striking and sustained increases in the concentration of d-amphetamine in the brain; cardiovascular effects can be potentiated. Intervention Monitor frequently and adjust or use alternative therapy based on clinical response. Proton Pump Inhibitors Clinical Impact Time to maximum concentration (T max ) of amphetamine is decreased compared to when administered alone. Intervention Monitor patients for changes in clinical effect and adjust therapy based on clinical response. 7.2 Drug-Laboratory Test Interactions Amphetamines can cause a significant elevation in plasma corticosteroid levels. This increase is greatest in the evening. Amphetamines may interfere with urinary steroid determinations.