Drug Facts
Composition & Profile
Identifiers & Packaging
HOW SUPPLIED Dextroamphetamine Sulfate Extended-Release Capsules Each capsule, with white opaque cap and white opaque body, contains dextroamphetamine sulfate. The 5 mg capsule is imprinted with an ® on the cap and is imprinted 8960 5 mg on the body in black. The 10 mg capsule is imprinted with an ® on the cap and is imprinted 8961 10 mg on the body in blue. The 15 mg capsule is imprinted with an ® on the cap and is imprinted 8962 15 mg on the body in pink. 5 mg Bottles of 100……………….NDC 0406-8960-01 10 mg Bottles of 100……………….NDC 0406-8961-01 15 mg Bottles of 100……………….NDC 0406-8962-01 Store at controlled room temperature between 20° to 25°C (68° to 77°F) [see USP]. Dispense in a tight, light-resistant container with a child-resistant closure. Mallinckrodt, the “M” brand mark, the Mallinckrodt Pharmaceuticals logo and are trademarks of a Mallinckrodt company. © 2025 Mallinckrodt. SpecGx LLC Webster Groves, MO 63119 USA Rev 09/2025 Mallinckrodt™ Pharmaceuticals Boxed M Boxed M Boxed M Boxed M; PACKAGE LABEL - PRINCIPAL DISPLAY PANEL - 5 mg capsule NDC 0406-8960-01 100 CAPSULES Dextroamphetamine Sulfate Extended-Release Capsules CII 5 mg Rx only Each capsule contains: Dextroamphetamine Sulfate USP......... 5 mg PHARMACIST: Dispense the Medication Guide provided separately to each patient. Mallinckrodt™ L00D35 Rev 09/2017 5 mg; PACKAGE LABEL - PRINCIPAL DISPLAY PANEL - 10 mg capsule NDC 0406-8961-01 100 CAPSULES Dextroamphetamine Sulfate Extended-Release Capsules CII 10 mg Rx only Each capsule contains: Dextroamphetamine Sulfate USP......... 10 mg PHARMACIST: Dispense the Medication Guide provided separately to each patient. Mallinckrodt™ L00D38 Rev 09/2017 10 mg; PACKAGE LABEL - PRINCIPAL DISPLAY PANEL - 15 mg capsule NDC 0406-8962-01 100 CAPSULES Dextroamphetamine Sulfate Extended-Release Capsules CII 15 mg Rx only Each capsule contains: Dextroamphetamine Sulfate USP......... 15 mg PHARMACIST: Dispense the Medication Guide provided separately to each patient. Mallinckrodt™ L00D41 Rev 09/2017 15 mg
- HOW SUPPLIED Dextroamphetamine Sulfate Extended-Release Capsules Each capsule, with white opaque cap and white opaque body, contains dextroamphetamine sulfate. The 5 mg capsule is imprinted with an ® on the cap and is imprinted 8960 5 mg on the body in black. The 10 mg capsule is imprinted with an ® on the cap and is imprinted 8961 10 mg on the body in blue. The 15 mg capsule is imprinted with an ® on the cap and is imprinted 8962 15 mg on the body in pink. 5 mg Bottles of 100……………….NDC 0406-8960-01 10 mg Bottles of 100……………….NDC 0406-8961-01 15 mg Bottles of 100……………….NDC 0406-8962-01 Store at controlled room temperature between 20° to 25°C (68° to 77°F) [see USP]. Dispense in a tight, light-resistant container with a child-resistant closure. Mallinckrodt, the “M” brand mark, the Mallinckrodt Pharmaceuticals logo and are trademarks of a Mallinckrodt company. © 2025 Mallinckrodt. SpecGx LLC Webster Groves, MO 63119 USA Rev 09/2025 Mallinckrodt™ Pharmaceuticals Boxed M Boxed M Boxed M Boxed M
- PACKAGE LABEL - PRINCIPAL DISPLAY PANEL - 5 mg capsule NDC 0406-8960-01 100 CAPSULES Dextroamphetamine Sulfate Extended-Release Capsules CII 5 mg Rx only Each capsule contains: Dextroamphetamine Sulfate USP......... 5 mg PHARMACIST: Dispense the Medication Guide provided separately to each patient. Mallinckrodt™ L00D35 Rev 09/2017 5 mg
- PACKAGE LABEL - PRINCIPAL DISPLAY PANEL - 10 mg capsule NDC 0406-8961-01 100 CAPSULES Dextroamphetamine Sulfate Extended-Release Capsules CII 10 mg Rx only Each capsule contains: Dextroamphetamine Sulfate USP......... 10 mg PHARMACIST: Dispense the Medication Guide provided separately to each patient. Mallinckrodt™ L00D38 Rev 09/2017 10 mg
- PACKAGE LABEL - PRINCIPAL DISPLAY PANEL - 15 mg capsule NDC 0406-8962-01 100 CAPSULES Dextroamphetamine Sulfate Extended-Release Capsules CII 15 mg Rx only Each capsule contains: Dextroamphetamine Sulfate USP......... 15 mg PHARMACIST: Dispense the Medication Guide provided separately to each patient. Mallinckrodt™ L00D41 Rev 09/2017 15 mg
Overview
Dextroamphetamine sulfate extended-release capsule is the dextro isomer of the compound d,l -amphetamine sulfate, a sympathomimetic amine of the amphetamine group. Chemically, dextroamphetamine is d -alpha-methylphenethylamine, and is present in all forms of dextroamphetamine sulfate extended-release capsules as the neutral sulfate. Structural formula: Chemical Structure Dextroamphetamine Sulfate Extended-Release Capsules Each dextroamphetamine sulfate extended-release capsule is so prepared that an initial dose is released promptly and the remaining medication is released gradually over a prolonged period. Each capsule, with white opaque cap and white opaque body, contains dextroamphetamine sulfate USP. The 5 mg capsule is imprinted with an ® on the cap and is imprinted 8960 5 mg on the body in black. The 10 mg capsule is imprinted with an ® on the cap and is imprinted 8961 10 mg on the body in blue. The 15 mg capsule is imprinted with an ® on the cap and is imprinted 8962 15 mg on the body in pink. Inactive ingredients consist of sugar spheres, titanium dioxide, gelatin, shellac glaze-45%, SD-45 alcohol, iron oxide black, propylene glycol, FD&C Blue #2/Indigo Carmine Lake, FD&C Red #40/Allura Red AC Lake, FD&C Blue #1/Brilliant Blue FCF Lake, D&C Yellow #10 Lake, SD3A alcohol, shellac, dehydrated alcohol, isopropyl alcohol, butyl alcohol, strong ammonia solution, FD&C Blue #2 Aluminum Lake, D&C Red #7 Calcium Lake, hydroxypropyl methylcellulose/hypromellose, macrogol/polyethylene glycol, purified water, ethylcellulose, ammonium hydroxide 28%, medium chain triglycerides, oleic acid. Boxed M Boxed M Boxed M
Indications & Usage
Dextroamphetamine sulfate extended-release capsules are indicated in: Narcolepsy Attention Deficit Disorder with Hyperactivity As an integral part of a total treatment program that typically includes other measures (psychological, educational, social) for patients (ages 6 years to 16 years) with this syndrome. A diagnosis of Attention Deficit Hyperactivity Disorder (ADHD; DSM-IV) implies the presence of the hyperactive-impulsive or inattentive symptoms that caused impairment and were present before age 7 years. The symptoms must cause clinically significant impairment, e.g., in social, academic, or occupational functioning, and be present in 2 or more settings, e.g., school (or work) and at home. The symptoms must not be better accounted for by another mental disorder. For the Inattentive Type, at least 6 of the following symptoms must have persisted for at least 6 months: lack of attention to details/careless mistakes; lack of sustained attention; poor listener; failure to follow through on tasks; poor organization; avoids tasks requiring sustained mental effort; loses things; easily distracted; forgetful. For the Hyperactive-Impulsive Type, at least 6 of the following symptoms must have persisted for at least 6 months: fidgeting/squirming; leaving seat; inappropriate running/climbing; difficulty with quiet activities; “on the go”; excessive talking; blurting answers; can’t wait turn; intrusive. The Combined Type requires both inattentive and hyperactive-impulsive criteria to be met. Special Diagnostic Considerations Specific etiology of this syndrome is unknown, and there is no single diagnostic test. Adequate diagnosis requires the use of medical and special psychological, educational, and social resources. Learning may or may not be impaired. The diagnosis must be based upon a complete history and evaluation of the patient and not solely on the presences of the required number of DSM-IV characteristics. Need for Comprehensive Treatment Program Dextroamphetamine sulfate extended-release capsules are indicated as an integral part of a total treatment program for ADHD that may include other measures (psychological, educational, social) for patients with this syndrome. Drug treatment may not be indicated for all patients with this syndrome. Stimulants are not intended for use in patients who exhibit symptoms secondary to environmental factors and/or other primary psychiatric disorders, including psychosis. Appropriate educational placement is essential and psychosocial intervention is often helpful. When remedial measures alone are insufficient, the decision to prescribe stimulant medication will depend upon the physician’s assessment of the chronicity and severity of the patient’s symptoms. Limitations of Use The use of dextroamphetamine sulfate extended-release capsules 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 PRECAUTIONS, Pediatric Use ).
Dosage & Administration
Amphetamines should be administered at the lowest effective dosage and dosage should be individually adjusted. Late evening doses should be avoided because of the resulting insomnia. Prior to treating patients with dextroamphetamine 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 ). the family history and clinically evaluate patients for motor or verbal tics or Tourette’s syndrome ( see WARNINGS ). Narcolepsy Usual dose is 5 to 60 mg per day in divided doses, depending on the individual patient response. Narcolepsy seldom occurs in children under 12 years of age; however, when it does, dextroamphetamine sulfate extended-release capsules may be used. The suggested initial dose for patients aged 6 to 12 is 5 mg daily; daily dose may be raised in increments of 5 mg at weekly intervals until an optimal response is obtained. In patients 12 years of age and older, start with 10 mg daily; daily dosage may be raised in increments of 10 mg at weekly intervals until an optimal response is obtained. If bothersome adverse reactions appear (e.g., insomnia or anorexia), dosage should be reduced. Dextroamphetamine sulfate extended-release capsules may be used for once-a-day dosage wherever appropriate. Attention Deficit Disorder with Hyperactivity The dextroamphetamine sulfate extended-release capsule formulation is not recommended for pediatric patients younger than 6 years of age. In pediatric patients 6 years of age and older, start with 5 mg once or twice daily; daily dosage may be raised in increments of 5 mg at weekly intervals until optimal response is obtained. Only in rare cases will it be necessary to exceed a total of 40 mg per day. Dextroamphetamine sulfate extended-release capsules may be used for once-a-day dosage wherever appropriate.
Warnings & Precautions
WARNINGS Abuse, Misuse, and Addiction Dextroamphetamine sulfate extended-release capsules have a high potential for abuse and misuse. The use of dextroamphetamine sulfate extended-release capsules exposes individuals to the risks of abuse and misuse, which can lead to the development of a substance use disorder, including addiction. Dextroamphetamine sulfate extended-release capsules can be diverted for non-medical use into illicit channels or distribution ( see DRUG ABUSE AND DEPENDENCE ). Misuse and abuse of CNS stimulants, including dextroamphetamine sulfate extended-release capsules, can result in overdose and death ( see OVERDOSAGE ), and this risk is increased with higher doses or unapproved methods of administration, such as snorting or injection. Before prescribing dextroamphetamine sulfate extended-release capsules, assess each patient’s risk for abuse, misuse, and addiction. Educate patients and their families about these risks and proper disposal of any unused drug. Advise patients to store amphetamine sulfate in a safe place, preferably locked, and instruct patients to not give dextroamphetamine sulfate extended-release capsules to anyone else. Throughout dextroamphetamine sulfate extended-release capsules treatment, reassess each patient’s risk of abuse, misuse, and addiction and frequently monitor for signs and symptoms of abuse, misuse, and addiction. Risks to Patients with Serious Cardiac Disease Sudden death has been reported in patients with structural cardiac abnormalities or other serious cardiac disease who are treated with CNS stimulants at the recommended ADHD dosages. Avoid dextroamphetamine sulfate extended-release capsule use in patients with known structural cardiac abnormalities, cardiomyopathy, serious cardiac arrhythmia, coronary artery disease, or other serious cardiac disease. Increased Blood Pressure and Heart Rate CNS stimulants cause an increase in blood pressure (mean increase about 2 to 4 mm Hg) and heart rate (mean increase about 3 to 6 bpm). Monitor all patients for potential tachycardia and hypertension. Psychiatric Adverse Reactions Exacerbation of Pre-Existing Psychosis CNS stimulants may exacerbate symptoms of behavior disturbance and thought disorder in patients with a preexisting psychotic disorder. Induction of a Manic Episode in Patients with Bipolar Disease CNS stimulants may induce a manic or mixed episode in patients. Prior to initiating treatment, screen patients for risk factors for developing a manic episode (e.g., comorbid or history of depressive symptoms or a family history of suicide, bipolar disorder, or depression). New Psychotic or Manic Symptoms CNS stimulants, at recommended doses, may cause psychotic or manic symptoms (e.g., hallucinations, delusional thinking, or mania) in patients without a prior history of psychotic illness or mania. In a pooled analysis of multiple short-term, placebo-controlled studies of CNS stimulants, psychotic or manic symptoms occurred in approximately 0.1% of CNS stimulant-treated patients, compared with 0% of placebo-treated patients. If such symptoms occur, consider discontinuing dextroamphetamine sulfate extended-release capsules. Long-Term Suppression of Growth in Pediatric Patients Dextroamphetamine sulfate extended-release capsules are not approved for use and are not recommended in pediatric patients below 6 years of age ( see PRECAUTIONS, Pediatric Use ). CNS stimulants have been associated with weight loss and slowing of growth rate in pediatric patients, including dextroamphetamine sulfate extended-release capsules. Closely monitor growth (weight and height) in dextroamphetamine sulfate extended-release capsules-treated pediatric patients treated with CNS stimulants. Pediatric patients who are not growing or gaining height or weight as expected may need to have their treatment interrupted ( see PRECAUTIONS, Pediatric Use ). Seizures There is some clinical evidence that stimulants may lower the convulsive threshold in patients with prior history of seizures, in patients with prior EEG abnormalities in absence of seizures, and, very rarely, in patients without a history of seizures and no prior EEG evidence of seizures. In the presence of seizures, the drug should be discontinued. Peripheral Vasculopathy, Including Raynaud’s Phenomenon Stimulants, including dextroamphetamine sulfate extended-release capsules, used to treat ADHD are associated with peripheral vasculopathy, including Raynaud’s phenomenon. Signs and symptoms are usually intermittent and mild; however, sequelae have included digital ulceration and/or soft tissue breakdown. Effects of peripheral vasculopathy, including Raynaud’s phenomenon, were observed in postmarketing reports and at therapeutic dosages in all age groups throughout the course of treatment. Signs and symptoms generally improve after dosage reduction or discontinuation of the CNS stimulant. Careful observation for digital changes is necessary during dextroamphetamine sulfate extended-release capsules treatment. Further clinical evaluation (e.g., rheumatology referral) may be appropriate for dextroamphetamine sulfate extended-release capsules-treated patients who develop signs or symptoms of peripheral vasculopathy. Serotonin Syndrome Serotonin syndrome, a potentially life-threatening reaction, may occur when amphetamines are used in combination with other drugs that affect the serotonergic neurotransmitter systems such as monoamine oxidase inhibitors (MAOIs), selective serotonin reuptake inhibitors (SSRIs), serotonin norepinephrine reuptake inhibitors (SNRIs), triptans, tricyclic antidepressants, fentanyl, lithium, tramadol, tryptophan, buspirone, and St. John’s Wort ( see Drug Interactions ). Amphetamines and amphetamine derivatives are known to be metabolized, to some degree, by cytochrome P450 2D6 (CYP2D6) and display minor inhibition of CYP2D6 metabolism ( see CLINICAL PHARMACOLOGY ). The potential for a pharmacokinetic interaction exists with the co-administration of CYP2D6 inhibitors which may increase the risk with increased exposure to dextroamphetamine sulfate extended-release capsules. In these situations, consider an alternative non-serotonergic drug or an alternative drug that does not inhibit CYP2D6 ( see Drug Interactions ). Serotonin syndrome symptoms may include mental status changes (e.g., agitation, hallucinations, delirium, and coma), autonomic instability (e.g., tachycardia, labile blood pressure, dizziness, diaphoresis, flushing, hyperthermia), neuromuscular symptoms (e.g., tremor, rigidity, myoclonus, hyperreflexia, incoordination), seizures, and/or gastrointestinal symptoms (e.g., nausea, vomiting, diarrhea). Concomitant use of dextroamphetamine sulfate extended-release capsules with MAOI drugs is contraindicated ( see CONTRAINDICATIONS ). Discontinue treatment with dextroamphetamine sulfate extended-release capsules and any concomitant serotonergic agents immediately if the above symptoms occur, and initiate supportive symptomatic treatment. If concomitant use of dextroamphetamine sulfate extended-release capsules with other serotonergic drugs or CYP2D6 inhibitors is clinically warranted, initiate dextroamphetamine sulfate extended-release capsules with lower doses, monitor patients for the emergence of serotonin syndrome during drug initiation or titration, and inform patients of the increased risk for serotonin syndrome. Motor and Verbal Tics, and Worsening of Tourette’s Syndrome CNS stimulants, including amphetamine sulfate, have been associated with the onset or exacerbation of motor and verbal tics. Worsening of Tourette’s syndrome has also been reported. Before initiating dextroamphetamine sulfate extended-release capsules, assess the family history and clinically evaluate patients for tics or Tourette’s syndrome. Regularly monitor patients for the emergence or worsening of tics or Tourette’s syndrome with dextroamphetamine sulfate extended-release capsules, and discontinue treatment if clinically appropriate.
Boxed Warning
ABUSE, MISUSE, AND ADDICTION Dextroamphetamine sulfate extended-release capsules have a high potential for abuse and misuse, which can lead to the development of a substance use disorder, including addiction. Misuse and abuse of CNS stimulants, including dextroamphetamine sulfate extended-release capsules, can result in overdose and death ( see OVERDOSAGE ), and this risk is increased with higher doses or unapproved methods of administration, such as snorting or injection. Before prescribing dextroamphetamine sulfate extended-release capsules, assess each patient’s risk for abuse, misuse, and addiction. Educate patients and their families about these risks, proper storage of the drug, and proper disposal of any unused drug. Throughout dextroamphetamine sulfate extended-release capsules treatment, reassess each patient’s risk of abuse, misuse, and addiction and frequently monitor for signs and symptoms of abuse, misuse, and addiction ( see WARNINGS and DRUG ABUSE AND DEPENDENCE ).
Contraindications
In patients known to be hypersensitive to amphetamine, or other components of dextroamphetamine 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 ). Patients 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 Drug Interactions ).
Adverse Reactions
Cardiovascular Palpitations, tachycardia, elevation of blood pressure. There have been isolated reports of cardiomyopathy associated with chronic amphetamine use. Central Nervous System Psychotic episodes at recommended doses (rare), overstimulation, restlessness, dizziness, insomnia, euphoria, dyskinesia, dysphoria, tremor, headache, exacerbation of motor and verbal tics and Tourette’s syndrome. Gastrointestinal Dryness of the mouth, unpleasant taste, diarrhea, constipation, intestinal ischemia, and other gastrointestinal disturbances. Anorexia and weight loss may occur as undesirable effects. Allergic Urticaria. Endocrine Impotence, changes in libido, frequent or prolonged erections. Musculoskeletal Rhabdomyolysis. Skin and Subcutaneous Tissue Disorders Alopecia. To report SUSPECTED ADVERSE REACTIONS, contact Mallinckrodt at 1-800-778-7898 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
Drug Interactions
Acidifying Agents Lower blood levels and efficacy of amphetamines. Increase dose based on clinical response. Examples of acidifying agents include gastrointestinal acidifying agents (e.g., guanethidine, reserpine, glutamic acid HCl, ascorbic acid) and urinary acidifying agents (e.g., ammonium chloride, sodium acid phosphate, methenamine salts). Adrenergic Blockers Adrenergic blockers are inhibited by amphetamines. Alkalinizing Agents Increase blood levels and potentiate the action of amphetamine. Co-administration of dextroamphetamine sulfate extended-release capsules and gastrointestinal alkalinizing agents should be avoided. Examples of alkalinizing agents include gastrointestinal alkalinizing agents (e.g., sodium bicarbonate) and urinary alkalinizing agents (e.g., acetazolamide, some thiazides). Tricyclic Antidepressants 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. Monitor frequently and adjust or use alternative therapy based on clinical response. Examples of tricyclic antidepressants include desipramine, Protriptyline. CYP2D6 Inhibitors The concomitant use of dextroamphetamine sulfate extended-release capsules and CYP2D6 inhibitors may increase the exposure of dextroamphetamine sulfate extended-release capsules compared to the use of the drug alone and increase the risk of serotonin syndrome. Initiate with lower doses and monitor patients for signs and symptoms of serotonin syndrome particularly during dextroamphetamine sulfate extended-release capsules initiation and after a dosage increase. If serotonin syndrome occurs, discontinue dextroamphetamine sulfate extended-release capsules and the CYP2D6 inhibitor ( see WARNINGS , OVERDOSAGE ). Examples of CYP2D6 Inhibitors include paroxetine and fluoxetine (also serotonergic drugs), quinidine, ritonavir. Serotonergic Drugs The concomitant use of dextroamphetamine sulfate extended-release capsules and serotonergic drugs increases the risk of serotonin syndrome. Initiate with lower doses and monitor patients for signs and symptoms of serotonin syndrome, particularly during dextroamphetamine sulfate extended-release capsules initiation or dosage increase. If serotonin syndrome occurs, discontinue dextroamphetamine sulfate extended-release capsules and the concomitant serotonergic drug(s) ( see WARNINGS and PRECAUTIONS ). Examples of serotonergic drugs include selective serotonin reuptake inhibitors (SSRI), serotonin norepinephrine reuptake inhibitors (SNRI), triptans, tricyclic antidepressants, fentanyl, lithium, tramadol, tryptophan, buspirone, St. John’s Wort. MAO Inhibitors 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. Do not administer dextroamphetamine sulfate extended-release capsules concomitantly or within 14 days after discontinuing MAOI ( see CONTRAINDICATIONS and WARNINGS ). Examples of MAOIs include selegiline, tranylcypromine, isocarboxazid, phenelzine, linezolid, methylene blue. Proton Pump Inhibitors Time to maximum concentration (T max ) of amphetamine is decreased compared to when administered alone. Monitor patients for changes in clinical effect and adjust therapy based on clinical response. An example of a proton pump inhibitor is omeprazole. Antihistamines Amphetamines may counteract the sedative effect of antihistamines. Antihypertensives Amphetamines may antagonize the hypotensive effects of antihypertensives. Chlorpromazine Chlorpromazine blocks dopamine and norepinephrine reuptake, thus inhibiting the central stimulant effects of amphetamines, and can be used to treat amphetamine poisoning. Ethosuximide Amphetamines may delay intestinal absorption of ethosuximide. Haloperidol Haloperidol blocks dopamine and norepinephrine reuptake, thus inhibiting the central stimulant effects of amphetamines. Lithium Carbonate The stimulatory effects of amphetamines may be inhibited by lithium carbonate. Meperidine Amphetamines potentiate the analgesic effect of meperidine. Methenamine Therapy Urinary excretion of amphetamines is increased, and efficacy is reduced, by acidifying agents used in methenamine therapy. Norepinephrine Amphetamines enhance the adrenergic effect of norepinephrine. Phenobarbital Amphetamines may delay intestinal absorption of phenobarbital; co-administration of phenobarbital may produce a synergistic anticonvulsant action. Phenytoin Amphetamines may delay intestinal absorption of phenytoin; co-administration of phenytoin may produce a synergistic anticonvulsant action. Propoxyphene In cases of propoxyphene overdosage, amphetamine CNS stimulation is potentiated and fatal convulsions can occur. Veratrum Alkaloids Amphetamines inhibit the hypotensive effect of veratrum alkaloids. 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. Carcinogenesis/Mutagenesis Mutagenicity studies and long-term studies in animals to determine the carcinogenic potential of dextroamphetamine sulfate extended-release capsules have not been performed.
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