Dextroamphetamine Saccharate, Amphetamine Aspartate Monohydrate, Dextroamphetamine Sulfate, and Amphetamine Sulfate (Page 4 of 10)

6.2 Adverse Reactions Associated with the Use of Amphetamine, dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules, or dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate tablets

The following adverse reactions have been identified during post-approval use of amphetamine, dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules, or dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate tablets. 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.


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, tics, aggression, anger, logorrhea, dermatillomania, paresthesia (including formication), and bruxism.
Eye Disorders
Vision blurred, mydriasis.
Gastrointestinal
Unpleasant taste, constipation, other gastrointestinal disturbances.
Allergic
Urticaria, rash, hypersensitivity reactions including angioedema and anaphylaxis. Serious skin rashes, including Stevens-Johnson Syndrome and toxic epidermal necrolysis have been reported.
Endocrine
Impotence, changes in libido, frequent or prolonged erections.
Skin
Alopecia.
Vascular Disorders
Raynaud’s phenomenon.
Musculoskeletal and Connective Tissue Disorders Rhabdomyolysis

7 DRUG INTERACTIONS

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)] .
Examples selegiline, tranylcypromine, isocarboxazid, phenelzine, linezolid, methylene blue
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 (5.6) ].
Examples selective serotonin reuptake inhibitors (SSRI), serotonin norepinephrine reuptake inhibitors (SNRI), triptans, tricyclic antidepressants, fentanyl, lithium, tramadol, tryptophan, buspirone, St. John’s Wort
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 (5.6) and Overdosage (10)].
Examples paroxetine and fluoxetine (also serotonergic drugs), quinidine, ritonavir
Alkalinizing Ag ents
Clinical Impact Increase blood levels and potentiate the action of amphetamine.
Intervention Co-administration of dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate and amphetamine sulfate extended-release capsules and gastrointestinal or urinary alkalinizing agents should be avoided.
Examples Gastrointestinal alkalinizing agents (e.g., sodium bicarbonate). Urinary alkalinizing agents (e.g. acetazolamide, some thiazides).
Ac idifying Ag ents
Clinical Impact Lower blood levels and efficacy of amphetamines.
Intervention Increase dose based on clinical response.
Examples Gastrointestinal acidifying agents (e.g., guanethidine, reserpine, glutamic acid HCl, ascorbic acid). Urinary acidifying agents (e.g., ammonium chloride, sodium acid phosphate, methenamine salts).
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.
Examples desipramine, protriptyline
Pro to n 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.
Examples Omeprazole

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