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Look Up > Drugs > Benzphetamine
Benzphetamine
Pronunciation
U.S. Brand Names
Generic Available
Synonyms
Pharmacological Index
Use
Restrictions
Pregnancy Risk Factor
Contraindications
Adverse Reactions
Drug Interactions
Mechanism of Action
Usual Dosage
Dental Health: Local Anesthetic/Vasoconstrictor Precautions
Dental Health: Effects on Dental Treatment
Patient Information
Nursing Implications
Dosage Forms

Pronunciation
(benz FET a meen)

U.S. Brand Names
Didrex®

Generic Available

No


Synonyms
Benzphetamine Hydrochloride

Pharmacological Index

Anorexiant


Use

Short-term adjunct in exogenous obesity


Restrictions

C-III


Pregnancy Risk Factor

X


Contraindications

Known hypersensitivity or idiosyncrasy to sympathomimetic amines. Patients with advanced arteriosclerosis, symptomatic cardiovascular disease, moderate to severe hypertension (stage II or III), hyperthyroidism, glaucoma, agitated states, patients with a history of drug abuse, pregnancy, and during or within 14 days following MAO inhibitor therapy. Concurrent use with other anorectic agents; stimulant medications are contraindicated for use in children with attention deficit/hyperactivity disorders and concomitant Tourette's syndrome or tics.


Adverse Reactions

>10%:

Cardiovascular: Arrhythmia

Central nervous system: False feeling of well being, nervousness, restlessness, insomnia

1% to 10%:

Cardiovascular: Hypertension,

Central nervous system: Mood or mental changes, dizziness, lightheadedness, headache, xerostomia

Endocrine & metabolic: Changes in libido

Gastrointestinal: Diarrhea, nausea, vomiting, stomach cramps, constipation, anorexia, weight loss

Ocular: Blurred vision

Miscellaneous: Increased diaphoresis


Drug Interactions

CYP3A3/4 enzyme substrate


Mechanism of Action

Noncatechol sympathomimetic amines with pharmacologic actions similar to ephedrine; require breakdown by monoamine oxidase for inactivation; produce central nervous system and respiratory stimulation, a pressor response, mydriasis, bronchodilation, and contraction of the urinary sphincter; thought to have a direct effect on both alpha- and beta-receptor sites in the peripheral system, as well as release stores of norepinephrine in adrenergic nerve terminals; central nervous system action is thought to occur in the cerebral cortex and reticular-activating system; anorexigenic effect is probably secondary to the CNS-stimulating effect; the site of action is probably the hypothalamic feeding center


Usual Dosage

Adults: Oral: 25-50 mg 2-3 times/day, preferably twice daily (midmorning and midafternoon); maximum dose: 50 mg 3 times/day


Dental Health: Local Anesthetic/Vasoconstrictor Precautions

Use with caution since amphetamines have actions similar to epinephrine and norepinephrine


Dental Health: Effects on Dental Treatment

No effects or complications reported


Patient Information

Take during day to avoid insomnia; do not discontinue abruptly, may be addicting with prolonged use


Nursing Implications

Monitor CNS


Dosage Forms

Tablet, as hydrochloride: 25 mg, 50 mg


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