Dexedrine (Dextroamphetamine): Uses, Dosage, Side Effects & Warnings

How Dexedrine works (mechanism, onset & duration)

extroamphetamine is a sympathomimetic CNS stimulant. It promotes the release (and to a lesser degree inhibition of reuptake) of dopamine and norepinephrine in key brain regions involved in attention, executive function, and arousal. 

Pharmacokinetic highlights (from FDA labeling):

• IR tabletsaverage Tmax ≈ 3 hours.
• ER (Spansule)peak concentrations around ~8 hours post‑dose; designed for gradual, prolonged release.
• Average plasma half‑life ≈ 12 hours (varies by individual factors, urinary pH, and dose).

Patient‑facing summaries often describe IR coverage as part‑day and ER as once‑daily coverage, though individual response varies and regimen is tailored by prescribers.

Forms & strengths: IR vs ER (Spansule)

• Immediate‑release tablets (generic dextroamphetamine)typically taken 1–3 times daily depending on clinical need and prescriber instructions.
• Dexedrine Spansule extended‑release capsulesdesigned for once‑daily use in appropriate patients, with both prompt and gradual release components.

Important: Specific marketed strengths and brand versions can change over time. For current label details, the Dexedrine Spansule labeling lists 5 mg, 10 mg, and 15 mg capsule strengths and provides NDCs; real‑world stock may differ by pharmacy and ongoing supply.

Side effects

Common effects can include decreased appetite, weight loss, insomnia, dry mouth, headache, increased heart rate, and nervousness.

Serious or urgent‑care warnings (seek medical attention or contact your clinician immediately if present):

• Cardiovascular: chest pain, fainting, shortness of breath; monitor BP/HR regularly.

• Psychiatric: new or worsening psychosis/mania, agitation, hallucinations.

• Serotonin syndrome when combined with serotonergic agents (confusion, agitation, fever, sweating, tremor).

• Peripheral vasculopathy (fingers/toes changes).

• Growth effects in pediatric patients (monitor height/weight over time).

Boxed & major warnings

• Abuse, misuse, and addictionDexedrine has a boxed warning. Misuse can lead to overdose and death, especially at high doses or via non‑prescribed routes (e.g., snorting/injecting). Clinicians should assess risk and monitor throughout treatment.
• Cardiac risksSudden death has occurred in people with serious heart problems; screen for cardiac disease and monitor blood pressure/heart rate.
• Psychiatric risksNew or worse behavior/thought problems, psychosis/mania can occur; evaluate personal/family psychiatric history.
• Contraindicated with MAOIs (or recent MAOI use).
• Tics/Tourette’sEvaluate for history of tics/Tourette’s; stimulants may exacerbate tics in some patients.

Drug interactions

• MAOIs: absolute contraindication within 14 days.

• Serotonergic agents (e.g., SSRIs/SNRIs, triptans): risk of serotonin syndrome; monitor if co‑used per prescriber.

• Agents that acidify or alkalinize urine may alter amphetamine excretion and effects; clinicians consider these when managing therapy.

Who should not use it / use with caution

Do not use if allergic to amphetamines or if currently on/recently used an MAOI. Use caution (and disclose to your prescriber) if you or your child have:

• Heart disease, structural abnormalities, or hypertension

• Psychiatric history, including psychosis, bipolar disorder, or family history of suicide or depression

• Seizure history

• Tics or Tourette’s (personal or family history)

• Pregnancy (risk not fully known) or breastfeeding (passes into milk)