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Lisdexamfetamine Facts

Stimulant; Substituted amphetamine; Dopamine releasing agent

Description

Lisdexamfetamine (lisdexamfetamine dimesylate) — Vyvanse, Elvanse — is a synthetic stimulant of the amphetamine class. It floods synapses with dopamine and norepinephrine, driving the sustained attention, motivation, and arousal that define the stimulant experience.[1]

Subjective effects include sustained attention, increased motivation, appetite suppression, mild mood elevation, and psychomotor activation. The experience is defined by a gradual onset and long plateau — a quiet cognitive sharpening that builds without a rush and holds steady for most of the waking day.

LDX produces psychological dependence with chronic use; cardiovascular stress — raised heart rate and blood pressure — is the primary physical danger for those with pre-existing heart conditions.[2] The prodrug design blunts the rapid dopamine spike that drives compulsive redosing, reducing but not eliminating abuse liability.[3]

Dose and durationby route · individual sensitivity varies

Oral(mg)
Threshold< 10 mgLight20 – 30 mgCommon30 – 50 mgStrong50 – 70 mgHeavy90+ mg

Starts in 30 – 90 minLasts 10 – 14 hoursAfter-effects 2 – 6 hours

Body and dependence

Acute toxicity
Low
Chronic toxicity
Moderate
Physical dependence
Low
Psychological dependence
Moderate
Withdrawal
Mild
Compulsive redosing
Low

Tolerance

Builds
Moderate
Fully resets after
14 days
Carries over to
dextroamphetamine; amphetamine; methamphetamine; methylphenidate

Effectslikely at a common dose

Perception
none likely · 8 possible
Body
Stimulation; Appetite suppression; Pupil dilation; Wakefulness; +22 possible, including Vasoconstriction, Insomnia, Dehydration sensation
Thinking
none likely · 20 possible, including Compulsive redosing urge, Thought loops
Feeling
none likely · 8 possible, including Anxiety, Depression, Paranoia
Self
none likely · 9 possible, including Craving, Ego inflation, Compulsive repetitive behavior
Time
none likely · 2 possible
Awareness
none likely · 1 possible

Who shouldn't take it

Absolute
Structural cardiac abnormalities; Moderate-to-severe hypertension; Agitated states; Hyperthyroidism; Hypersensitivity to amphetamine products; MAOI use (current or within 14 days); Glaucoma
Relative
Tic disorders; Seizure disorders; Bipolar disorder; Psychotic disorders; Pregnancy

Combinations61 recorded

Lethal (2)
MAOIs; Tramadol
Dangerous (33)
Anticholinergics; Atypical antipsychotics; Caffeine; Dopamine agonists; Ephedrine, Pseudoephedrine; Local anesthetics; MDMA, Amphetamines; MDMA, MDA; NDRIs (Wellbutrin); NRIs; Opioids; Psychedelics; SNRIs; SSRIs; Stimulants; 5-HTP, Tryptophan; Alpha-2 adrenergic receptor antagonist; Antihistamines; Antipsychotics; Buspirone; Clonidine, Guanfacine; DXM; GHB, Baclofen; GHB, GBL; and 9 more, see full page
Caution (23)
See full page: psychedex.org/substances/lisdexamfetamine
Not graded (3)
Not listed never means safe.

Seek help immediately if

  • Chest pain; racing, pounding, or irregular heartbeat
  • Very high body temperature; heavy sweating; hot, flushed skin
  • Severe agitation, paranoia, panic, or confusion
  • Severe headache; muscle rigidity or twitching
  • Seizures
  • Signs of stroke — face drooping, one-sided weakness, slurred speech
  • Difficulty breathing; collapse or unconsciousness

What to do

  1. Call emergency services for chest pain, overheating, seizure, or unresponsiveness
  2. Move them to a cool, quiet place and reduce stimulation
  3. Cool the body — remove excess clothing, apply cool damp cloths, fan them
  4. Keep them calm; reassure — panic worsens the cardiovascular strain
  5. If seizing, protect from injury (don't restrain); recovery position afterward
  6. Monitor breathing and be ready to give rescue breaths / CPR

Most stimulant overdoses settle with cooling, a calm environment, and time. The medical danger is hyperthermia, cardiac events (arrhythmia, heart attack, stroke), and seizures — get help immediately if any appear.

988 Suicide & Crisis LifelineFireside Project: 62-FIRESIDE

Version r1 · Not medical advice

References

  1. [1]
    ^Quintero J, Gutiérrez-Casares JR, Álamo C (2022) Molecular Characterisation of the Mechanism of Action of Stimulant Drugs Lisdexamfetamine and Methylphenidate on ADHD Neurobiology: A Review — Neurology and Therapy doi:10.1007/s40120-022-00392-2
  2. [2]
    ^FDA / Takeda Pharmaceuticals (2023) Vyvanse (lisdexamfetamine) Pharmacokinetic Data — FDA Prescribing Information / Daily MED Link
  3. [3]
    ^Jasinski DR, Krishnan S (2009) Human pharmacology of intravenous lisdexamfetamine dimesylate: abuse liability in adult stimulant abusers — Journal of psychopharmacology doi:10.1177/0269881108093841
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