Drug interactions
Dextroamphetamine transdermal + Lisdexamfetamine
Severity: Major
Dextroamphetamine transdermal and Lisdexamfetamine: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Lisdexamfetamine is a prodrug of dextroamphetamine, so combining it with transdermal dextroamphetamine duplicates therapy and causes excessive amphetamine exposure. This raises the risk of cardiovascular toxicity, agitation and serotonin syndrome.
What this interaction means in plain words
Dextroamphetamine transdermal and Lisdexamfetamine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Duplicate amphetamine exposure producing additive sympathomimetic and serotonergic effects.
What to do
Avoid using both products together and use a single amphetamine agent. If overlap occurs, monitor blood pressure, heart rate and signs of serotonin toxicity.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Lisdexamfetamine
- Isocarboxazid + Lisdexamfetamine Contraindicated
- Linezolid + Lisdexamfetamine Contraindicated
- Lisdexamfetamine + Phenelzine Contraindicated
- Lisdexamfetamine + Procarbazine Contraindicated
- Lisdexamfetamine + Rasagiline Contraindicated
- Lisdexamfetamine + Safinamide Contraindicated
Frequently asked questions
Can I take Dextroamphetamine transdermal with Lisdexamfetamine?
MediHelp rates the interaction as major. Dextroamphetamine transdermal and Lisdexamfetamine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Lisdexamfetamine is a prodrug of dextroamphetamine, so combining it with transdermal dextroamphetamine duplicates therapy and causes excessive amphetamine exposure. This raises the risk of cardiovascular toxicity, agitation and serotonin syndrome.
How serious is the interaction between Dextroamphetamine transdermal and Lisdexamfetamine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid using both products together and use a single amphetamine agent. If overlap occurs, monitor blood pressure, heart rate and signs of serotonin toxicity.
What other medicines interact with Lisdexamfetamine?
MediHelp also lists interactions of Lisdexamfetamine with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Lisdexamfetamine page.
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