Drug interactions
Dexfenfluramine + Methamphetamine
Severity: Major
Dexfenfluramine and Methamphetamine: major interaction.
Last updated Sources: US FDA label
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
Both drugs increase monoamine activity, with dexfenfluramine being predominantly serotonergic. Combined use raises the risk of excessive sympathetic stimulation and serotonin toxicity. Dexfenfluramine has been withdrawn in many countries because of valvular heart disease and pulmonary hypertension.
What this interaction means in plain words
Dexfenfluramine and Methamphetamine 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
Additive release of serotonin and catecholamines with pharmacodynamic synergy.
What to do
Avoid the combination. If dexfenfluramine is encountered, monitor blood pressure, heart rate and signs of serotonin syndrome.
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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References
Other interactions of Methamphetamine
- Isocarboxazid + Methamphetamine Contraindicated
- Linezolid + Methamphetamine Contraindicated
- Methamphetamine + Phenelzine Contraindicated
- Methamphetamine + Procarbazine Contraindicated
- Methamphetamine + Rasagiline Contraindicated
- Methamphetamine + Safinamide Contraindicated
Frequently asked questions
Can I take Dexfenfluramine with Methamphetamine?
MediHelp rates the interaction as major. Dexfenfluramine and Methamphetamine 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. Both drugs increase monoamine activity, with dexfenfluramine being predominantly serotonergic. Combined use raises the risk of excessive sympathetic stimulation and serotonin toxicity. Dexfenfluramine has been withdrawn in many countries because of valvular heart disease and pulmonary hypertension.
How serious is the interaction between Dexfenfluramine and Methamphetamine?
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 the combination. If dexfenfluramine is encountered, monitor blood pressure, heart rate and signs of serotonin syndrome.
What other medicines interact with Methamphetamine?
MediHelp also lists interactions of Methamphetamine with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Methamphetamine page.
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