Drug interactions
Methamphetamine + Phendimetrazine
Severity: Major
Methamphetamine and Phendimetrazine: 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
Both drugs are sympathomimetic stimulants, so combining them produces additive adrenergic effects such as hypertension, tachycardia, insomnia, agitation and possible arrhythmia. The risk of abuse and cardiovascular toxicity is also increased.
What this interaction means in plain words
Methamphetamine and Phendimetrazine 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 norepinephrine and dopamine from nerve terminals, producing summed sympathomimetic effects.
What to do
Avoid concurrent use where possible. If it cannot be avoided, monitor blood pressure, heart rate and cardiac symptoms and use the lowest effective doses.
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 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 Methamphetamine with Phendimetrazine?
MediHelp rates the interaction as major. Methamphetamine and Phendimetrazine 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 are sympathomimetic stimulants, so combining them produces additive adrenergic effects such as hypertension, tachycardia, insomnia, agitation and possible arrhythmia. The risk of abuse and cardiovascular toxicity is also increased.
How serious is the interaction between Methamphetamine and Phendimetrazine?
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 concurrent use where possible. If it cannot be avoided, monitor blood pressure, heart rate and cardiac symptoms and use the lowest effective doses.
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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