Drug interactions
Linezolid + Phenylephrine po
Severity: Major
Linezolid and Phenylephrine po: 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
Oral phenylephrine is a sympathomimetic and linezolid may potentiate its pressor effect, causing significant hypertension. Linezolid labeling advises caution with adrenergic agents.
What this interaction means in plain words
Linezolid and Phenylephrine po 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
MAO inhibition reduces catecholamine and phenylephrine metabolism, enhancing pressor response.
What to do
Avoid oral phenylephrine decongestants during linezolid therapy. If used, monitor blood pressure and use a non-sympathomimetic alternative.
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 Linezolid
- Amoxapine + Linezolid Contraindicated
- Atomoxetine + Linezolid Contraindicated
- Benzphetamine + Linezolid Contraindicated
- Brimonidine + Linezolid Contraindicated
- Bupropion-naltrexone + Linezolid Contraindicated
- Bupropion + Linezolid Contraindicated
Frequently asked questions
Can I take Linezolid with Phenylephrine po?
MediHelp rates the interaction as major. Linezolid and Phenylephrine po 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. Oral phenylephrine is a sympathomimetic and linezolid may potentiate its pressor effect, causing significant hypertension. Linezolid labeling advises caution with adrenergic agents.
How serious is the interaction between Linezolid and Phenylephrine po?
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 oral phenylephrine decongestants during linezolid therapy. If used, monitor blood pressure and use a non-sympathomimetic alternative.
What other medicines interact with Linezolid?
MediHelp also lists interactions of Linezolid with, for example, Amoxapine, Atomoxetine, Benzphetamine. The full list is on the Linezolid page.
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