Drug Interaction Report

Doxylamine and Linezolid Injection: Interaction Details

Name: Doxylamine and Linezolid Injection Interaction
Creator: Dr. Brian Staiger, PharmD, BCPS

A pharmacist-reviewed analysis of the Doxylamine and Linezolid Injection interaction: the documented clinical effects, severity rating, onset, mechanism, and management considerations, with cited references throughout.

AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature

Doxylamine

Aldex AN Nocto Unisom Wal-Som (doxylamine) Zzzquil Ultra

Linezolid Injection

Zyvox Zyvox®

Medically reviewed by

Dr. Brian Staiger, PharmD, BCPS

Updated Aug 8, 2026

Editorial policy · Data sources

Interaction severity

Contraindicated

These should generally not be used together.

Minor

Moderate

Major

Contraindicated

How we grade severity & evidence

Severity levels

Contraindicated: These should generally not be used together.
Major: Potentially serious — often needs a change or close monitoring.
Moderate: Can be significant — usually manageable with monitoring.
Minor: Usually limited clinical impact.

Evidence grades

Established: Well documented — supported by controlled studies or strong clinical data.
Probable: Good supporting evidence, though not definitively proven.
Suspected: Some evidence suggests this interaction, but it is not well established.
Possible: Limited or conflicting evidence; the interaction may occur.
Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.

Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.

Of 24 documented Doxylamine interactions, 1 is rated contraindicated — including this one.

Worried about symptoms right now? Contact your pharmacist or prescriber, or call Poison Control at 1-800-222-1222 (US). Call 911 for an emergency.

Onset

unspecified

Evidence

theoretical

Severity

Contraindicated

What happens

Prolonged and intensified anticholinergic effects (eg, severe dry mouth, constipation, decreased urination or sweating)

Interaction Deep Dive

Concomitant use of doxylamine with an MAOI may prolong and intensify the anticholinergic effects of doxylamine and is contraindicated¹².

Why it happens (mechanism)

Unknown

Common questions

Can I take Doxylamine and Linezolid Injection together?

Prolonged and intensified anticholinergic effects (eg, severe dry mouth, constipation, decreased urination or sweating) Always confirm with your pharmacist or prescriber before making any change.

How serious is the Doxylamine and Linezolid Injection interaction?

It is rated contraindicated. These should generally not be used together.

How quickly could this interaction happen?

The documented onset is "unspecified". The timing of this interaction is not well characterized.

How strong is the evidence for this interaction?

The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.

Questions for your pharmacist

Does my dose of Doxylamine or Linezolid Injection need adjusting while I take them together?
What symptoms should prompt me to call you or my prescriber right away?
Does the timing of my doses matter for this combination?
Is there a safer alternative to one of these medications for me?

References (2)

Product Information: BONJESTA(R) oral extended-release tablets, doxylamine succinate pyridoxine HCl oral extended-release tablets. Duchesnay USA, Inc (per FDA), Bryn Mawr, PA, 2016. DailyMed
Product Information: DICLEGIS(R) oral delayed-release tablets, doxylamine succinate pyridoxine HCl oral delayed-release tablets. Duchesnay Inc. (per manufacturer), Bryn Mawr, PA, 2013. DailyMed

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Doxylamine

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Linezolid Injection

Keep reading about Linezolid Injection

All Linezolid Injection interactions (212) Linezolid Injection drug information

Also serious with: Tramadol Tranylcypromine Trazodone Trimipramine

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About our interaction database: depth, not breadth

HelloPharmacist doesn't license one of the big commercial interaction databases, so what you'll find here is not a complete list of every known drug interaction. Instead, each entry is researched, analyzed, and written up individually — documented from the published literature, reviewed by a pharmacist, and cited so you can check every source yourself.

If a combination isn't listed here, it means we haven't documented it yet — never that it's safe. For screening a full medication list, we recommend pairing this site with a comprehensive tool like the Drugs.com Interaction Checker and, most importantly, a review by your own pharmacist. For a deep, plain-English, fully sourced explanation of a specific documented interaction — that's exactly what we built this for.

This information is for education, not a substitute for professional medical advice. Do not start, stop, or change any medication without talking to your pharmacist or prescriber.