Drug Interaction Report

Halazepam and Levodopa Oral Inhalation: Interaction Details

A pharmacist-reviewed analysis of the Halazepam and Levodopa Oral Inhalation 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

Halazepam

No brand names on record
+

Levodopa Oral Inhalation

Inbrija Inbrija®
Dr. Brian Staiger, PharmD, BCPS
Medically reviewed by
Dr. Brian Staiger, PharmD, BCPS
Updated Aug 8, 2026
Editorial policy · Data sources
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Interaction severity
Major
Potentially serious — often needs a change or close monitoring.
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 22 documented Halazepam interactions, 21 are rated major — 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
Major

What happens

An increased risk of CNS depression

Interaction Deep Dive

Coadministration of foscarbidopa/foslevodopa and CNS depressants may increase risk of CNS depression. Exert caution when coadministered1.

Why it happens (mechanism)

Additive CNS depression

Literature reports

2 reports — tap to read

a) Melperone may antagonize the anti-parkinsonian effects of levodopa 2.

b) Concurrent use of zotepine and levodopa may result in a decrease of levodopa effectiveness due to the dopaminergic antagonistic properties of zotepine 3.

Common questions

Can I take Halazepam and Levodopa Oral Inhalation together?

An increased risk of CNS depression Always confirm with your pharmacist or prescriber before making any change.

How serious is the Halazepam and Levodopa Oral Inhalation interaction?

It is rated major. Potentially serious — often needs a change or close monitoring.

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 Halazepam or Levodopa Oral Inhalation 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 (3)

  1. Product Information: VYALEV(TM) subcutaneous injection, foscarbidopa and foslevodopa subcutaneous injection. AbbVie Inc (per FDA), North Chicago, IL, 2024. DailyMed
  2. Product Information: Eunerpan(R), Melperonhydrochlorid. Nordmark Arzneimittel GmbH, Uetersen, 1991.
  3. Product Information: Nipolept(R), zotepine. Klinge Pharma GmbH, Munich, Germany, 1994.
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Halazepam

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All Halazepam interactions (22)
Also serious with: Esketamine Nasal Spray Nalbuphine Injection Fentanyl Transdermal Patch Metoclopramide Injection
Levodopa Oral Inhalation

Keep reading about Levodopa Oral Inhalation

All Levodopa Oral Inhalation interactions (208) Levodopa Oral Inhalation drug information
Also serious with: Linezolid Methylene Blue Moclobemide Nialamide
Beyond drug–drug

These medications also interact with supplements

Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:

Halazepam + Activated Charcoal Grapefruit Adrue Ashwagandha Coffee Charcoal European Mandrake Glucomannan Guar Gum + 17 more

major · moderate · minor — check everything you take with our drug–supplement interaction checker.

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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.