Drug Interaction Report

Dihydrocodeine and Dexamethasone Ophthalmic: Interaction Details

A pharmacist-reviewed analysis of the Dihydrocodeine and Dexamethasone Ophthalmic 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

Dihydrocodeine

No brand names on record
+

Dexamethasone Ophthalmic

Dexacidin® (as a combination product containing Dexamethasone, Neomycin, Polymyxin B) Dexair Dexasporin® (as a combination product containing Dexamethasone, Neomycin, Polymyxin B) Maxidex® Maxitrol® (as a combination product containing Dexamethasone, Neomycin, Polymyxin B) Neodecadron® (as a combination product containing Dexamethasone, Neomycin) TobraDex® (as a combination product containing Dexamethasone, Tobramycin)
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 54 documented Dihydrocodeine interactions, 51 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

Reduced dihydrocodeine exposure

Interaction Deep Dive

Concomitant use of dihydrocodeine with a CYP3A4 inducer may reduce plasma concentrations of the parent drug (codeine) and the active metabolite (morphine), and may result in reduced opioid efficacy, and in some patients, signs or symptoms of opioid withdrawal. If coadministration is necessary, closely monitor for decreased efficacy or signs of opioid withdrawal syndrome and consider increasing dihydrocodeine dosage as necessary. When discontinuing a concurrent CYP3A4 inducer, consider reducing dihydrocodeine dosage and closely monitor for signs of respiratory depression or sedation12.

Why it happens (mechanism)

Induction of CYP3A4-mediated dihydrocodeine metabolism

Common questions

Can I take Dihydrocodeine and Dexamethasone Ophthalmic together?

Reduced dihydrocodeine exposure Always confirm with your pharmacist or prescriber before making any change.

How serious is the Dihydrocodeine and Dexamethasone Ophthalmic 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 Dihydrocodeine or Dexamethasone Ophthalmic 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)

  1. Product Information: TREZIX(TM) oral capsules, acetaminophen caffeine dihydrocodeine bitartrate oral capsules. WraSer Pharmaceuticals (per DailyMed), Ridgeland, MS, 2016. DailyMed
  2. Product Information: SYNALGOS(R)-DC oral capsules, aspirin, caffeine, dihydrocodeine bitartrate oral capsules. Sun Pharmaceuticals Industries Inc (per FDA), Cranbury, NJ, 2023. DailyMed
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Dihydrocodeine

Keep reading about Dihydrocodeine

All Dihydrocodeine interactions (54)
Also serious with: Linezolid Injection Clopidogrel Palonosetron Injection Cyclosporine Ophthalmic
Dexamethasone Ophthalmic

Keep reading about Dexamethasone Ophthalmic

All Dexamethasone Ophthalmic interactions (308) Dexamethasone Ophthalmic drug information
Also serious with: Desmopressin Ensitrelvir Mifepristone Zoliflodacin

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