Drug interactions
Dexamethasone-tobramycin + Rifampin
Severity: Major
Dexamethasone-tobramycin and Rifampin: major interaction.
Last updated Sources: US FDA label
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
Rifampin is a potent CYP3A4 inducer and markedly lowers dexamethasone exposure. This can cause loss of anti-inflammatory or replacement effect with systemic dexamethasone.
What this interaction means in plain words
Dexamethasone-tobramycin and Rifampin 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
Rifampin induces CYP3A4 and other enzymes, accelerating dexamethasone clearance.
What to do
Monitor clinical response and increase the dexamethasone dose if needed, or choose an alternative. Reassess the dose when rifampin is stopped.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Dexamethasone-tobramycin and Rifampin, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
References
Other interactions of Dexamethasone-tobramycin
Frequently asked questions
Can I take Dexamethasone-tobramycin with Rifampin?
MediHelp rates the interaction as major. Dexamethasone-tobramycin and Rifampin 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. Rifampin is a potent CYP3A4 inducer and markedly lowers dexamethasone exposure. This can cause loss of anti-inflammatory or replacement effect with systemic dexamethasone.
How serious is the interaction between Dexamethasone-tobramycin and Rifampin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor clinical response and increase the dexamethasone dose if needed, or choose an alternative. Reassess the dose when rifampin is stopped.
What other medicines interact with Dexamethasone-tobramycin?
MediHelp also lists interactions of Dexamethasone-tobramycin with, for example, Capreomycin, Carboplatin, Ciprofloxacin. The full list is on the Dexamethasone-tobramycin page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
