Drug interactions
Carbamazepine + Dexamethasone-neomycin-polymyxin
Severity: Moderate
Carbamazepine and Dexamethasone-neomycin-polymyxin: moderate 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
Carbamazepine induces CYP3A4 and lowers dexamethasone exposure, which may reduce its anti-inflammatory or replacement effect. Systemic exposure from topical use is low, so the effect is smaller there.
What this interaction means in plain words
Carbamazepine and Dexamethasone-neomycin-polymyxin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Carbamazepine belongs to Central Nervous System; Dexamethasone-neomycin-polymyxin belongs to Anti Bacterial.
Why it happens
CYP3A4 induction by carbamazepine accelerates dexamethasone clearance.
What to do
With systemic dexamethasone, monitor clinical response and raise the dose if needed. No change is usually needed for topical use.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Dexamethasone-neomycin-polymyxin
- Dexamethasone-neomycin-polymyxin + Ketorolac Major
- Dexamethasone-neomycin-polymyxin + Lapatinib Major
- Dexamethasone-neomycin-polymyxin + Levofloxacin Major
- Dexamethasone-neomycin-polymyxin + Mifepristone Major
- Dexamethasone-neomycin-polymyxin + Moxifloxacin Major
- Aldesleukin + Dexamethasone-neomycin-polymyxin Moderate
Other interactions of Carbamazepine
- Artemether / lumefantrine + Carbamazepine Contraindicated
- Cabotegravir + Carbamazepine Contraindicated
- Carbamazepine + Delamanid Contraindicated
- Carbamazepine + Dienogest / estradiol valerate Contraindicated
- Carbamazepine + Doravirine Contraindicated
- Carbamazepine + Elbasvir / grazoprevir Contraindicated
Frequently asked questions
Can I take Carbamazepine with Dexamethasone-neomycin-polymyxin?
MediHelp rates the interaction as moderate. Carbamazepine and Dexamethasone-neomycin-polymyxin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Carbamazepine induces CYP3A4 and lowers dexamethasone exposure, which may reduce its anti-inflammatory or replacement effect. Systemic exposure from topical use is low, so the effect is smaller there.
How serious is the interaction between Carbamazepine and Dexamethasone-neomycin-polymyxin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: With systemic dexamethasone, monitor clinical response and raise the dose if needed. No change is usually needed for topical use.
What other medicines interact with Dexamethasone-neomycin-polymyxin?
MediHelp also lists interactions of Dexamethasone-neomycin-polymyxin with, for example, Ketorolac, Lapatinib, Levofloxacin. The full list is on the Dexamethasone-neomycin-polymyxin page.
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