Drug interactions
Fentanyl intranasal + Lidocaine
Severity: Minor
Fentanyl intranasal and Lidocaine: minor 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
Fentanyl is cleared by CYP3A4, and inhibitors can raise its concentrations and respiratory depression risk. Lidocaine is only a weak CYP3A4 substrate-inhibitor, so a clinically important effect is unlikely at usual doses.
What this interaction means in plain words
Fentanyl intranasal and Lidocaine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Weak CYP3A4 inhibition by lidocaine slightly reduces fentanyl clearance.
What to do
Monitor for sedation and respiratory depression as usual with fentanyl; no dose change is routinely required.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Lidocaine
- Bupivacaine liposome + Lidocaine Major
- Disopyramide + Lidocaine Major
- Ex vivo expanded autologous human corneal epithelial cells containing stem cells + Lidocaine Major
- Lidocaine + Nirmatrelvir / ritonavir Major
- Lidocaine + Ombitasvir / paritaprevir / ritonavir and dasabuvir Major
- Lidocaine + Pimozide Major
Frequently asked questions
Can I take Fentanyl intranasal with Lidocaine?
MediHelp rates the interaction as minor. Fentanyl intranasal and Lidocaine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Fentanyl is cleared by CYP3A4, and inhibitors can raise its concentrations and respiratory depression risk. Lidocaine is only a weak CYP3A4 substrate-inhibitor, so a clinically important effect is unlikely at usual doses.
How serious is the interaction between Fentanyl intranasal and Lidocaine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for sedation and respiratory depression as usual with fentanyl; no dose change is routinely required.
What other medicines interact with Lidocaine?
MediHelp also lists interactions of Lidocaine with, for example, Bupivacaine liposome, Disopyramide, Ex vivo expanded autologous human corneal epithelial cells containing stem cells. The full list is on the Lidocaine page.
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