Drug interactions
Brompheniramine + Fentanyl transdermal
Severity: Moderate
Brompheniramine and Fentanyl transdermal: 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
Concurrent use of transdermal fentanyl and a sedating antihistamine increases the risk of excess sedation and respiratory depression. Anticholinergic effects may add to opioid-induced constipation and urinary retention.
What this interaction means in plain words
Brompheniramine and Fentanyl transdermal 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.
Why it happens
Additive CNS and respiratory depression from opioid agonism and H1 antagonism, plus additive antimuscarinic effects.
What to do
Monitor sedation and breathing, especially after dose changes, and use a non-sedating antihistamine if possible. Monitor bowel and bladder function.
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 Brompheniramine
Frequently asked questions
Can I take Brompheniramine with Fentanyl transdermal?
MediHelp rates the interaction as moderate. Brompheniramine and Fentanyl transdermal 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. Concurrent use of transdermal fentanyl and a sedating antihistamine increases the risk of excess sedation and respiratory depression. Anticholinergic effects may add to opioid-induced constipation and urinary retention.
How serious is the interaction between Brompheniramine and Fentanyl transdermal?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor sedation and breathing, especially after dose changes, and use a non-sedating antihistamine if possible. Monitor bowel and bladder function.
What other medicines interact with Brompheniramine?
MediHelp also lists interactions of Brompheniramine with, for example, Alfentanil, Belladonna and opium, Benzhydrocodone / acetaminophen. The full list is on the Brompheniramine page.
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