Drug interactions
Belladonna and opium + Dimenhydrinate
Severity: Major
Belladonna and opium and Dimenhydrinate: major 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
The opium component adds opioid sedation and respiratory depression to dimenhydrinate's sedative effect. Belladonna alkaloids and dimenhydrinate are both anticholinergic, raising the risk of dry mouth, urinary retention, constipation and confusion.
What this interaction means in plain words
Belladonna and opium and Dimenhydrinate 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
Additive CNS and respiratory depression plus additive antimuscarinic effects.
What to do
Avoid the combination where possible; otherwise use the lowest doses and monitor sedation, breathing and anticholinergic symptoms. Be especially careful in older patients and those with respiratory disease.
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?
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Other interactions of Dimenhydrinate
Frequently asked questions
Can I take Belladonna and opium with Dimenhydrinate?
MediHelp rates the interaction as major. Belladonna and opium and Dimenhydrinate 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. The opium component adds opioid sedation and respiratory depression to dimenhydrinate's sedative effect. Belladonna alkaloids and dimenhydrinate are both anticholinergic, raising the risk of dry mouth, urinary retention, constipation and confusion.
How serious is the interaction between Belladonna and opium and Dimenhydrinate?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination where possible; otherwise use the lowest doses and monitor sedation, breathing and anticholinergic symptoms. Be especially careful in older patients and those with respiratory disease.
What other medicines interact with Dimenhydrinate?
MediHelp also lists interactions of Dimenhydrinate with, for example, Brexanolone, Calcium / magnesium / potassium / sodium oxybates, Dextromoramide. The full list is on the Dimenhydrinate page.
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