Drug interactions
Dimenhydrinate + Orphenadrin
Severity: Moderate
Dimenhydrinate and Orphenadrin: 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
Both drugs have sedating and anticholinergic properties, so taking them together can increase drowsiness, confusion and impaired psychomotor performance. Dry mouth, urinary retention and blurred vision may also be amplified, particularly in older adults.
What this interaction means in plain words
Dimenhydrinate and Orphenadrin 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.
Dimenhydrinate belongs to Respiratory; Orphenadrin belongs to Musculoskeletal.
Why it happens
Additive central H1-antagonist and antimuscarinic effects leading to CNS depression and anticholinergic burden.
What to do
Avoid combining where possible, especially in older patients; if used together, start with the lowest doses and counsel about driving and machinery. Monitor for excessive sedation, confusion and urinary retention.
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 Orphenadrin
Other interactions of Dimenhydrinate
Frequently asked questions
Can I take Dimenhydrinate with Orphenadrin?
MediHelp rates the interaction as moderate. Dimenhydrinate and Orphenadrin 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. Both drugs have sedating and anticholinergic properties, so taking them together can increase drowsiness, confusion and impaired psychomotor performance. Dry mouth, urinary retention and blurred vision may also be amplified, particularly in older adults.
How serious is the interaction between Dimenhydrinate and Orphenadrin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining where possible, especially in older patients; if used together, start with the lowest doses and counsel about driving and machinery. Monitor for excessive sedation, confusion and urinary retention.
What other medicines interact with Orphenadrin?
MediHelp also lists interactions of Orphenadrin with, for example, Alfentanil, Amobarbital, Benzhydrocodone / acetaminophen. The full list is on the Orphenadrin page.
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