Drug interactions
Doxylamine + Orphenadrine
Severity: Moderate
Doxylamine and Orphenadrine: 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 anticholinergic and sedative properties. Combined use can cause marked drowsiness, confusion, dry mouth, urinary retention and tachycardia, especially in the elderly.
What this interaction means in plain words
Doxylamine and Orphenadrine 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 anticholinergic effects and CNS depression.
What to do
Avoid concurrent use in older adults. Otherwise monitor for sedation and anticholinergic toxicity and reduce doses if needed.
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 Doxylamine
Frequently asked questions
Can I take Doxylamine with Orphenadrine?
MediHelp rates the interaction as moderate. Doxylamine and Orphenadrine 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 anticholinergic and sedative properties. Combined use can cause marked drowsiness, confusion, dry mouth, urinary retention and tachycardia, especially in the elderly.
How serious is the interaction between Doxylamine and Orphenadrine?
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 concurrent use in older adults. Otherwise monitor for sedation and anticholinergic toxicity and reduce doses if needed.
What other medicines interact with Doxylamine?
MediHelp also lists interactions of Doxylamine with, for example, Belladonna and opium, Benzhydrocodone / acetaminophen, Brexanolone. The full list is on the Doxylamine page.
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