Drug interactions
Doxylamine + Protriptyline
Severity: Moderate
Doxylamine and Protriptyline: 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
Protriptyline is a tricyclic antidepressant with strong anticholinergic effects, and doxylamine is also anticholinergic. Together they may cause dry mouth, constipation, urinary retention, confusion and sedation, with possible tachycardia.
What this interaction means in plain words
Doxylamine and Protriptyline 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 in elderly patients and those with glaucoma or urinary retention. Monitor for anticholinergic toxicity and sedation.
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 Protriptyline?
MediHelp rates the interaction as moderate. Doxylamine and Protriptyline 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. Protriptyline is a tricyclic antidepressant with strong anticholinergic effects, and doxylamine is also anticholinergic. Together they may cause dry mouth, constipation, urinary retention, confusion and sedation, with possible tachycardia.
How serious is the interaction between Doxylamine and Protriptyline?
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 in elderly patients and those with glaucoma or urinary retention. Monitor for anticholinergic toxicity and sedation.
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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