Drug interactions
Doxylamine + Triprolidine
Severity: Moderate
Doxylamine and Triprolidine: 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 are sedating first-generation antihistamines, and doxylamine is common in OTC sleep aids. Combining them duplicates therapy and increases drowsiness and anticholinergic effects, with next-day impairment and confusion in older adults.
What this interaction means in plain words
Doxylamine and Triprolidine 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.
Doxylamine belongs to Respiratory; Triprolidine belongs to Respiratory.
Why it happens
Duplicate H1-receptor blockade with additive CNS depression and antimuscarinic effects.
What to do
Avoid using both and check OTC sleep and cold products for duplicates. Warn about residual morning sedation if used.
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 Triprolidine
Other interactions of Doxylamine
Frequently asked questions
Can I take Doxylamine with Triprolidine?
MediHelp rates the interaction as moderate. Doxylamine and Triprolidine 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 are sedating first-generation antihistamines, and doxylamine is common in OTC sleep aids. Combining them duplicates therapy and increases drowsiness and anticholinergic effects, with next-day impairment and confusion in older adults.
How serious is the interaction between Doxylamine and Triprolidine?
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 using both and check OTC sleep and cold products for duplicates. Warn about residual morning sedation if used.
What other medicines interact with Triprolidine?
MediHelp also lists interactions of Triprolidine with, for example, Belladonna and opium, Benzhydrocodone / acetaminophen, Brexanolone. The full list is on the Triprolidine page.
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