Drug interactions
Diphenhydramine + Triprolidine
Severity: Moderate
Diphenhydramine 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 first-generation antihistamines, and diphenhydramine is also found in many OTC sleep and cold products. Using both increases sedation and anticholinergic effects, with a higher risk of confusion, urinary retention and falls in older adults.
What this interaction means in plain words
Diphenhydramine 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.
Diphenhydramine 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 concurrent use and check OTC products for duplicate antihistamines. Keep only one agent at the lowest effective dose.
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 Diphenhydramine
Frequently asked questions
Can I take Diphenhydramine with Triprolidine?
MediHelp rates the interaction as moderate. Diphenhydramine 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 first-generation antihistamines, and diphenhydramine is also found in many OTC sleep and cold products. Using both increases sedation and anticholinergic effects, with a higher risk of confusion, urinary retention and falls in older adults.
How serious is the interaction between Diphenhydramine 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 concurrent use and check OTC products for duplicate antihistamines. Keep only one agent at the lowest effective dose.
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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