Drug interactions
Dimenhydrinate + Doxylamine
Severity: Moderate
Dimenhydrinate and Doxylamine: 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 with sedative and anticholinergic properties. Using them together increases drowsiness, impaired psychomotor function and anticholinergic effects.
What this interaction means in plain words
Dimenhydrinate and Doxylamine 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; Doxylamine belongs to Respiratory.
Why it happens
Additive central H1-receptor blockade and muscarinic antagonism.
What to do
Avoid duplicate sedating antihistamines. Counsel against driving and monitor older patients for 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 Dimenhydrinate
Other interactions of Doxylamine
Frequently asked questions
Can I take Dimenhydrinate with Doxylamine?
MediHelp rates the interaction as moderate. Dimenhydrinate and Doxylamine 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 with sedative and anticholinergic properties. Using them together increases drowsiness, impaired psychomotor function and anticholinergic effects.
How serious is the interaction between Dimenhydrinate and Doxylamine?
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 duplicate sedating antihistamines. Counsel against driving and monitor older patients for confusion and urinary retention.
What other medicines interact with Dimenhydrinate?
MediHelp also lists interactions of Dimenhydrinate with, for example, Belladonna and opium, Brexanolone, Calcium / magnesium / potassium / sodium oxybates. The full list is on the Dimenhydrinate page.
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