Drug interactions
Carbinoxamine + Dimenhydrinate
Severity: Moderate
Carbinoxamine and Dimenhydrinate: 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, so taking them together duplicates therapy and increases sedation and anticholinergic effects. This can cause drowsiness, dry mouth, urinary retention and confusion, especially in older adults.
What this interaction means in plain words
Carbinoxamine and Dimenhydrinate 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.
Carbinoxamine belongs to Respiratory; Dimenhydrinate belongs to Respiratory.
Why it happens
Additive H1 antagonism with additive antimuscarinic and CNS depressant effects.
What to do
Avoid using two sedating antihistamines together; use one agent only. Monitor for sedation and anticholinergic effects if overlap is unavoidable.
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 Carbinoxamine
- Alprazolam + Carbinoxamine Moderate
- Amisulpride + Carbinoxamine Moderate
- Amitriptyline + Carbinoxamine Moderate
- Amobarbital + Carbinoxamine Moderate
- Asenapine + Carbinoxamine Moderate
- Azelastine-fluticasone + Carbinoxamine Moderate
Frequently asked questions
Can I take Carbinoxamine with Dimenhydrinate?
MediHelp rates the interaction as moderate. Carbinoxamine and Dimenhydrinate 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, so taking them together duplicates therapy and increases sedation and anticholinergic effects. This can cause drowsiness, dry mouth, urinary retention and confusion, especially in older adults.
How serious is the interaction between Carbinoxamine and Dimenhydrinate?
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 two sedating antihistamines together; use one agent only. Monitor for sedation and anticholinergic effects if overlap is unavoidable.
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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