Drug interactions
Doxylamine + Risperidone
Severity: Moderate
Doxylamine and Risperidone: 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
Doxylamine is a strongly sedating antihistamine, and combined use with risperidone can cause marked drowsiness and impaired alertness. Additive anticholinergic effects may also lead to confusion and constipation, particularly in older adults.
What this interaction means in plain words
Doxylamine and Risperidone 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; Risperidone belongs to Central Nervous System.
Why it happens
Additive CNS depression and anticholinergic effects from H1 and muscarinic blockade.
What to do
Advise avoiding driving, alcohol and other sedatives. Consider non-pharmacological sleep measures or a non-sedating alternative.
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 Risperidone
- Ibutilide + Risperidone Contraindicated
- Risperidone + Vandetanib Contraindicated
- Adagrasib + Risperidone Major
- Amiodarone + Risperidone Major
- Amisulpride + Risperidone Major
- Amoxapine + Risperidone Major
Other interactions of Doxylamine
Frequently asked questions
Can I take Doxylamine with Risperidone?
MediHelp rates the interaction as moderate. Doxylamine and Risperidone 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 is a strongly sedating antihistamine, and combined use with risperidone can cause marked drowsiness and impaired alertness. Additive anticholinergic effects may also lead to confusion and constipation, particularly in older adults.
How serious is the interaction between Doxylamine and Risperidone?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise avoiding driving, alcohol and other sedatives. Consider non-pharmacological sleep measures or a non-sedating alternative.
What other medicines interact with Risperidone?
MediHelp also lists interactions of Risperidone with, for example, Ibutilide, Vandetanib, Adagrasib. The full list is on the Risperidone page.
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