Drug interactions
Benztropine + Risperidone
Severity: Moderate
Benztropine 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
Benztropine is often given with risperidone to treat extrapyramidal symptoms, but their anticholinergic effects add together. This can cause dry mouth, constipation, urinary retention, blurred vision and confusion, especially in older patients.
What this interaction means in plain words
Benztropine 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.
Benztropine belongs to Central Nervous System; Risperidone belongs to Central Nervous System.
Why it happens
Additive anticholinergic pharmacodynamic effects.
What to do
Use the lowest effective benztropine dose and review the need for it regularly. Monitor for confusion, constipation 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 Risperidone
- Ibutilide + Risperidone Contraindicated
- Risperidone + Vandetanib Contraindicated
- Adagrasib + Risperidone Major
- Amiodarone + Risperidone Major
- Amisulpride + Risperidone Major
- Amoxapine + Risperidone Major
Other interactions of Benztropine
- Benztropine + Memantine-donepezil Major
- Abobotulinumtoxina + Benztropine Moderate
- Amantadine + Benztropine Moderate
- Amitriptyline + Benztropine Moderate
- Amoxapine + Benztropine Moderate
- Atropine iv / + Benztropine Moderate
Frequently asked questions
Can I take Benztropine with Risperidone?
MediHelp rates the interaction as moderate. Benztropine 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. Benztropine is often given with risperidone to treat extrapyramidal symptoms, but their anticholinergic effects add together. This can cause dry mouth, constipation, urinary retention, blurred vision and confusion, especially in older patients.
How serious is the interaction between Benztropine 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: Use the lowest effective benztropine dose and review the need for it regularly. Monitor for confusion, constipation and urinary retention.
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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