Drug interactions
Benztropine + Olanzapine / samidorphan
Severity: Moderate
Benztropine and Olanzapine / samidorphan: 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
Olanzapine has anticholinergic properties, and adding benztropine increases the risk of constipation, urinary retention, tachycardia and confusion. Severe gastrointestinal hypomotility, including ileus, is a particular concern.
What this interaction means in plain words
Benztropine and Olanzapine / samidorphan 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.
Why it happens
Additive antimuscarinic effects reduce gastrointestinal and urinary tract motility.
What to do
Monitor bowel function and urinary symptoms, and review whether benztropine is still needed. Treat constipation early and reduce anticholinergic exposure if it develops.
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 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 Olanzapine / samidorphan?
MediHelp rates the interaction as moderate. Benztropine and Olanzapine / samidorphan 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. Olanzapine has anticholinergic properties, and adding benztropine increases the risk of constipation, urinary retention, tachycardia and confusion. Severe gastrointestinal hypomotility, including ileus, is a particular concern.
How serious is the interaction between Benztropine and Olanzapine / samidorphan?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor bowel function and urinary symptoms, and review whether benztropine is still needed. Treat constipation early and reduce anticholinergic exposure if it develops.
What other medicines interact with Benztropine?
MediHelp also lists interactions of Benztropine with, for example, Memantine-donepezil, Abobotulinumtoxina, Amantadine. The full list is on the Benztropine page.
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