Drug interactions
Benztropine + Protriptyline
Severity: Moderate
Benztropine and Protriptyline: 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
Protriptyline is a tricyclic antidepressant with significant antimuscarinic effects. With benztropine, the risk increases for urinary retention, constipation, tachycardia, delirium and angle-closure glaucoma, and for paralytic ileus in severe cases.
What this interaction means in plain words
Benztropine and Protriptyline 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 muscarinic receptor blockade.
What to do
Monitor for anticholinergic toxicity, particularly in older adults, and use the lowest doses. Consider a less anticholinergic antidepressant if toxicity occurs.
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 Protriptyline?
MediHelp rates the interaction as moderate. Benztropine and Protriptyline 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. Protriptyline is a tricyclic antidepressant with significant antimuscarinic effects. With benztropine, the risk increases for urinary retention, constipation, tachycardia, delirium and angle-closure glaucoma, and for paralytic ileus in severe cases.
How serious is the interaction between Benztropine and Protriptyline?
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 for anticholinergic toxicity, particularly in older adults, and use the lowest doses. Consider a less anticholinergic antidepressant if toxicity occurs.
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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