Drug interactions
Amitriptyline + Benztropine
Severity: Moderate
Amitriptyline and Benztropine: 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 drugs are strongly anticholinergic, so combined use can cause marked dry mouth, constipation, urinary retention, blurred vision, confusion and tachycardia. Elderly patients are at risk of delirium, paralytic ileus and heat intolerance.
What this interaction means in plain words
Amitriptyline and Benztropine 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.
Amitriptyline belongs to Central Nervous System; Benztropine belongs to Central Nervous System.
Why it happens
Additive blockade of muscarinic acetylcholine receptors.
What to do
Monitor for anticholinergic toxicity, especially cognitive effects, urinary retention and constipation. Use the lowest effective doses and review whether benztropine is still needed.
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 Amitriptyline
- Amitriptyline + Isocarboxazid Contraindicated
- Amitriptyline + Methylene blue Contraindicated
- Amitriptyline + Phenelzine Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amitriptyline + Procarbazine Contraindicated
- Amitriptyline + Safinamide Contraindicated
Other interactions of Benztropine
- Benztropine + Memantine-donepezil Major
- Abobotulinumtoxina + Benztropine Moderate
- Amantadine + Benztropine Moderate
- Amoxapine + Benztropine Moderate
- Atropine iv / + Benztropine Moderate
- Atropine + Benztropine Moderate
Frequently asked questions
Can I take Amitriptyline with Benztropine?
MediHelp rates the interaction as moderate. Amitriptyline and Benztropine 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 drugs are strongly anticholinergic, so combined use can cause marked dry mouth, constipation, urinary retention, blurred vision, confusion and tachycardia. Elderly patients are at risk of delirium, paralytic ileus and heat intolerance.
How serious is the interaction between Amitriptyline and Benztropine?
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, especially cognitive effects, urinary retention and constipation. Use the lowest effective doses and review whether benztropine is still needed.
What other medicines interact with Amitriptyline?
MediHelp also lists interactions of Amitriptyline with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Amitriptyline page.
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