Drug interactions
Benztropine + Thioridazine
Severity: Moderate
Benztropine and Thioridazine: 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 have strong anticholinergic activity, so combined use can cause cognitive impairment, urinary retention, constipation, dry mouth, blurred vision and hyperthermia. Older patients and those with glaucoma or prostatic enlargement are at greater risk.
What this interaction means in plain words
Benztropine and Thioridazine 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; Thioridazine belongs to Central Nervous System.
Why it happens
Additive antimuscarinic effects.
What to do
Use the lowest effective benztropine dose and review the need regularly, monitoring for peripheral and central anticholinergic toxicity.
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 Thioridazine
- Abiraterone + Thioridazine Contraindicated
- Adagrasib + Thioridazine Contraindicated
- Amiodarone + Thioridazine Contraindicated
- Amisulpride + Thioridazine Contraindicated
- Amitriptyline + Thioridazine Contraindicated
- Amoxapine + Thioridazine Contraindicated
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 Thioridazine?
MediHelp rates the interaction as moderate. Benztropine and Thioridazine 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 have strong anticholinergic activity, so combined use can cause cognitive impairment, urinary retention, constipation, dry mouth, blurred vision and hyperthermia. Older patients and those with glaucoma or prostatic enlargement are at greater risk.
How serious is the interaction between Benztropine and Thioridazine?
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 regularly, monitoring for peripheral and central anticholinergic toxicity.
What other medicines interact with Thioridazine?
MediHelp also lists interactions of Thioridazine with, for example, Abiraterone, Adagrasib, Amiodarone. The full list is on the Thioridazine page.
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