Drug interactions
Dicyclomine + Thioridazine
Severity: Moderate
Dicyclomine 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 antimuscarinic activity, so combined use can intensify dry mouth, constipation, urinary retention, blurred vision, confusion and tachycardia. Reduced gut motility from dicyclomine may also alter oral absorption of thioridazine. Elderly patients are most vulnerable to central and peripheral anticholinergic toxicity.
What this interaction means in plain words
Dicyclomine 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.
Dicyclomine belongs to Respiratory; Thioridazine belongs to Central Nervous System.
Why it happens
Additive antimuscarinic pharmacodynamic effects, with possible slowed gastrointestinal transit altering thioridazine absorption.
What to do
Monitor for anticholinergic toxicity such as confusion, urinary retention and severe constipation, and reduce or stop dicyclomine if these occur. Avoid the combination in frail elderly patients where possible.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Dicyclomine and Thioridazine, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Dicyclomine
- Clozapine + Dicyclomine Major
- Dicyclomine + Henbane Major
- Dicyclomine + Imipramine Major
- Dicyclomine + Pramlintide Major
- Abobotulinumtoxina + Dicyclomine Moderate
- Aclidinium + Dicyclomine Moderate
Other interactions of Thioridazine
- Abiraterone + Thioridazine Contraindicated
- Adagrasib + Thioridazine Contraindicated
- Amiodarone + Thioridazine Contraindicated
- Amisulpride + Thioridazine Contraindicated
- Amitriptyline + Thioridazine Contraindicated
- Amoxapine + Thioridazine Contraindicated
Frequently asked questions
Can I take Dicyclomine with Thioridazine?
MediHelp rates the interaction as moderate. Dicyclomine 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 antimuscarinic activity, so combined use can intensify dry mouth, constipation, urinary retention, blurred vision, confusion and tachycardia. Reduced gut motility from dicyclomine may also alter oral absorption of thioridazine. Elderly patients are most vulnerable to central and peripheral anticholinergic toxicity.
How serious is the interaction between Dicyclomine 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: Monitor for anticholinergic toxicity such as confusion, urinary retention and severe constipation, and reduce or stop dicyclomine if these occur. Avoid the combination in frail elderly patients where possible.
What other medicines interact with Dicyclomine?
MediHelp also lists interactions of Dicyclomine with, for example, Clozapine, Henbane, Imipramine. The full list is on the Dicyclomine page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
