Drug interactions
Hyoscyamine spray + Thioridazine
Severity: Moderate
Hyoscyamine spray 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
Hyoscyamine oral spray is absorbed through the oral mucosa and gastrointestinal tract, so it has systemic antimuscarinic effects that add to thioridazine's. This can cause confusion, dry mouth, urinary retention and constipation.
What this interaction means in plain words
Hyoscyamine spray 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.
Why it happens
Additive antimuscarinic effects through pharmacodynamic synergism.
What to do
Monitor for anticholinergic effects and use the lowest effective hyoscyamine dose; reduce or stop one agent if symptoms develop.
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
Frequently asked questions
Can I take Hyoscyamine spray with Thioridazine?
MediHelp rates the interaction as moderate. Hyoscyamine spray 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. Hyoscyamine oral spray is absorbed through the oral mucosa and gastrointestinal tract, so it has systemic antimuscarinic effects that add to thioridazine's. This can cause confusion, dry mouth, urinary retention and constipation.
How serious is the interaction between Hyoscyamine spray 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 effects and use the lowest effective hyoscyamine dose; reduce or stop one agent if symptoms develop.
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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