Drug interactions
Clozapine + Glycopyrrolate
Severity: Moderate
Clozapine and Glycopyrrolate: 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
Clozapine has substantial anticholinergic activity, and glycopyrrolate adds peripheral anticholinergic effects. The combination can worsen constipation, potentially leading to ileus or bowel obstruction, and can cause urinary retention, dry mouth and tachycardia.
What this interaction means in plain words
Clozapine and Glycopyrrolate 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.
Clozapine belongs to Central Nervous System; Glycopyrrolate belongs to Respiratory.
Why it happens
Additive antimuscarinic effects on gastrointestinal and other smooth muscle and glandular tissue.
What to do
Monitor bowel function and urinary symptoms and use a bowel regimen as needed. Use the lowest effective glycopyrrolate dose and stop it if signs of obstruction 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 Clozapine
- Clozapine + Deferiprone Contraindicated
- Clozapine + Irinotecan Contraindicated
- Clozapine + Pimozide Contraindicated
- Clozapine + Thioridazine Contraindicated
- Acalabrutinib + Clozapine Major
- Adagrasib + Clozapine Major
Other interactions of Glycopyrrolate
- Glycopyrrolate + Potassium chloride Major
- Amitriptyline + Glycopyrrolate Moderate
- Atropine + Glycopyrrolate Moderate
- Bethanechol + Glycopyrrolate Moderate
- Chlorpromazine + Glycopyrrolate Moderate
- Clomipramine + Glycopyrrolate Moderate
Frequently asked questions
Can I take Clozapine with Glycopyrrolate?
MediHelp rates the interaction as moderate. Clozapine and Glycopyrrolate 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. Clozapine has substantial anticholinergic activity, and glycopyrrolate adds peripheral anticholinergic effects. The combination can worsen constipation, potentially leading to ileus or bowel obstruction, and can cause urinary retention, dry mouth and tachycardia.
How serious is the interaction between Clozapine and Glycopyrrolate?
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 bowel function and urinary symptoms and use a bowel regimen as needed. Use the lowest effective glycopyrrolate dose and stop it if signs of obstruction develop.
What other medicines interact with Clozapine?
MediHelp also lists interactions of Clozapine with, for example, Deferiprone, Irinotecan, Pimozide. The full list is on the Clozapine page.
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