Drug interactions
Homatropine + Olanzapine
Severity: Moderate
Homatropine and Olanzapine: 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
Homatropine is an antimuscarinic that can add to olanzapine's anticholinergic effects when absorbed systemically, for example from oral cough preparations. This may cause dry mouth, constipation, urinary retention and confusion.
What this interaction means in plain words
Homatropine and Olanzapine 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.
Homatropine belongs to Genitourinary; Olanzapine belongs to Central Nervous System.
Why it happens
Additive antimuscarinic pharmacodynamic effects.
What to do
Monitor for anticholinergic effects such as constipation, urinary retention and cognitive changes. Prefer an alternative product in elderly patients or those with glaucoma or prostatic hypertrophy.
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 Olanzapine
Other interactions of Homatropine
- Amantadine + Homatropine Moderate
- Amitriptyline + Homatropine Moderate
- Atropine + Homatropine Moderate
- Benztropine + Homatropine Moderate
- Bethanechol + Homatropine Moderate
- Chlorpromazine + Homatropine Moderate
Frequently asked questions
Can I take Homatropine with Olanzapine?
MediHelp rates the interaction as moderate. Homatropine and Olanzapine 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. Homatropine is an antimuscarinic that can add to olanzapine's anticholinergic effects when absorbed systemically, for example from oral cough preparations. This may cause dry mouth, constipation, urinary retention and confusion.
How serious is the interaction between Homatropine and Olanzapine?
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 such as constipation, urinary retention and cognitive changes. Prefer an alternative product in elderly patients or those with glaucoma or prostatic hypertrophy.
What other medicines interact with Olanzapine?
MediHelp also lists interactions of Olanzapine with, for example, Amisulpride, Amoxapine, Apomorphine. The full list is on the Olanzapine page.
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