Drug interactions
Homatropine + Scopolamine
Severity: Moderate
Homatropine and Scopolamine: 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 and combining it with scopolamine produces additive anticholinergic effects. This can lead to dry mouth, blurred vision, constipation, urinary retention, tachycardia and confusion.
What this interaction means in plain words
Homatropine and Scopolamine 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; Scopolamine belongs to Respiratory.
Why it happens
Additive antimuscarinic effects.
What to do
Avoid duplicate anticholinergic therapy where possible, and monitor for anticholinergic toxicity, particularly in elderly patients.
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 Scopolamine
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 Scopolamine?
MediHelp rates the interaction as moderate. Homatropine and Scopolamine 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 and combining it with scopolamine produces additive anticholinergic effects. This can lead to dry mouth, blurred vision, constipation, urinary retention, tachycardia and confusion.
How serious is the interaction between Homatropine and Scopolamine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid duplicate anticholinergic therapy where possible, and monitor for anticholinergic toxicity, particularly in elderly patients.
What other medicines interact with Scopolamine?
MediHelp also lists interactions of Scopolamine with, for example, Benzhydrocodone / acetaminophen, Buprenorphine long-acting, Buprenorphine subdermal implant. The full list is on the Scopolamine page.
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