Drug interactions
Cyclobenzaprine + Homatropine
Severity: Moderate
Cyclobenzaprine and Homatropine: 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 agent, and cyclobenzaprine has significant anticholinergic properties. Together they may produce additive effects such as dry mouth, constipation, urinary retention, blurred vision, tachycardia and confusion.
What this interaction means in plain words
Cyclobenzaprine and Homatropine 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.
Cyclobenzaprine belongs to Musculoskeletal; Homatropine belongs to Genitourinary.
Why it happens
Additive muscarinic receptor antagonism.
What to do
Monitor for anticholinergic toxicity, particularly in older adults, and use the lowest effective doses. Avoid the combination in narrow-angle glaucoma or urinary obstruction.
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 Cyclobenzaprine
- Cyclobenzaprine + Isocarboxazid Contraindicated
- Cyclobenzaprine + Linezolid Contraindicated
- Cyclobenzaprine + Phenelzine Contraindicated
- Cyclobenzaprine + Safinamide Contraindicated
- Cyclobenzaprine + Selegiline Contraindicated
- Cyclobenzaprine + Selegiline transdermal Contraindicated
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 Cyclobenzaprine with Homatropine?
MediHelp rates the interaction as moderate. Cyclobenzaprine and Homatropine 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 agent, and cyclobenzaprine has significant anticholinergic properties. Together they may produce additive effects such as dry mouth, constipation, urinary retention, blurred vision, tachycardia and confusion.
How serious is the interaction between Cyclobenzaprine and Homatropine?
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, particularly in older adults, and use the lowest effective doses. Avoid the combination in narrow-angle glaucoma or urinary obstruction.
What other medicines interact with Cyclobenzaprine?
MediHelp also lists interactions of Cyclobenzaprine with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Cyclobenzaprine page.
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