Drug interactions
Carbidopa-entacapone-levodopa + Homatropine
Severity: Minor
Carbidopa-entacapone-levodopa and Homatropine: minor 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, if given systemically, has anticholinergic activity that may delay gastric emptying and reduce levodopa absorption. It may also add to confusion and hallucinations in susceptible patients.
What this interaction means in plain words
Carbidopa-entacapone-levodopa and Homatropine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Carbidopa-entacapone-levodopa belongs to Central Nervous System; Homatropine belongs to Genitourinary.
Why it happens
Anticholinergic slowing of gastric motility delays levodopa absorption and adds central anticholinergic effects.
What to do
Monitor motor response and for confusion, particularly in older patients. Adjust the levodopa schedule if symptom control worsens.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Carbidopa-entacapone-levodopa
- Carbidopa-entacapone-levodopa + Isocarboxazid Contraindicated
- Carbidopa-entacapone-levodopa + Phenelzine Contraindicated
- Carbidopa-entacapone-levodopa + Selegiline transdermal Contraindicated
- Carbidopa-entacapone-levodopa + Tranylcypromine Contraindicated
- Amisulpride + Carbidopa-entacapone-levodopa Major
- Asenapine transdermal + Carbidopa-entacapone-levodopa Major
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 Carbidopa-entacapone-levodopa with Homatropine?
MediHelp rates the interaction as minor. Carbidopa-entacapone-levodopa and Homatropine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Homatropine, if given systemically, has anticholinergic activity that may delay gastric emptying and reduce levodopa absorption. It may also add to confusion and hallucinations in susceptible patients.
How serious is the interaction between Carbidopa-entacapone-levodopa and Homatropine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor motor response and for confusion, particularly in older patients. Adjust the levodopa schedule if symptom control worsens.
What other medicines interact with Carbidopa-entacapone-levodopa?
MediHelp also lists interactions of Carbidopa-entacapone-levodopa with, for example, Isocarboxazid, Phenelzine, Selegiline transdermal. The full list is on the Carbidopa-entacapone-levodopa page.
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