Drug interactions
Belladonna alkaloids + Carbidopa-entacapone-levodopa
Severity: Moderate
Belladonna alkaloids and Carbidopa-entacapone-levodopa: 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
Belladonna alkaloids slow gastric emptying, which may delay levodopa absorption and reduce its effect. They may also add to confusion, hallucinations and dyskinesia in older patients with Parkinson's disease.
What this interaction means in plain words
Belladonna alkaloids and Carbidopa-entacapone-levodopa 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.
Why it happens
Anticholinergic slowing of gastric motility delays levodopa absorption, with additive central anticholinergic effects.
What to do
Monitor motor response and for confusion or hallucinations, especially in older adults. Adjust the levodopa regimen if motor fluctuations occur or reduce the anticholinergic dose.
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 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
Frequently asked questions
Can I take Belladonna alkaloids with Carbidopa-entacapone-levodopa?
MediHelp rates the interaction as moderate. Belladonna alkaloids and Carbidopa-entacapone-levodopa 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. Belladonna alkaloids slow gastric emptying, which may delay levodopa absorption and reduce its effect. They may also add to confusion, hallucinations and dyskinesia in older patients with Parkinson's disease.
How serious is the interaction between Belladonna alkaloids and Carbidopa-entacapone-levodopa?
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 motor response and for confusion or hallucinations, especially in older adults. Adjust the levodopa regimen if motor fluctuations occur or reduce the anticholinergic dose.
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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