Drug interactions
Carbidopa-entacapone-levodopa + Propantheline
Severity: Moderate
Carbidopa-entacapone-levodopa and Propantheline: 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
Propantheline is an anticholinergic that slows gastric emptying, which may delay and reduce levodopa absorption. Anticholinergic effects such as confusion, hallucinations and dyskinesia may also add to dopaminergic adverse effects.
What this interaction means in plain words
Carbidopa-entacapone-levodopa and Propantheline 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
Delayed gastric emptying reducing levodopa absorption, plus additive central anticholinergic effects.
What to do
Monitor motor response and cognitive status, and adjust levodopa dosing if effect declines. Avoid in older patients with cognitive impairment.
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 Carbidopa-entacapone-levodopa with Propantheline?
MediHelp rates the interaction as moderate. Carbidopa-entacapone-levodopa and Propantheline 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. Propantheline is an anticholinergic that slows gastric emptying, which may delay and reduce levodopa absorption. Anticholinergic effects such as confusion, hallucinations and dyskinesia may also add to dopaminergic adverse effects.
How serious is the interaction between Carbidopa-entacapone-levodopa and Propantheline?
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 cognitive status, and adjust levodopa dosing if effect declines. Avoid in older patients with cognitive impairment.
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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