Drug interactions
Carbidopa-levodopa + Tiotropium
Severity: Minor
Carbidopa-levodopa and Tiotropium: 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
Anticholinergics can add to levodopa's effect on parkinsonian symptoms, but at high doses may slow gastric emptying and reduce levodopa absorption. Inhaled tiotropium has low systemic exposure, so the effect is expected to be small.
What this interaction means in plain words
Carbidopa-levodopa and Tiotropium 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-levodopa belongs to Central Nervous System; Tiotropium belongs to Respiratory.
Why it happens
Anticholinergic slowing of gastrointestinal motility may delay levodopa absorption, while central anticholinergic activity may add to antiparkinsonian effect.
What to do
No routine action is needed; watch for changes in motor control or anticholinergic effects such as constipation or urinary retention.
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-levodopa
- Carbidopa-levodopa + Isocarboxazid Contraindicated
- Carbidopa-levodopa + Phenelzine Contraindicated
- Carbidopa-levodopa + Selegiline transdermal Contraindicated
- Carbidopa-levodopa + Tranylcypromine Contraindicated
- Amisulpride + Carbidopa-levodopa Major
- Asenapine + Carbidopa-levodopa Major
Other interactions of Tiotropium
Frequently asked questions
Can I take Carbidopa-levodopa with Tiotropium?
MediHelp rates the interaction as minor. Carbidopa-levodopa and Tiotropium have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Anticholinergics can add to levodopa's effect on parkinsonian symptoms, but at high doses may slow gastric emptying and reduce levodopa absorption. Inhaled tiotropium has low systemic exposure, so the effect is expected to be small.
How serious is the interaction between Carbidopa-levodopa and Tiotropium?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No routine action is needed; watch for changes in motor control or anticholinergic effects such as constipation or urinary retention.
What other medicines interact with Carbidopa-levodopa?
MediHelp also lists interactions of Carbidopa-levodopa with, for example, Isocarboxazid, Phenelzine, Selegiline transdermal. The full list is on the Carbidopa-levodopa page.
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