Drug interactions
Diphenoxylate-atropine + Levodopa
Severity: Minor
Diphenoxylate-atropine and Levodopa: 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
Atropine can slow gastric emptying, which may delay levodopa absorption and blunt its effect. Anticholinergics may also worsen dyskinesias or cause confusion in patients with Parkinson disease. The low atropine dose in diphenoxylate-atropine makes this usually minor.
What this interaction means in plain words
Diphenoxylate-atropine and Levodopa have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Diphenoxylate-atropine belongs to Gastrointestinal Tract; Levodopa belongs to Central Nervous System.
Why it happens
Delayed gastric emptying from anticholinergic activity reduces levodopa absorption, plus pharmacodynamic anticholinergic effects.
What to do
Monitor for reduced levodopa response and anticholinergic effects such as confusion or constipation; limit duration of diphenoxylate-atropine.
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 Diphenoxylate-atropine
- Diphenoxylate-atropine + Isocarboxazid Contraindicated
- Diphenoxylate-atropine + Phenelzine Contraindicated
- Diphenoxylate-atropine + Tranylcypromine Contraindicated
- Alfentanil + Diphenoxylate-atropine Major
- Alvimopan + Diphenoxylate-atropine Major
- Amitriptyline + Diphenoxylate-atropine Major
Other interactions of Levodopa
- Isocarboxazid + Levodopa Contraindicated
- Levodopa + Phenelzine Contraindicated
- Levodopa + Phenelzine (nonselective MAOI) Contraindicated
- Levodopa + Procarbazine Contraindicated
- Levodopa + Tranylcypromine Contraindicated
- Amisulpride + Levodopa Major
Frequently asked questions
Can I take Diphenoxylate-atropine with Levodopa?
MediHelp rates the interaction as minor. Diphenoxylate-atropine and Levodopa have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Atropine can slow gastric emptying, which may delay levodopa absorption and blunt its effect. Anticholinergics may also worsen dyskinesias or cause confusion in patients with Parkinson disease. The low atropine dose in diphenoxylate-atropine makes this usually minor.
How serious is the interaction between Diphenoxylate-atropine and Levodopa?
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 for reduced levodopa response and anticholinergic effects such as confusion or constipation; limit duration of diphenoxylate-atropine.
What other medicines interact with Diphenoxylate-atropine?
MediHelp also lists interactions of Diphenoxylate-atropine with, for example, Isocarboxazid, Phenelzine, Tranylcypromine. The full list is on the Diphenoxylate-atropine page.
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