Drug interactions
Carbidopa-levodopa + Olopatadine intranasal
Severity: Moderate
Carbidopa-levodopa and Olopatadine intranasal: 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
Both agents can cause somnolence, and intranasal olopatadine is a sedating antihistamine with some systemic absorption. Together they may add to drowsiness and impair psychomotor performance. Levodopa can also cause sudden sleep onset.
What this interaction means in plain words
Carbidopa-levodopa and Olopatadine intranasal 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
Additive central nervous system depressant effects.
What to do
Counsel patients about drowsiness and driving or machinery use. Consider a non-sedating nasal alternative such as a corticosteroid spray if sedation occurs.
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-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
Frequently asked questions
Can I take Carbidopa-levodopa with Olopatadine intranasal?
MediHelp rates the interaction as moderate. Carbidopa-levodopa and Olopatadine intranasal 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. Both agents can cause somnolence, and intranasal olopatadine is a sedating antihistamine with some systemic absorption. Together they may add to drowsiness and impair psychomotor performance. Levodopa can also cause sudden sleep onset.
How serious is the interaction between Carbidopa-levodopa and Olopatadine intranasal?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Counsel patients about drowsiness and driving or machinery use. Consider a non-sedating nasal alternative such as a corticosteroid spray if sedation occurs.
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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