Drug interactions
Olopatadine intranasal + Phenytoin
Severity: Moderate
Olopatadine intranasal and Phenytoin: 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
Intranasal olopatadine can cause somnolence and phenytoin can cause CNS depression, so additive sedation and psychomotor impairment may occur. The effect is usually modest at standard doses.
What this interaction means in plain words
Olopatadine intranasal and Phenytoin 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 CNS depressant effects.
What to do
Counsel patients to avoid driving or hazardous tasks until response is known, and avoid additional sedatives or alcohol.
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 Phenytoin
- Artemether / lumefantrine + Phenytoin Contraindicated
- Bictegravir + Phenytoin Contraindicated
- Cabotegravir + Phenytoin Contraindicated
- Doravirine + Phenytoin Contraindicated
- Elbasvir / grazoprevir + Phenytoin Contraindicated
- Elvitegravir / cobicistat / emtricitabine / tenofovir df + Phenytoin Contraindicated
Frequently asked questions
Can I take Olopatadine intranasal with Phenytoin?
MediHelp rates the interaction as moderate. Olopatadine intranasal and Phenytoin 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. Intranasal olopatadine can cause somnolence and phenytoin can cause CNS depression, so additive sedation and psychomotor impairment may occur. The effect is usually modest at standard doses.
How serious is the interaction between Olopatadine intranasal and Phenytoin?
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 to avoid driving or hazardous tasks until response is known, and avoid additional sedatives or alcohol.
What other medicines interact with Phenytoin?
MediHelp also lists interactions of Phenytoin with, for example, Artemether / lumefantrine, Bictegravir, Cabotegravir. The full list is on the Phenytoin page.
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