Drug interactions
Clemastine + Olopatadine intranasal
Severity: Moderate
Clemastine 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 are H1 antihistamines, and clemastine is notably sedating. Combined use may increase drowsiness and impair psychomotor performance.
What this interaction means in plain words
Clemastine 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 CNS depression through H1-receptor antagonism.
What to do
Avoid duplicate antihistamine therapy. If both are needed, advise against driving and hazardous tasks.
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 Clemastine
Frequently asked questions
Can I take Clemastine with Olopatadine intranasal?
MediHelp rates the interaction as moderate. Clemastine 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 are H1 antihistamines, and clemastine is notably sedating. Combined use may increase drowsiness and impair psychomotor performance.
How serious is the interaction between Clemastine 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: Avoid duplicate antihistamine therapy. If both are needed, advise against driving and hazardous tasks.
What other medicines interact with Clemastine?
MediHelp also lists interactions of Clemastine with, for example, Alfentanil, Benzhydrocodone / acetaminophen, Buprenorphine buccal. The full list is on the Clemastine page.
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