Drug interactions
Chlorpheniramine + Olopatadine intranasal
Severity: Moderate
Chlorpheniramine 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 drugs are antihistamines that can cause drowsiness, and intranasal olopatadine has some systemic absorption. Together they may increase sedation and impair psychomotor performance, including driving.
What this interaction means in plain words
Chlorpheniramine 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 where possible. If both are needed, warn the patient about daytime impairment and avoid driving or 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 Chlorpheniramine
Frequently asked questions
Can I take Chlorpheniramine with Olopatadine intranasal?
MediHelp rates the interaction as moderate. Chlorpheniramine 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 drugs are antihistamines that can cause drowsiness, and intranasal olopatadine has some systemic absorption. Together they may increase sedation and impair psychomotor performance, including driving.
How serious is the interaction between Chlorpheniramine 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 where possible. If both are needed, warn the patient about daytime impairment and avoid driving or hazardous tasks.
What other medicines interact with Chlorpheniramine?
MediHelp also lists interactions of Chlorpheniramine with, for example, Belladonna and opium, Benzhydrocodone / acetaminophen, Brexanolone. The full list is on the Chlorpheniramine page.
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