Drug interactions
Amifampridine + Chlorpheniramine
Severity: Moderate
Amifampridine and Chlorpheniramine: 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
Amifampridine carries a dose-related risk of seizures, and sedating antihistamines such as chlorpheniramine may lower the seizure threshold. Concurrent use could increase seizure risk, particularly at higher doses or in susceptible patients.
What this interaction means in plain words
Amifampridine and Chlorpheniramine 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.
Amifampridine belongs to Central Nervous System; Chlorpheniramine belongs to Respiratory.
Why it happens
Additive pharmacodynamic lowering of the seizure threshold.
What to do
Prefer a non-sedating antihistamine where possible and monitor for seizure activity if both are used.
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
Other interactions of Amifampridine
- Amifampridine + Bupropion-naltrexone Major
- Amantadine + Amifampridine Moderate
- Amifampridine + Amitriptyline Moderate
- Amifampridine + Baclofen Moderate
- Amifampridine + Bethanechol Moderate
- Amifampridine + Bromocriptine Moderate
Frequently asked questions
Can I take Amifampridine with Chlorpheniramine?
MediHelp rates the interaction as moderate. Amifampridine and Chlorpheniramine 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. Amifampridine carries a dose-related risk of seizures, and sedating antihistamines such as chlorpheniramine may lower the seizure threshold. Concurrent use could increase seizure risk, particularly at higher doses or in susceptible patients.
How serious is the interaction between Amifampridine and Chlorpheniramine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Prefer a non-sedating antihistamine where possible and monitor for seizure activity if both are used.
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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