Drug interactions
Belzutifan + Chlorpheniramine
Severity: Minor
Belzutifan and Chlorpheniramine: minor 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
Belzutifan is a CYP3A4 inducer and may lower exposure to CYP3A4 substrates. Chlorpheniramine effect could be reduced, though the clinical consequence is likely small.
What this interaction means in plain words
Belzutifan and Chlorpheniramine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Belzutifan belongs to Miscellaneous; Chlorpheniramine belongs to Respiratory.
Why it happens
Belzutifan induction of CYP3A4 increases chlorpheniramine metabolism.
What to do
Monitor for reduced antihistamine effect and increase the chlorpheniramine dose only if symptom control is inadequate.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Chlorpheniramine
Other interactions of Belzutifan
Frequently asked questions
Can I take Belzutifan with Chlorpheniramine?
MediHelp rates the interaction as minor. Belzutifan and Chlorpheniramine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Belzutifan is a CYP3A4 inducer and may lower exposure to CYP3A4 substrates. Chlorpheniramine effect could be reduced, though the clinical consequence is likely small.
How serious is the interaction between Belzutifan and Chlorpheniramine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for reduced antihistamine effect and increase the chlorpheniramine dose only if symptom control is inadequate.
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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