Dexchlorpheniramine and Isoniazid interaction
Dexchlorpheniramine and Isoniazid: the Dexchlorpheniramine prescribing label flags this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Dexchlorpheniramine (Corphena) label · effective 2025-12-22
Antihistamines are also contraindicated in the following conditions: Hypersensitivity to dexchlorpheniramine maleate or other antihistamines of similar chemical structure Monoamine oxidase inhibitor therapy (See Drug Interaction section)
Drug Interaction MAO inhibitors prolong and intensify the anticholinergic (drying) effects of antihistamines.
PRECAUTIONS CORPHENA Oral Solution has an atropine-like action and, therefore, should be used with caution in patients with: History of bronchial asthma Increased intraocular pressure Hyperthyroidism Cardiovascular disease Hypertension Drug Interaction MAO inhibitors prolong and intensify the anticholinergic (drying) effects of antihistamines.
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Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.