Chlorpheniramine / Pseudoephedrine Side Effects
Medically reviewed by Drugs.com. Last updated on Jan 1, 2024.
Applies to chlorpheniramine / pseudoephedrine: oral liquid, oral suspension extended release, oral tablet, oral tablet chewable.
Important warnings
This medicine can cause some serious health issues
Do not use this medicine if you have used an MAO inhibitor in the past 14 days, such as isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, or tranylcypromine.
You should not use antihistamine medication to make a child sleepy.
Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop using this medicine and call your doctor at once if you have:
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chest pain, rapid pulse, fast or uneven heart rate;
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confusion, hallucinations, severe nervousness;
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tremor, seizure (convulsions);
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little or no urinating;
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easy bruising or bleeding, unusual weakness; or
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dangerously high blood pressure (severe headache, buzzing in your ears, anxiety, shortness of breath).
Side effects such as dry mouth, constipation, and confusion may be more likely in older adults.
Common side effects may include:
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dizziness, drowsiness, blurred vision;
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dry nose or mouth;
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nausea, stomach pain, constipation, loss of appetite;
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problems with memory or concentration; or
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feeling restless or excited (especially in children).
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.
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More about chlorpheniramine / pseudoephedrine
- Check interactions
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- Drug class: upper respiratory combinations
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Further information
Chlorpheniramine/pseudoephedrine side effects can vary depending on the individual. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Note: Medication side effects may be underreported. If you are experiencing side effects that are not listed, submit a report to the FDA by following this guide.