Theraflu Flu & Chest Congestion Side Effects
Generic name: acetaminophen / guaifenesin
Note: This document provides detailed information about Theraflu Flu & Chest Congestion Side Effects associated with acetaminophen / guaifenesin. Some dosage forms listed on this page may not apply specifically to the brand name Theraflu Flu & Chest Congestion.
Applies to acetaminophen / guaifenesin: oral capsule, oral liquid, oral powder for reconstitution, oral tablet.
Important warnings
This medicine can cause some serious health issues
Ask a doctor before taking medicine that contains acetaminophen if you have ever had liver disease, or if you drink more than 3 alcoholic beverages per day.
Do not use cough or cold medicine if you have taken an MAO inhibitor in the past 14 days.
A dangerous drug interaction could occur.
MAO inhibitors include furazolidone, isocarboxazid, linezolid, phenelzine, rasagiline, selegiline, and tranylcypromine.
Do not take more of this medication than is recommended. An overdose of acetaminophen can damage your liver or cause death.
In rare cases, acetaminophen may cause a severe skin reaction. Stop taking this medicine and call your doctor right away if you have skin redness or a rash that spreads and causes blistering and peeling.
Ask a doctor or pharmacist before using any other cold, allergy, pain, or sleep medication. Acetaminophen (sometimes abbreviated as APAP) is contained in many combination medicines. Taking certain products together can cause you to get too much acetaminophen which can lead to a fatal overdose. Check the label to see if a medicine contains acetaminophen or APAP.
Avoid drinking alcohol. It may increase your risk of liver damage while taking acetaminophen.
Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
In rare cases, acetaminophen may cause a severe skin reaction that can be fatal. This could occur even if you have taken acetaminophen in the past and had no reaction. Stop taking this medicine and call your doctor right away if you have skin redness or a rash that spreads and causes blistering and peeling. If you have this type of reaction, you should never again take any medicine that contains acetaminophen.
Stop using the medicine and call your doctor at once if you have:
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mood changes, severe dizziness or anxiety, feeling like you might pass out;
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severe headache;
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fever; or
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nausea, upper stomach pain, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).
Common side effects may include:
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sleep problems (insomnia); or
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feeling nervous, restless, or anxious.
Less serious side effects are more likely, and you may have none at all.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.
See also:
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For healthcare professionals
Applies to acetaminophen/guaifenesin: oral capsule, oral liquid, oral powder for reconstitution, oral tablet.
General adverse events
The manufacturer has not provided adverse event information.[Ref]
References
1. The Buckley's Company (2019) Buckley's Complete + Mucus. https://www.buckleys.ca/products/syrups/complete-mucus-syrup/
More about Theraflu Flu & Chest Congestion (acetaminophen / guaifenesin)
- Check interactions
- Compare alternatives
- Dosage information
- During pregnancy
- Drug class: upper respiratory combinations
Related treatment guides
Further information
Theraflu Flu & Chest Congestion 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.