Phenflu CDX Side Effects
Generic name: acetaminophen / codeine / guaifenesin / phenylephrine
Note: This document contains side effect information about acetaminophen / codeine / guaifenesin / phenylephrine. Some of the dosage forms listed on this page may not apply to the brand name Phenflu CDX.
Some side effects of Phenflu CDX may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.
Applies to acetaminophen / codeine / guaifenesin / phenylephrine: oral tablet
Get emergency medical help if you have any of these signs of an allergic reaction while taking acetaminophen / codeine / guaifenesin / phenylephrine: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Seek emergency medical attention if a child taking this medication has any of the following life-threatening side effects: noisy breathing, sighing, slow breathing with long pauses between breaths; being unusually sleepy or hard to wake up; blue colored lips.
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 this medicine and call your doctor at once if you have:
confusion, mood changes, severe dizziness or anxiety, feeling like you might pass out;
sudden severe headache or vomiting, pain or numbness in the arms or legs;
tremor, seizure (convulsions);
nausea, pain in your upper stomach, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of your skin or eyes); or
dangerously high blood pressure (severe headache, blurred vision, buzzing in your ears, anxiety, chest pain, uneven heartbeats, seizure).
Common side effects may include:
dizziness, drowsiness, mild headache;
mild nausea, upset stomach, constipation;
feeling nervous, restless, or anxious; or
sleep problems (insomnia).
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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