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Maxiphen CDX Side Effects

Generic Name: codeine / guaifenesin / phenylephrine

Note: This document contains side effect information about codeine / guaifenesin / phenylephrine. Some of the dosage forms listed on this page may not apply to the brand name Maxiphen CDX.

Applies to codeine / guaifenesin / phenylephrine: oral tablet

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Get emergency medical help if a child taking this medicine has breathing problems, blue lips, or severe drowsiness, or if you cannot wake the child up from sleep.

Stop taking this medicine and call your doctor at once if you have:

  • noisy breathing, sighing, shallow breathing;

  • severe drowsiness, hallucinations;

  • fast, slow, or uneven heart rate;

  • a seizure;

  • nervousness, tremors; or

  • little or no urination.

Serious side effects may be more likely in older adults and those who are overweight, malnourished, or debilitated.

Common side effects may include:

  • dizziness, drowsiness, weakness;

  • headache;

  • nausea;

  • sleep problems (insomnia); or

  • feeling nervous, anxious, or restless.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

Some side effects of Maxiphen CDX may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.

More about Maxiphen CDX (codeine / guaifenesin / phenylephrine)

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