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Gua C Oral

Generic Name: GUAIFENESIN/CODEINE - ORAL
Pronounced: (gweye-FEN-eh-sin/KO-deen)

Gua C Oral Side Effects

Drowsiness, dizziness, lightheadedness, facial flushing, nausea, vomiting, or constipation may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor immediately if any of these unlikely but serious side effects occur:

  • mental/mood changes (e.g., confusion, hallucinations)
  • fast/irregular heartbeat
  • slow/shallow breathing
  • trouble urinating


Seek immediate medical attention if this rare but very serious side effect occurs:

  • seizure


A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any of the following symptoms of a serious allergic reaction:

  • rash
  • itching/swelling (especially of the face/tongue/throat)
  • severe dizziness
  • trouble breathing


This is not a complete list of possible side effects. If you notice other side effects not listed above, contact your doctor or pharmacist.

Call your doctor for medical advice about side effects. In the US, you may report side effects to the Food and Drug Administration (FDA) at 1-800-FDA-1088.

In Canada, you may report side effects to Health Canada at 1-866-234-2345.

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