What are the possible side effects of codeine and guaifenesin?

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

Stop taking this medication and call your doctor at once if you have any of these serious side effects:

• severe dizziness or drowsiness;
• confusion, hallucinations, unusual thoughts or behavior;
• urinating less than usual or not at all; or
• slow heart rate, weak pulse, fainting, weak or shallow breathing.

Less serious side effects include:

• dizziness, drowsiness,...

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What are the precautions when taking guaifenesin and codeine (Robitussin Ac)?

Before taking this medication, tell your doctor or pharmacist if you are allergic to any of its ingredients; or to narcotic pain relievers (e.g., morphine); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: abdominal problems (e.g., chronic constipation, ileus, pancreatitis), adrenal gland problem (e.g., Addison's disease), brain disorders (e.g., seizures, head injury, tumor, increased intracranial pressure), breathing problems (e.g., asthma, emphysema), heart problems (e.g., irregular heartbeat), kidney disease, liver disease, mental/mood disorders (e.g.,...

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