What are the possible side effects of codeine, guaifenesin, and pseudoephedrine?
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: • fast, pounding, or uneven heartbeat; • slow heart rate, weak pulse, fainting, weak or shallow breathing; • severe dizziness, anxiety, restless feeling, or nervousness, headache, tremors; • confusion, unusual thoughts or behavior; • seizure (convulsions); • urinating less than usual or not at all; or • increased blood pressure (severe headache, blurred vision, trouble concentrating, chest pain, numbness, seizure). Less serious side effects include: • dizziness or headache; • constipation; • nausea, vomiting, upset stomach, loss of appetite; • feeling excited or restless; • sleep problems (insomnia); • increased sweating; • warmth, tingling, or redness under your skin; or • mild skin rash or itching. This is not a complete lis
