What are the possible side effects of acetaminophen, codeine, guaifenesin, and pseudoephedrine?
• fast, pounding, or uneven heartbeat; • slow heart rate, weak pulse, fainting, weak or shallow breathing; • confusion, hallucinations, unusual thoughts or behavior; • severe dizziness, anxiety, restless feeling, or nervousness; • urinating less than usual or not at all; • increased blood pressure (severe headache, blurred vision, trouble concentrating, chest pain, numbness, seizure); or • nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes). Less serious side effects may include: • dizziness, drowsiness, headache; • constipation; • mild nausea, vomiting, or stomach upset; • mild loss of appetite; • mild itching or skin rash; • warmth, tingling, or redness under your skin; • increased sweating; • feeling excited or restless; or • sleep problems (insomnia). This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.
