• Guaifenesin is used to relieve symptoms of cough and mucus in the chest due to colds, flu, or hay fever in adults and children.

How should you take this medication?

• Take this medication by mouth with or without food, usually every 4 hours or as directed by your doctor.
   
• Drinking extra fluids while you are taking Guaifenesin is recommended. Fluids will help to break up mucus and clear congestion.
   
• Swallow Guaifenesin whole. Do not break, crush, or chew before swallowing.
   
• If you miss a dose of Guaifenesin and you are taking it regularly, take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule.

General Precautions with Guaifenesin

• Before taking guaifenesin, tell your doctor or pharmacist if you are allergic to it, or if you have any other allergies.
   
• Guaifenesin may cause dizziness. Do not drive, operate machinery, or do anything else that could be dangerous until you know how you react to Guaifenesin.
   
• Before using this medication, tell your doctor or pharmacist your medical history, especially of: breathing problems, cough with large amounts of phlegm.
   
• Tell your doctor or pharmacist if you are pregnant, plan to become pregnant, or are breast-feeding.

What are the possible side effects of Guaifenesin?

• Side effects from this medication are unlikely. Seek medical attention right away if any of these severe side effects occur: Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue).
   
• Check with your doctor if any of the following side effects continue or are bothersome: Diarrhea, dizziness, headache, nausea, skin rash, stomach pain.