Take this medication by mouth with or without food, as directed by your doctor. If you are self-treating, follow all directions on the product package. To prevent trouble sleeping, do not take this medication close to bedtime. If you have any questions, ask your doctor or pharmacist.
If you are using the liquid form of this medication, carefully measure the dose using a special measuring device/spoon. Do not use a household spoon because you may not get the correct dose.
Guaifenesin may have a bitter taste. Swallow capsules and tablets whole. Some tablets may be split if they have a score line and your doctor or pharmacist tells you to do so. Chewable tablets may be swallowed whole or chewed.
Dosage is based on your age, medical condition, and response to treatment. Do not increase your dose or take this drug more often than directed.
Drink plenty of fluids while taking this medication. Fluids will help to break up mucus and clear congestion.
Caffeine can increase the side effects of this medication. Avoid drinking large amounts of beverages containing caffeine (coffee, tea, colas), eating large amounts of chocolate, or taking nonprescription products that contain caffeine.
Tell your doctor if your condition is accompanied by headache that doesn't go away, fever, severe sore throat, rash, or if it lasts, returns, or gets worse after 7 days. These may be signs of a serious medical problem. Get medical help right away if you think you may have a serious medical problem.