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An Introduction to Uses for Guaifenesin. Guaifenesin is best used to help relieve chest congestion; it is not an ideal medication for relieving a dry, hacking cough, since it does not suppress coughing.
They also can cause dry mouth, dizziness, and headache. You can also thin out the mucus with guaifenesin, a type of medicine called an expectorant. Thinner mucus is easier to get out of the body. Possible side effects of guaifenesin are dizziness, headache, nausea, and vomiting.