Guaifenesin comes under a group of medications called expectorant, and it relieves congestion formed in the chest caused due to cough. It works by thinning the mucus present in the airways, and so it relieves congestion created in the chest. Thereby, the breathing becomes easier. It is available as tablets, capsules, extended-release tablets, dissolving granules, and syrup. These are taken orally. In some cases, it causes some side effects, such as constipation, nausea, headache, drowsiness, and stomach cramps.
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