I pulled this from bb.com. I guess it differs from person to person, but Ive read where a few people were having issues with it-
"Guaifenesin" is a systemic expectorant, which means it has properties that will loosen and thin mucus.... As with all medicines, even OTC ones, there are possible side effects from using guaifenesin, including:
Diarrhea, dizziness, headache, hives, nausea or vomiting, skin rash ,stomach pain
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