Depends: If u overdose you'll often feel nauseated & vomit. Side-effects of medications r usually dose-dependent. But u could be taking the recommended dose or less & not tolerate the medication. There's scant evidence that most otc cold medications are effective at all. Im not a big fan of guaifenesin. It's purportedly a mucolytic but so is water. This may be a case where less is more.
Answered 10/16/2017
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