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Thank you for the question.
An adult can take up to 2.4 gm of mucinex in a day. But not more than this. So, without any symptoms you should not be concerned about this. You have not take a toxic dose but a dose that can be taken rarely by a few patients when required.
You can take only Tylenol for the headache, and should avoid Tylenol sinus if it contains guaifenesin.
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