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Hello,Thank you for your question.I am Dr Saha, I shall try my best to help you.
Mucinex can be taken as 1200-2400 mg in 24 hours.
Side effects are not very common.
But dizziness can occur from mucinex.
Sleep medication can also cause tiredness and dizziness.
There can be other causes too.
I would suggest to consult doctor for an evaluation.
I hope this information helps.If there’s anything else I can do, please let me know.If you are satisfied, please rate my answer as good or excellent.Regards.