When can I take nyquil cough medicine?

iLoveYou105

New member
I took one mucinex pill today at around 1 pm and it says to take every 12 hours. It hasn't passed 12 hours yet but the medicine's really not working. I just bought some nyquil cough syrup. If I take it, would that be bad? Would it be an overdose or something?
 
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