No. You absolutely positively cannot take both NyQuil and Excedrin of any kind together. They both contain high levels of acetaminophen, which, if overdosed on, could hospitalize you. Excedrin also has aspirin. Whether or not you can take them over so many hours apart, however, is a question to ask.
Yes as long as you can safely take aspirin, you can safely take Excedrine.
its not true that's dangerous mixing medicines don't do it
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Liquid
yes oxy contains at least one of the ingredients of excedrine
no
Yes, to great effect.