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I assume you mean Mucinex. But what is Threefold?
The request for a phone call was from someone else.
Thanks for the clarification. There are various formulations of these brands of cough, cold, and flu over-the-counter medications. Be sure to check that the same ingredient doesn't appear on both labels. For instance some formulations of both contain dextromethorphan. You wouldn't want to take those together.