Each of the major cold medicine brands sells a variety ... to the other Sinus-Max product—takes out a cough-related ingredient and swaps in some acetaminophen (that's Tylenol).

If you give your kid Tylenol and then measure out a cough syrup that includes acetaminophen, you may not realize you’ve doubled up on the same medication. Cold medicines may not always help ...

And always review proper dosing guidelines on the medicine container. Also, be aware that acetaminophen is often found in other medications, such as over-the-counter cold, cough, and flu medications.