Is the white side of Mucinex DM dextromethorphan?

Question

or is it a compound of dextromethorphan and guaifenisen thats just smaller because its immediate release. It looks to be about the right ratio (1:20) to be the dextromethorphan.

Answer 1

Who cares?  Not only should you not make assumptions about the distribution of chemicals in a tablet, but it's not even worth your time to do anything about it.