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How does one get pure DXM without additives OTC?

Only because you asked, these are available on Amazon Prime, USA made, and are well reviewed:

Freebase: https://www.amazon.com/RoboTablets-suppressant-Dextromethorp... (note: 130% HBr strength)

HBr Salt: https://www.amazon.com/RoboHBr-Cough-suppressant-Dextrometho...

Special note for anyone considering messing with the stuff: If you are on SSRIs or MAOIs, it can literally kill you, so be careful and do your homework.

"Del-sym" and store brand substitutes in US.

Delysm is Dextromethorphan Polistirex which is a time-release form of DXM. I don't think it lets you get the same peaks / thresholds as 'instant release' dextromethorphan.

Back in my day, all the kids were cold-water extracting their paracetemol/Tylenol out of the combo pain reliever + cough suppressant medications: https://en.wikipedia.org/wiki/Cold_water_extraction

You could probably still do that. Or claim an allergy to the additives in Delsym (a corn allergy is a good one because corn is in everything) and ask to get a pure dextromethorphan formulation from a compounding pharmacy.

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