From page 9 I think, a post from RLSmi:
Quote:
I think the most important thing to look for in the DM-containing cough preparation is that it contain no additional active ingredient such as guafinesin or polistirex. Also, try to get a pediatric preparation with no more than 7.5 mg / 5 ml (5 ml is one tsp). This makes the small dose of 4-8 mg easier to measure. I prefer the "Simply Cough" which contains 5 mg / ml, but have not been able to find it recently.
The polystirex causes the DM to be slowly released over a period of several hours, and it is apparently important that the small dose "hit" the brain all at once in that critical time a couple of hours before the nightime sleep period when your body normally produces your natural endorphins. Polystirex will prevent this.
Guafinesin is a decongestant, but at the small amount taken probably has little or no effect.
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