Delsym has a different type of Dextromethorphan.. this is taken from www.dextroverse.org, a very reputable site for recreational and spiritual DXM use.

Dextromethorphan Polistirex: This is another form of DXM that is time-released. It basically has a edible plastic around some of the DXM. This is used in some cough medicines, so when some of the DXM has worn off, then some more will kick in. This is usually not the preferred type of DXM to use recreationally, because it usually takes longer for it to kick in, and it sometimes is not as strong.

I would recommend that if you want to trip on DXM, use something that has only dextromethorphan hydrobromide:This is what you get when you react DXM with hydrobromic acid. This is what is most commonly used for cough suppressants and for recreational use. This produces different effects on different doses. We refer to them as plateaus, and there are 4 of them.

BUT: DO NOT USE CORICIDIN COUGH & COLD TO TRIP ON DXM. IT HAS BEEN SHOWN TO LEAD TO MANY DEATHS.

I would recommend using Robotussin maximum strength, and if you can't really stand the idea of chugging a whole bottle of cough syrup (same with me.. I can't stand that shit) you can get gelcaps. Robotussin makes them, and "Dex-alone" is another very reputable source of DXM.

I hope this helps.