You will want to be screened for long QT syndrome and avoid drugs which are additive with it. (like methadone and Elavil).

http://www.drugs.com/nuedexta.html

I've been on it for a couple of months and it's been pretty good. Not only does the quinidine sulfate completely block the metabolism of the dextromethorphan - so a little goes a long way - but it clearly potentates my Namenda (memantine HCl)) as well. That, and with any NDMA receptor antagonist, the dextromethorphan will also potentate opioids, at least to some extent. (See prior threads on dextromethorphan).

That said, mrsD is absolutely correct, no one should use the stuff if they have a "long Q - T interval." And although this is something that is more likely to be "honored in the breech," that means having a EKG first. No exceptions.

Mike