I've heard of it associated with MS. I found this article about it.....
http://www.healthcentral.com/multipl.../81066/crying/
"Avanir pharmaceuticals is looking into further studies of a medication called Zenvia, which is taken orally. This medication consists of a combination of dextromethorphan and quinidine. The FDA is requiring more studies be done before they would approve this drug in the United States."
Dextromethorphan is used in cough medicine...is it not?