Thanks.
I went to a chain drug store and found nothing with noscapine. Behind the pharmacy counter, they never heard of it.
At the following link there is more information. What I would do is write down the ingredients on the cough syrup and then Goggle it to see if it has Noscapine in it.
http://en.wikipedia.org/wiki/Noscapine
Noscapine (also known as Narcotine or Anarcotine) is a benzylisoquinoline alkaloid from plants of the Papaveraceae family, without significant painkilling properties. This agent is primarily used for its antitussive (cough-suppressing) effects. It has also been shown to have anticancer activity
More at link.