Can somebody please help me recall the name of the Medicine for saliva production?

My FIL has started having problems with eating dry food about 4 months post IMRT. If possible please provide generic name or link.

Thanks:-)

FIL completed treatment 10/08. CG to father in Law in india who had SCC oral tongue T2N2M0. FIL underwent surgery, neck dissection, IMRT, and erbitux without losing weight or getting nauseated. Completed October 2008. SO far so good.