I took Robitussin for the thick saliva, which comes and goes. Dileep is right about visualization, it can work. I used it with a vengeance during my treatments and fared quite well with it.

Left tonsil SCC, HPV+. T2N0M0. Tonsillectomy 3-07, bilateral radiation, cisplatin 3x, Tx completed 6-06. Clear PET 4-01-2008.
Thyroidectomy 5-9-08, resulting in permanent surgically-induced hypoparathyroidism and adrenal problems. Bummer.