Safety & Efficacy Study of Benzydamine Oral Rinse for the Treatment of Oral Mucositis (Mouth Sores) Resulting From Radiation Therapy for Cancer of the Oral Cavity, Oropharynx, or Nasopharynx

Inclusion Criteria:

* Karnofsky performance scale \>= 60%
* Diagnosis of pathologically confirmed malignancy involving one or more of the following sites: oral cavity, oropharynx extending down to the level of the supraglottic area, nasopharynx, maxillary sinus and parotid gland
* high risk for developing oral and/or oropharyngeal mucositis due to radiation to head and neck areas
* scheduled to receive a continuous course (eg, often six to eight weeks) of conventional or hyperfractionated external beam radiation for cancer of the head and neck region (subjects who had surgery prior to radiation are eligible) with or without concomitant chemotherapy
* at least two oral tissue sites (not including areas of previous lesions, tumor, surgical resection, or the lips) must be included in the RT treatment volume and planned to receive a total radiation dose of 5500 cGy or higher, given in a single daily fraction of 180 to 220 cGy or twice daily fractions of 110 to 150 cGy

Exclusion Criteria:

* Known hypersensitivity to benzydamine HCl and/or any of the other components including alcohol, menthol, glycerin, flavoring agents, and preservatives
* oral or oropharyngeal mucositis present at the time of entry into the study
* treatment regimen consisting of noncontinuous radiation therapy
* received chemotherapy within 21 days of entry into the study as defined by initiation of radiation
* scheduled to receive or have received brachytherapy
* chronically being medicated for conditions other than tumor-related pain with oral and/or parenteral prescription steroids or analgesics
* use of chlorhexidine gluconate (Peridex), amifostine (Ethyol), topical antibiotics to the mouth (ie, tetracycline), topical steroids to the mouth, povidone iodine rinses, glutamine oral rinses, selective decontamination, and Granulocyte Macrophage-Colony Stimulating Factor (GM-CSF)
* use of mouthwash containing other exclusionary medications and any other medication(s) without an approved indication for topical oral use with the exception of liquid antacid formulations (eg, Maalox, Mylanta)
* participated in an investigational study within 30 days prior to enrolling into the study where an experimental drug and/or product was taken
* not willing and/or able to take opioids for any reason
* cryotherapy (ie, ice chips or popsicles) prior to or during chemotherapy infusion