Gabapentin, Methadone, and Oxycodone With or Without Venlafaxine Hydrochloride in Managing Pain in Participants With Stage II-IV Squamous Cell Head and Neck Cancer Undergoing Chemoradiation Therapy

This trial studies how well gabapentin, methadone, and oxycodone with or without venlafaxine hydrochloride work in managing pain in participants with stage II-IV squamous cell head and neck cancer undergoing chemoradiation therapy. Gabapentin may reduce the need for these pain medications if given at the start of radiation therapy. Methadone and oxycodone may help relieve pain caused by cancer. Venlafaxine hydrochloride may prevent or improve pain caused by cancer. It is now yet known whether giving gabapentin, methadone, and oxycodone with venlafaxine hydrochloride will work better in managing pain in participants with squamous cell head and neck cancer undergoing chemoradiation therapy.