Difflam Oral Rinse Difflam Oral Rinse treats many painful conditions of the mouth or throat including mouth ulcers, sore throats & discomfort associated with dentures or dental work. The active ingredient, Benzydamine Hydrochloride, belongs to a group of medicines called non-steroidal anti-inflammatory drugs (NSAIDs) & works by stopping pain & inflammation. Difflam Oral Rinse is supplied with a 20ml graduated plastic measuring cup for easy & accurate dosing.