Difflam 3mg Lozenges Eucalyptus Flavour provide relief and work to reduce the effects of a sore throat. The active ingredient, benzydamine hydrochloride helps to reduce inflammation and pain in the throat. Pack contains 20 Lozenges. Difflam 3mg Lozenges Eucalyptus Flavour are a treatment that works to reduce the effects of a sore throat. The lozenges work thanks to the active ingredient in them, benzydamine hydrochloride. Benzydamine is part of a group of drugs known as Non-Steroidal Anti-Inflammatory Drugs, which help to reduce inflammation and pain in the throat. Use these lozenges to treat mouth and throat irritation and inflammation.