Strepsils Lozenges, your First Aid for sore throat. Powerful sore throat relief that lasts. Sore throats can be painful, irritating, and in need of fast relief. Nothing works better to relieve sore throat pain than Strepsils lozenges. Strepsils lozenges contain dual anti-bacterial action that provides instant and long lasting sore throat relief. Is throat pain sharper than normal? For sharper pain associated with a medium to more troublesome sore throat, Strepsils Blackcurrant Extra contains Hexylresorcinol, which has anaesthetic properties that numb throat pain.