MAC dual action Blackcurrant Flavour Lozenges Pack of 16MAC dual action Blackcurrant flavour lozenges are recommended for sore throats & associated pain. The active ingredient Hexylresorcinol is an antiseptic which combats the bacteria that cause sore throats. It also acts as a local anaesthetic to bring soothing relief from pain & discomfort.MAC dual action Blackcurrant flavour lozenges are recommended for the relief of sore throats & associated pain. It also acts as a local anaesthetic to bring soothing relief from pain & discomfort.